Upload folder using huggingface_hub

.dockerignore

@@ -0,0 +1,18 @@
+.env
+.venv
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.ipynb_checkpoints/
+.cache/
+.git/
+.gitignore
+wandb/
+nohup.out
+*.log
+data/
+local_data/
+trash/
+models/
+vibevoice-large/

.trussignore

@@ -0,0 +1,9 @@
+
+# Ignore large datasets
+data/
+data/**
+
+# Optional: local caches
+__pycache__/
+*.pyc
+.cache/

Dockerfile

@@ -0,0 +1,32 @@
+FROM nvidia/cuda:12.2.2-cudnn8-runtime-ubuntu22.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV PYTHONUNBUFFERED=1
+ENV PIP_NO_CACHE_DIR=1
+
+RUN apt-get update && apt-get install -y \
+    python3.10 \
+    python3.10-venv \
+    python3-pip \
+    git \
+    ffmpeg \
+    sox \
+    libsndfile1 \
+    libgl1 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN ln -sf /usr/bin/python3.10 /usr/bin/python
+RUN python -m pip install --upgrade pip setuptools wheel
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+RUN chmod +x training.sh
+
+CMD ["bash", "training.sh"]
+

config.py

@@ -0,0 +1,49 @@
+from truss_train import definitions
+from truss.base import truss_config
+
+# Base image
+BASE_IMAGE = "pytorch/pytorch:2.4.1-cuda12.1-cudnn9-runtime"
+
+# Runtime configuration
+training_runtime = definitions.Runtime(
+    start_commands=[
+        "chmod +x run.sh",
+        "./run.sh",
+    ],
+    environment_variables={
+        "HF_HOME": "/workspace/.cache/huggingface",
+        "TORCH_HOME": "/workspace/.cache/torch",
+        # Optional: only if using HF private models
+        # "HF_TOKEN": definitions.SecretReference(name="hf_access_token"),
+    },
+    # Truss 0.12 ONLY supports enabled=True (no paths)
+    cache_config=definitions.CacheConfig(
+        enabled=True,
+    ),
+    checkpointing_config=definitions.CheckpointingConfig(
+        enabled=True,
+    ),
+)
+
+# Compute configuration
+training_compute = definitions.Compute(
+    accelerator=truss_config.AcceleratorSpec(
+        accelerator=truss_config.Accelerator.H100,
+        count=1,
+    ),
+    cpu_count=16,
+)
+
+# Training job
+training_job = definitions.TrainingJob(
+    image=definitions.Image(base_image=BASE_IMAGE),
+    compute=training_compute,
+    runtime=training_runtime,
+)
+
+# Training project
+training_project = definitions.TrainingProject(
+    name="vibevoice-finetune",
+    job=training_job,
+)
+

diff_head_layers.txt

@@ -0,0 +1,26 @@
+[0] noisy_images_proj.weight (shape: (3584, 64), trainable: True)
+[1] cond_proj.weight (shape: (3584, 3584), trainable: True)
+[2] t_embedder.mlp.0.weight (shape: (3584, 256), trainable: True)
+[3] t_embedder.mlp.2.weight (shape: (3584, 3584), trainable: True)
+[4] layers.0.ffn.gate_proj.weight (shape: (10752, 3584), trainable: True)
+[5] layers.0.ffn.up_proj.weight (shape: (10752, 3584), trainable: True)
+[6] layers.0.ffn.down_proj.weight (shape: (3584, 10752), trainable: True)
+[7] layers.0.norm.weight (shape: (3584,), trainable: True)
+[8] layers.0.adaLN_modulation.1.weight (shape: (10752, 3584), trainable: True)
+[9] layers.1.ffn.gate_proj.weight (shape: (10752, 3584), trainable: True)
+[10] layers.1.ffn.up_proj.weight (shape: (10752, 3584), trainable: True)
+[11] layers.1.ffn.down_proj.weight (shape: (3584, 10752), trainable: True)
+[12] layers.1.norm.weight (shape: (3584,), trainable: True)
+[13] layers.1.adaLN_modulation.1.weight (shape: (10752, 3584), trainable: True)
+[14] layers.2.ffn.gate_proj.weight (shape: (10752, 3584), trainable: True)
+[15] layers.2.ffn.up_proj.weight (shape: (10752, 3584), trainable: True)
+[16] layers.2.ffn.down_proj.weight (shape: (3584, 10752), trainable: True)
+[17] layers.2.norm.weight (shape: (3584,), trainable: True)
+[18] layers.2.adaLN_modulation.1.weight (shape: (10752, 3584), trainable: True)
+[19] layers.3.ffn.gate_proj.weight (shape: (10752, 3584), trainable: True)
+[20] layers.3.ffn.up_proj.weight (shape: (10752, 3584), trainable: True)
+[21] layers.3.ffn.down_proj.weight (shape: (3584, 10752), trainable: True)
+[22] layers.3.norm.weight (shape: (3584,), trainable: True)
+[23] layers.3.adaLN_modulation.1.weight (shape: (10752, 3584), trainable: True)
+[24] final_layer.linear.weight (shape: (64, 3584), trainable: True)
+[25] final_layer.adaLN_modulation.1.weight (shape: (7168, 3584), trainable: True)

finalize_indian_english.py

@@ -0,0 +1,8 @@
+from datasets import load_dataset
+
+ds = load_dataset("hf_indian_english_raw", split="train")
+print("Loaded:", len(ds))
+
+ds.save_to_disk("local_eng")
+print("Saved to local_eng")
+

merge_dataset.py

@@ -0,0 +1,133 @@
+from datasets import load_dataset, concatenate_datasets, Audio
+from glob import glob
+from datasets import load_from_disk
+
+MAX_ROWS = 6000
+FINAL = []
+
+
+# -------------------------------------------------
+# Helper
+# -------------------------------------------------
+def load_local_parquet(path, text_col="transcription", filter_fn=None):
+    print(f"\n📌 Loading: {path}")
+    files = sorted(glob(path, recursive=True))
+    assert files, f"No parquet files found in {path}"
+
+    ds = load_dataset(
+        "parquet",
+        data_files=files,
+        split="train"
+    )
+
+    if filter_fn:
+        ds = ds.filter(filter_fn)
+
+    if text_col != "text":
+        ds = ds.rename_column(text_col, "text")
+
+    # 🔥 KEEP ONLY audio + text
+    ds = ds.select_columns(["audio", "text"])
+
+    ds = ds.cast_column("audio", Audio(sampling_rate=24000))
+
+    if len(ds) > MAX_ROWS:
+        ds = ds.shuffle(seed=42).select(range(MAX_ROWS))
+
+    print(f"✅ Rows used: {len(ds)} | Columns: {ds.column_names}")
+    return ds
+def load_arrow_dataset(path, text_col="transcription"):
+    print(f"\n📌 Loading Arrow dataset: {path}")
+
+    ds = load_from_disk(path)
+
+    if text_col != "text":
+        ds = ds.rename_column(text_col, "text")
+
+    # 🔥 KEEP ONLY audio + text
+    ds = ds.select_columns(["audio", "text"])
+
+    ds = ds.cast_column("audio", Audio(sampling_rate=24000))
+
+    if len(ds) > MAX_ROWS:
+        ds = ds.shuffle(seed=42).select(range(MAX_ROWS))
+
+    print(f"✅ Rows used: {len(ds)} | Columns: {ds.column_names}")
+    return ds
+
+# -------------------------------------------------
+# 1. Bengali (male only)
+# -------------------------------------------------
+#bengali = load_local_parquet(
+#    "local_data/IndicTTS_Bengali/data/**/*.parquet",
+#    text_col="text",
+#    filter_fn=lambda x: "train_bengalimale" in x["utterance_id"]
+#)
+#FINAL.append(bengali)
+
+
+# -------------------------------------------------
+# 2. Arabic
+# -------------------------------------------------
+#arabic = load_local_parquet(
+#    "local_data/arabic_tts/**/*.parquet",
+#    text_col="transcription"
+#)
+#FINAL.append(arabic)
+
+
+# -------------------------------------------------
+# 3. Hindi (female 5hr)
+# -------------------------------------------------
+hindi = load_local_parquet(
+    "local_data/hindi_female_5hr/**/*.parquet",
+    text_col="text"
+)
+FINAL.append(hindi)
+
+
+# -------------------------------------------------
+# 4. English (local)
+# -------------------------------------------------
+#english = load_arrow_dataset(
+#    "local_data/local_eng",
+#    text_col="transcription"
+#)
+#FINAL.append(english)
+
+
+# -------------------------------------------------
+# 5. Punjabi (local)
+# -------------------------------------------------
+#punjabi = load_arrow_dataset(
+#    "local_data/local_punjabi/train",
+#    text_col="transcription"
+#)
+#FINAL.append(punjabi)
+
+
+# -------------------------------------------------
+# Merge ALL
+# -------------------------------------------------
+print("\n🚀 Merging all datasets")
+merged = concatenate_datasets(FINAL)
+
+print("\n📊 FINAL DATASET")
+print(merged)
+print("Total rows:", len(merged))
+print("Columns:", merged.column_names)
+
+
+# -------------------------------------------------
+# Save locally
+# -------------------------------------------------
+OUT_DIR = "data/dataset_hindi_6k"
+merged.save_to_disk(OUT_DIR)
+
+print(f"\n💾 Saved with save_to_disk → {OUT_DIR}")
+
+
+# Optional: also save as Parquet (Trainer-friendly)
+#merged.to_parquet(f"{OUT_DIR}.parquet")
+print(f"💾 Saved Parquet → {OUT_DIR}.parquet")
+

pre-processing.py

@@ -0,0 +1,59 @@
+from datasets import load_from_disk, Audio
+import re
+
+# ==========================
+# Config
+# ==========================
+DATA_DIR = "data/dataset_hindi_6k"
+HF_REPO ="PharynxAI/merged_multilingual_tts_6k_each"
+SAMPLING_RATE = 24000
+
+
+# ==========================
+# Load merged dataset
+# ==========================
+print("📌 Loading merged dataset from disk...")
+ds = load_from_disk(DATA_DIR)
+
+print(ds)
+print(ds.features)
+
+
+# ==========================
+# Apply SAME preprocessing as example
+# ==========================
+def apply_preprocessing(example):
+    text = example["text"].strip()
+
+    # Match example: add Speaker prefix
+    if not text.startswith("Speaker"):
+        text = f"Speaker 0: {text}"
+
+    return {"text": text}
+
+
+ds = ds.map(apply_preprocessing, num_proc=4)
+
+# EXACT equivalent of:
+# dataset = dataset.cast_column("audio", Audio(sampling_rate=24000))
+ds = ds.cast_column("audio", Audio(sampling_rate=SAMPLING_RATE))
+
+
+# ==========================
+# Final verification
+# ==========================
+print("✅ Final features:")
+print(ds.features)
+print("📝 Sample:", ds[0]["text"])
+print("🔊 SR:", ds[0]["audio"]["sampling_rate"])
+
+
+# ==========================
+# Push to Hub
+# ==========================
+#print(f"🚀 Pushing dataset to: {HF_REPO}")
+#ds.push_to_hub(HF_REPO, max_shard_size="500MB",num_proc=1)
+ds.save_to_disk("data/dataset_hindi_6k_processed")
+print("Saved dataset locally")
+print("🎉 Done.")
+

pyproject.toml

@@ -0,0 +1,41 @@
+[project]
+name = "vibevoice-finetuning"
+version = "0.1.0"
+description = "Open Source finetuning code for VibeVoice"
+readme = "README.md"
+requires-python = ">=3.8"
+license = {file = "LICENSE"}
+
+authors = [
+    {name = "jpgallegoarvpb", email = "juanpablo.gallego@voicepowered.ai"}
+]
+
+dependencies = [
+    # ---- DO NOT manage torch here ----
+    # torch
+    # torchaudio
+    # torchvision
+
+    "numpy~=1.26.0",
+    "resampy==0.4.3",
+    "librosa==0.11.0",
+    "s3tokenizer",
+    "transformers==4.51.3",
+    "datasets>=2.18.0",
+    "diffusers==0.29.0",
+    "resemble-perth==1.0.1",
+    "omegaconf==2.3.0",
+    "conformer==0.3.2",
+    "safetensors==0.5.3",
+    "peft>=0.11.0",
+    "tensorboard>=2.12",
+    "wandb"
+]
+
+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+

requirements.txt

@@ -0,0 +1,41 @@
+# ================= Core ML =================
+accelerate==0.28.0
+transformers==4.51.3
+datasets==2.19.2
+diffusers==0.29.0
+peft==0.11.1
+einops==0.8.1
+
+# ================= Audio =================
+librosa==0.11.0
+soundfile==0.13.1
+soxr==1.0.0
+resampy==0.4.3
+audioread==3.1.0
+
+# ================= Data & Math =================
+numpy==1.26.4
+scipy==1.15.3
+pandas==2.3.3
+scikit-learn==1.7.2
+pyarrow==15.0.2
+
+# ================= HF =================
+huggingface-hub==0.36.0
+tokenizers==0.21.4
+safetensors==0.5.3
+
+# ================= Utils =================
+omegaconf==2.3.0
+pyyaml==6.0.3
+tqdm==4.67.1
+regex==2024.11.6
+requests==2.32.5
+filelock==3.15.4
+psutil==6.0.0
+protobuf==4.25.3
+
+# ================= Tracking =================
+wandb==0.17.8
+tensorboard==2.17.0
+

run.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+set -eux
+
+chmod +x training.sh
+./training.sh
+

src/data_vibevoice.py

@@ -0,0 +1,493 @@
+import math
+from dataclasses import dataclass
+from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
+
+import numpy as np
+import torch
+import warnings
+import random
+
+try:
+    import librosa  # type: ignore
+except Exception:  # pragma: no cover
+    librosa = None  # Fallback: user must install librosa when using local audio paths
+
+try:
+    import resampy  # type: ignore
+except Exception:  # pragma: no cover
+    resampy = None
+
+
+def _resample_if_needed(wav: np.ndarray, orig_sr: int, target_sr: int) -> np.ndarray:
+    if orig_sr == target_sr:
+        return wav.astype(np.float32, copy=False)
+    if resampy is not None:
+        return resampy.resample(wav.astype(np.float32), orig_sr, target_sr)
+    if librosa is not None:
+        return librosa.resample(y=wav.astype(np.float32), orig_sr=orig_sr, target_sr=target_sr)
+    warnings.warn(
+        "No resampler available; treating audio as target_sr without resampling. Install resampy or librosa.",
+        RuntimeWarning,
+    )
+    return wav.astype(np.float32, copy=False)
+
+
+# Lightweight HF-style dataset wrapper (optional). Trainer can also pass raw HF datasets directly.
+class VibeVoiceDataset:
+    def __init__(
+        self,
+        dataset: Any,
+        text_column: str = "text",
+        audio_column: str = "audio",
+        voice_prompts_column: Optional[str] = "voice_prompts",
+    ) -> None:
+        self.dataset = dataset
+        self.text_column = text_column
+        self.audio_column = audio_column
+        self.voice_prompts_column = voice_prompts_column
+
+    def __len__(self) -> int:
+        return len(self.dataset)
+
+    def __getitem__(self, idx: int) -> Dict[str, Any]:
+#        item = self.dataset[idx]
+        if isinstance(self.dataset, dict):
+            item = self.dataset["train"][idx]
+        else:
+            item = self.dataset[idx]
+
+        data: Dict[str, Any] = {}
+        data["text"] = item[self.text_column]
+        data["audio"] = item[self.audio_column]
+
+        user_provided_prompt = None
+        if self.voice_prompts_column and self.voice_prompts_column in item:
+            user_provided_prompt = item[self.voice_prompts_column]
+
+        if user_provided_prompt:
+            # A prompt was provided in the dataset, so we use it.
+            if not isinstance(user_provided_prompt, list):
+                data["voice_prompts"] = [user_provided_prompt]
+            else:
+                data["voice_prompts"] = user_provided_prompt
+        else:
+            # FALLBACK: No prompt provided, so we auto-generate one from the target audio.
+            try:
+                target_sr = 24000
+                wav_array = _load_audio_to_24k(item[self.audio_column], target_sr=target_sr)
+                audio_len_seconds = len(wav_array) / target_sr
+
+                min_len_sec = min(5.0, audio_len_seconds / 4.0)
+                max_len_sec = min(15.0, audio_len_seconds / 2.0)
+                
+                if min_len_sec > max_len_sec:
+                    min_len_sec = max_len_sec
+                max_len_sec = min(max_len_sec, audio_len_seconds)
+
+                if max_len_sec > 0.1:
+                    prompt_len_sec = random.uniform(min_len_sec, max_len_sec)
+                    prompt_len_samples = int(prompt_len_sec * target_sr)
+
+                    max_start_sample = len(wav_array) - prompt_len_samples
+                    start_sample = random.randint(0, max_start_sample)
+                    
+                    prompt_crop = wav_array[start_sample : start_sample + prompt_len_samples]
+                    
+                    data["voice_prompts"] = [prompt_crop]
+                else:
+                    data["voice_prompts"] = None
+
+            except Exception as e:
+                warnings.warn(f"Could not create voice prompt for item {idx}: {e}")
+                data["voice_prompts"] = None            
+        return data
+
+
+def _apply_silence_with_crossfade(
+    wav: np.ndarray,
+    *,
+    sample_rate: int,
+    pre_silence_sec: float = 0.25,
+    pre_crossfade_sec: float = 0.25,
+    post_crossfade_sec: float = 0.25,
+    post_silence_sec: float = 0.75,
+) -> np.ndarray:
+    """Pad audio with leading/trailing silence and apply crossfades.
+
+    Structure: [pre_silence][pre_crossfade][audio_body][post_crossfade][post_silence]
+    Crossfades blend the audio with silence linearly to avoid hard edges.
+    """
+
+    wav = np.asarray(wav, dtype=np.float32).reshape(-1)
+
+    start_sil_samples = int(round(pre_silence_sec * sample_rate))
+    end_sil_samples = int(round(post_silence_sec * sample_rate))
+    pre_crossfade_samples = int(round(pre_crossfade_sec * sample_rate))
+    post_crossfade_samples = int(round(post_crossfade_sec * sample_rate))
+
+    total_len = wav.shape[0]
+    if total_len == 0:
+        pieces: List[np.ndarray] = []
+        if start_sil_samples > 0:
+            pieces.append(np.zeros(start_sil_samples, dtype=np.float32))
+        if end_sil_samples > 0:
+            pieces.append(np.zeros(end_sil_samples, dtype=np.float32))
+        return np.concatenate(pieces) if pieces else wav
+
+    start_len = min(pre_crossfade_samples, total_len)
+    remaining_after_start = max(total_len - start_len, 0)
+    end_len = min(post_crossfade_samples, remaining_after_start)
+    middle_end_idx = total_len - end_len
+
+    start_segment = wav[:start_len]
+    middle_segment = wav[start_len:middle_end_idx]
+    end_segment = wav[middle_end_idx:]
+
+    def _linear_fade(num_samples: int, start: float, end: float) -> np.ndarray:
+        if num_samples <= 0:
+            return np.zeros((0,), dtype=np.float32)
+        return np.linspace(start, end, num_samples, endpoint=True, dtype=np.float32)
+
+    start_crossfade = start_segment * _linear_fade(start_len, 0.0, 1.0)
+    end_crossfade = end_segment * _linear_fade(end_segment.shape[0], 1.0, 0.0)
+
+    pieces: List[np.ndarray] = []
+    if start_sil_samples > 0:
+        pieces.append(np.zeros(start_sil_samples, dtype=np.float32))
+    if start_crossfade.size > 0:
+        pieces.append(start_crossfade.astype(np.float32, copy=False))
+    if middle_segment.size > 0:
+        pieces.append(middle_segment.astype(np.float32, copy=False))
+    if end_crossfade.size > 0:
+        pieces.append(end_crossfade.astype(np.float32, copy=False))
+    if end_sil_samples > 0:
+        pieces.append(np.zeros(end_sil_samples, dtype=np.float32))
+
+    return np.concatenate(pieces)
+
+
+# def _load_audio_to_24k(
+#     audio: Union[str, np.ndarray, torch.Tensor, Dict[str, Any]],
+#     *,
+#     target_sr: int = 24000,
+#     augment_with_silence: bool = False,
+# ) -> np.ndarray:
+#     if isinstance(audio, np.ndarray):
+#         wav_out = audio.astype(np.float32)
+#     elif isinstance(audio, torch.Tensor):
+#         wav_out = audio.detach().cpu().float().numpy()
+#     elif isinstance(audio, str):
+#         if librosa is None:
+#             raise RuntimeError("librosa is required to load audio file paths. Please pip install librosa.")
+#         wav, sr = librosa.load(audio, sr=None, mono=True)
+#         wav_out = _resample_if_needed(wav, int(sr), target_sr)
+#     elif isinstance(audio, dict) and "array" in audio and "sampling_rate" in audio:
+#         arr = np.asarray(audio["array"], dtype=np.float32)
+#         sr = int(audio["sampling_rate"])
+#         wav_out = _resample_if_needed(arr, sr, target_sr)
+#     else:
+#         raise ValueError(f"Unsupported audio type: {type(audio)}")
+
+#     wav_out = np.asarray(wav_out, dtype=np.float32)
+
+#     if augment_with_silence:
+#         wav_out = _apply_silence_with_crossfade(wav_out, sample_rate=target_sr)
+
+#     return wav_out
+def _load_audio_to_24k(
+    audio,
+    *,
+    target_sr: int = 24000,
+    augment_with_silence: bool = False,
+):
+
+    # 🔥 FIX: unwrap HF AudioDecoder
+    if hasattr(audio, "__class__") and audio.__class__.__name__ == "AudioDecoder":
+        audio = audio["array"]
+
+    wav_out = None
+
+    try:
+        wav_out = np.asarray(audio, dtype=np.float32)
+    except Exception:
+        wav_out = None
+
+    if wav_out is None and isinstance(audio, torch.Tensor):
+        wav_out = audio.detach().cpu().float().numpy()
+
+    elif wav_out is None and isinstance(audio, dict) and "array" in audio:
+        wav_out = np.asarray(audio["array"], dtype=np.float32)
+
+    elif wav_out is None and isinstance(audio, str):
+        wav, sr = librosa.load(audio, sr=None, mono=True)
+        wav_out = _resample_if_needed(wav, int(sr), target_sr)
+
+    if wav_out is None:
+        raise ValueError(f"Unsupported audio type: {type(audio)}")
+
+    # Safety clamp
+    MAX_AUDIO = target_sr * 30
+    if wav_out.ndim != 1 or len(wav_out) == 0:
+        raise ValueError("Invalid audio")
+
+    if len(wav_out) > MAX_AUDIO:
+        wav_out = wav_out[:MAX_AUDIO]
+
+    if augment_with_silence:
+        wav_out = _apply_silence_with_crossfade(wav_out, sample_rate=target_sr)
+
+    return wav_out
+
+@dataclass
+class VibeVoiceCollator:
+    processor: Any  # VibeVoiceProcessor
+    max_length: Optional[int] = None
+    speech_compress_ratio: int = 3200
+    semantic_vae_dim: int = 128
+    compute_semantics: bool = False
+    debug_checks: bool = False
+
+    text_field: str = "text"
+    audio_field: str = "audio"
+    voice_prompts_field: str = "voice_prompts"
+    voice_prompt_drop_rate: float = 0.0
+
+    def __call__(self, features: Sequence[Dict[str, Any]]) -> Dict[str, Any]:
+        batch_size = len(features)
+
+        sample_input_ids: List[List[int]] = []
+        sample_attention_masks: List[List[int]] = []
+        sample_acoustic_input_masks: List[List[bool]] = []
+        sample_acoustic_loss_masks: List[List[bool]] = []
+
+        all_speech_waveforms: List[np.ndarray] = []
+        all_speech_latent_lengths: List[int] = []
+        per_segment_is_target: List[bool] = []
+
+        for ex in features:
+            text: str = ex.get(self.text_field, "")
+            voice_prompts: Optional[List[Union[str, np.ndarray, torch.Tensor]]] = ex.get(self.voice_prompts_field)
+            target_audio: Union[str, np.ndarray, torch.Tensor, Dict[str, Any]] = ex.get(self.audio_field)
+
+            # Clamp drop rate for safety
+            _drop_rate = self.voice_prompt_drop_rate
+            if _drop_rate < 0.0:
+                _drop_rate = 0.0
+            elif _drop_rate > 1.0:
+                _drop_rate = 1.0
+
+            proc = self.processor(
+                text=[text],
+                voice_samples=[voice_prompts] if voice_prompts is not None and random.random() >= _drop_rate else None,
+                padding=False,
+                truncation=False,
+                max_length=self.max_length,
+                return_tensors="pt",
+            )
+
+            ids = proc["input_ids"][0].tolist()
+            attn = proc.get("attention_mask", torch.ones_like(proc["input_ids"]))[0].tolist()
+            speech_input_mask = proc.get("speech_input_mask")
+            if speech_input_mask is None:
+                speech_input_mask = torch.zeros_like(proc["input_ids"], dtype=torch.bool)
+            speech_input_mask_list = speech_input_mask[0].tolist()
+
+            wav_target = _load_audio_to_24k(target_audio, target_sr=24000, augment_with_silence=True)
+            # Prefer exact frame count from acoustic tokenizer if available; fallback to compress ratio
+            target_latent_len = None
+            try:
+                acoustic_tok = getattr(self.processor, "acoustic_tokenizer", None)
+                if acoustic_tok is not None and hasattr(acoustic_tok, "encode"):
+                    enc_out = acoustic_tok.encode(wav_target)
+                    # Normalize various possible return formats to get time dimension
+                    T = None
+                    try:
+                        # Direct array-like with shape (T, D) or (T,)
+                        if hasattr(enc_out, "shape") and len(getattr(enc_out, "shape", [])) >= 1:
+                            T = int(enc_out.shape[0])
+                        else:
+                            # Nested lists/tuples or ModelOutput-like
+                            cand = enc_out
+                            # Drill down a couple of levels safely
+                            for _ in range(2):
+                                if isinstance(cand, (list, tuple)) and len(cand) > 0:
+                                    cand = cand[0]
+                            if hasattr(cand, "shape") and len(getattr(cand, "shape", [])) >= 1:
+                                T = int(cand.shape[0])
+                    except Exception:
+                        T = None
+                    if T is not None and T > 0:
+                        target_latent_len = T
+            except Exception:
+                target_latent_len = None
+            if target_latent_len is None:
+                target_latent_len = max(1, int(math.ceil(len(wav_target) / float(self.speech_compress_ratio))))
+
+            speech_diff_id = self.processor.tokenizer.speech_diffusion_id
+            target_placeholders = [speech_diff_id] * target_latent_len
+
+            ids_extended = ids + target_placeholders
+            attn_extended = attn + [1] * target_latent_len
+
+            acoustic_input_mask = speech_input_mask_list + [True] * target_latent_len
+            acoustic_loss_mask = ([False] * len(speech_input_mask_list)) + [True] * target_latent_len
+
+            speech_end_id = self.processor.tokenizer.speech_end_id
+            ids_extended.append(speech_end_id)
+            attn_extended.append(1)
+            acoustic_input_mask.append(False)
+            acoustic_loss_mask.append(False)
+
+            # Ensure text decoding sees an explicit end-of-sequence token after speech output.
+            eos_token_id = getattr(self.processor.tokenizer, "eos_id", None)
+            if eos_token_id is None:
+                eos_token_id = getattr(self.processor.tokenizer, "eos_token_id", None)
+            if eos_token_id is not None and eos_token_id >= 0:
+                ids_extended.append(eos_token_id)
+                attn_extended.append(1)
+                acoustic_input_mask.append(False)
+                acoustic_loss_mask.append(False)
+
+            if self.max_length is not None and len(ids_extended) > self.max_length:
+                cut = len(ids_extended) - int(self.max_length)
+                leading_non_acoustic = 0
+                for v in acoustic_input_mask:
+                    if v:
+                        break
+                    leading_non_acoustic += 1
+                if cut > leading_non_acoustic:
+                    raise ValueError(
+                        f"--max_length={self.max_length} would truncate into acoustic tokens. "
+                        f"Needed cut={cut}, but only {leading_non_acoustic} leading non-acoustic tokens available. "
+                        "Increase max_length or shorten text/voice-prompt preamble."
+                    )
+                ids_extended = ids_extended[cut:]
+                attn_extended = attn_extended[cut:]
+                acoustic_input_mask = acoustic_input_mask[cut:]
+                acoustic_loss_mask = acoustic_loss_mask[cut:]
+
+            sample_input_ids.append(ids_extended)
+            sample_attention_masks.append(attn_extended)
+            sample_acoustic_input_masks.append(acoustic_input_mask)
+            sample_acoustic_loss_masks.append(acoustic_loss_mask)
+
+            voice_speeches = []
+            voice_latent_lengths = []
+            if proc.get("speech_tensors") is not None:
+                voice_np = proc["speech_tensors"].cpu().numpy()
+                voice_masks = proc["speech_masks"].cpu().numpy().astype(bool)
+                for seg_idx in range(voice_np.shape[0]):
+                    voice_speeches.append(voice_np[seg_idx])
+                    voice_latent_lengths.append(int(voice_masks[seg_idx].sum()))
+
+            all_speech_waveforms.extend(voice_speeches)
+            all_speech_latent_lengths.extend(voice_latent_lengths)
+            per_segment_is_target.extend([False] * len(voice_speeches))
+
+            all_speech_waveforms.append(wav_target)
+            all_speech_latent_lengths.append(target_latent_len)
+            per_segment_is_target.append(True)
+
+        max_seq_len = max(len(x) for x in sample_input_ids)
+        padded_input_ids = []
+        padded_attention_masks = []
+        padded_acoustic_input_masks = []
+        padded_acoustic_loss_masks = []
+        tok = self.processor.tokenizer
+        pad_token_id = getattr(tok, "pad_token_id", None)
+        if pad_token_id is None or pad_token_id < 0:
+            pad_token_id = getattr(tok, "eos_token_id", None)
+            if pad_token_id is None or pad_token_id < 0:
+                raise ValueError(
+                    "Tokenizer has no pad_token_id or eos_token_id; please set one or pass a valid pad id."
+                )
+        for ids, attn, ain_mask, aloss_mask in zip(
+            sample_input_ids, sample_attention_masks, sample_acoustic_input_masks, sample_acoustic_loss_masks
+        ):
+            pad_len = max_seq_len - len(ids)
+            padded_input_ids.append(ids + [pad_token_id] * pad_len)
+            padded_attention_masks.append(attn + [0] * pad_len)
+            padded_acoustic_input_masks.append(ain_mask + [False] * pad_len)
+            padded_acoustic_loss_masks.append(aloss_mask + [False] * pad_len)
+
+        input_ids_tensor = torch.tensor(padded_input_ids, dtype=torch.long)
+        attention_mask_tensor = torch.tensor(padded_attention_masks, dtype=torch.long)
+        acoustic_input_mask_tensor = torch.tensor(padded_acoustic_input_masks, dtype=torch.bool)
+        acoustic_loss_mask_tensor = torch.tensor(padded_acoustic_loss_masks, dtype=torch.bool)
+
+        if all_speech_waveforms:
+            max_wave_len = max(w.shape[0] for w in all_speech_waveforms)
+            padded_speeches = np.zeros((len(all_speech_waveforms), max_wave_len), dtype=np.float32)
+            for i, w in enumerate(all_speech_waveforms):
+                L = w.shape[0]
+                padded_speeches[i, :L] = w
+
+            max_latent_len = max(all_speech_latent_lengths) if all_speech_latent_lengths else 1
+            speech_masks_np = np.zeros((len(all_speech_waveforms), max_latent_len), dtype=np.bool_)
+            for i, L_lat in enumerate(all_speech_latent_lengths):
+                speech_masks_np[i, :L_lat] = True
+
+            speech_tensors_tensor = torch.tensor(padded_speeches, dtype=torch.float32)
+            speech_masks_tensor = torch.tensor(speech_masks_np, dtype=torch.bool)
+
+            speeches_loss_input_np = np.zeros_like(speech_masks_np, dtype=np.bool_)
+            for i, is_target in enumerate(per_segment_is_target):
+                if is_target:
+                    speeches_loss_input_np[i] = speech_masks_np[i]
+            speeches_loss_input_tensor = torch.tensor(speeches_loss_input_np, dtype=torch.bool)
+
+            # Semantic features
+            if self.compute_semantics and hasattr(self.processor, "semantic_tokenizer") and self.processor.semantic_tokenizer is not None:
+                sem_feats: List[np.ndarray] = []
+                for w in all_speech_waveforms:
+                    try:
+                        # Expect [T, D]  where T ≈ ceil(len(w)/compress_ratio)
+                        sem = self.processor.semantic_tokenizer.encode(w)
+                        sem = np.asarray(sem, dtype=np.float32)
+                    except Exception:
+                        sem = np.zeros((0, self.semantic_vae_dim), dtype=np.float32)
+                    if sem.ndim != 2:
+                        raise RuntimeError(f"Semantic tokenizer returned unexpected shape {sem.shape}. Expect [T, D].")
+                    L = sem.shape[0]
+                    D = sem.shape[1]
+                    if D != self.semantic_vae_dim:
+                        if D < self.semantic_vae_dim:
+                            pad_d = np.zeros((L, self.semantic_vae_dim - D), dtype=np.float32)
+                            sem = np.concatenate([sem, pad_d], axis=1)
+                        else:
+                            sem = sem[:, : self.semantic_vae_dim]
+                    if L < max_latent_len:
+                        pad = np.zeros((max_latent_len - L, self.semantic_vae_dim), dtype=np.float32)
+                        sem = np.concatenate([sem, pad], axis=0)
+                    elif L > max_latent_len:
+                        sem = sem[:max_latent_len]
+                    sem_feats.append(sem.astype(np.float32))
+                speech_semantic_tensors = torch.tensor(np.stack(sem_feats, axis=0), dtype=torch.float32)
+            else:
+                # Semantic tokenizer unavailable while semantics are required for training.
+                # Raise to avoid silently degrading alignment with zeroed features.
+                raise RuntimeError(
+                    "Semantic features are required but could not be computed. "
+                    "Ensure processor.semantic_tokenizer is available or precompute and provide features."
+                )
+        else:
+            speech_tensors_tensor = None
+            speech_masks_tensor = None
+            speeches_loss_input_tensor = None
+            speech_semantic_tensors = None  # No segments in batch
+
+        if self.debug_checks:
+            assert (input_ids_tensor >= 0).all(), "input_ids contains negative indices"
+            if speech_tensors_tensor is not None:
+                assert speech_tensors_tensor.dim() == 2, "Expected speech_tensors 2D [segments, samples]"
+
+        return {
+            "input_ids": input_ids_tensor,
+            "attention_mask": attention_mask_tensor,
+            "speech_tensors": speech_tensors_tensor,
+            "speech_masks": speech_masks_tensor,
+            "speech_semantic_tensors": speech_semantic_tensors,
+            "acoustic_input_mask": acoustic_input_mask_tensor,
+            "acoustic_loss_mask": acoustic_loss_mask_tensor,
+            "speeches_loss_input": speeches_loss_input_tensor,
+        }

src/finetune_vibevoice_lora.py

@@ -0,0 +1,949 @@
+# train_vibevoice_lora.py
+import logging
+import os
+from dataclasses import dataclass, field
+from typing import Any, Dict, List, Optional, Tuple
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from datasets import load_dataset, DatasetDict, VerificationMode, load_from_disk
+
+from transformers import (
+    HfArgumentParser,
+    Trainer,
+    set_seed,
+    TrainerCallback,
+)
+from transformers import TrainingArguments as HfTrainingArguments
+
+from peft import LoraConfig, get_peft_model, TaskType
+
+from vibevoice.modular.modeling_vibevoice import VibeVoiceForConditionalGeneration
+from vibevoice.modular.configuration_vibevoice import VibeVoiceConfig
+from vibevoice.processor.vibevoice_processor import VibeVoiceProcessor
+
+from data_vibevoice import VibeVoiceDataset, VibeVoiceCollator
+
+logger = logging.getLogger(__name__)
+
+# ================== SAMPLE CALLBACK UTILS ==================
+
+import copy
+import torch
+from transformers import TrainerCallback
+
+class EmaCallback(TrainerCallback):
+    def __init__(self, attr_path="model.prediction_head", decay=0.999, device="cpu"):
+        """
+        attr_path: where the head lives under self.model (Trainer wraps your VibeVoiceForConditionalGeneration)
+        decay:     EMA decay (0.999 ~ stable, 0.9999 ~ very smooth, slower to adapt)
+        """
+        self.attr_path = attr_path
+        self.decay = float(decay)
+        self.device = torch.device(device)
+        self.shadow = None
+        self._orig = None  # store non-EMA weights when we swap
+
+    def _get_module(self, model):
+        # Resolve dotted path like "model.prediction_head"
+        mod = model
+        for name in self.attr_path.split('.'):
+            mod = getattr(mod, name)
+        return mod
+
+    def on_train_begin(self, args, state, control, model=None, **kwargs):
+        head = self._get_module(model)
+        self.shadow = {k: p.detach().to(self.device).clone()
+                       for k, p in head.state_dict().items()}
+
+    def on_step_end(self, args, state, control, model=None, **kwargs):
+        if self.shadow is None: return
+        head = self._get_module(model)
+        with torch.no_grad():
+            for k, v in head.state_dict().items():
+                self.shadow[k].mul_(self.decay).add_(v.detach().to(self.device), alpha=(1.0 - self.decay))
+
+    # ---- Swap helpers ----
+    def _swap_in_ema(self, model):
+        head = self._get_module(model)
+        self._orig = copy.deepcopy(head.state_dict())
+        head.load_state_dict(self.shadow, strict=False)
+
+    def _swap_back(self, model):
+        if self._orig is None: return
+        head = self._get_module(model)
+        head.load_state_dict(self._orig, strict=False)
+        self._orig = None
+
+    def on_evaluate(self, args, state, control, model=None, **kwargs):
+        # use EMA during eval
+        self._swap_in_ema(model)
+
+    def on_evaluate_end(self, args, state, control, model=None, **kwargs):
+        self._swap_back(model)
+
+    def on_save(self, args, state, control, model=None, **kwargs):
+        # temporarily swap to EMA, let Trainer save, then swap back
+        self._swap_in_ema(model)
+
+    def on_save_end(self, args, state, control, model=None, **kwargs):
+        self._swap_back(model)
+
+    def on_train_end(self, args, state, control, model=None, **kwargs):
+        # final checkpoint: persist EMA
+        self._swap_in_ema(model)
+
+
+@dataclass
+class ModelArguments:
+    model_name_or_path: Optional[str] = field(
+        default=None, metadata={"help": "Path to VibeVoice base model with config.json"}
+    )
+    processor_name_or_path: Optional[str] = field(
+        default=None, metadata={"help": "Path to processor dir (preprocessor_config.json). Defaults to model path."}
+    )
+    cache_dir: Optional[str] = field(default=None)
+    freeze_acoustic_tokenizer: bool = field(default=True)
+    freeze_semantic_tokenizer: bool = field(default=True)
+    lora_r: int = field(default=8)
+    lora_alpha: int = field(default=32)
+    lora_dropout: float = field(default=0.05)
+    lora_target_modules: str = field(
+        default="q_proj,k_proj,v_proj,o_proj,gate_proj,up_proj,down_proj",
+        metadata={"help": "Comma-separated list of target module names in the LLM blocks"},
+    )
+    lora_wrap_diffusion_head: bool = field(default=False, metadata={"help": "Wrap diffusion head with PEFT LoRA"})
+    train_diffusion_head: bool = field(default=False, metadata={"help": "Train diffusion prediction head (full fine-tune)"})
+    train_connectors: bool = field(default=False, metadata={"help": "Train acoustic/semantic connectors (full fine-tune)"})
+    layers_to_freeze: Optional[str] = field(
+        default=None, 
+        metadata={"help": "Comma-separated indices of diffusion head layers to freeze (e.g., '0,1,5,7,8')."}
+    )
+
+@dataclass
+class DataArguments:
+    dataset_name: Optional[str] = field(default=None, metadata={"help": "HF dataset name or 'json' with --train_jsonl for local files"})
+    dataset_config_name: Optional[str] = field(default=None)
+    train_split_name: str = field(default="train")
+    eval_split_name: Optional[str] = field(default="validation")
+    text_column_name: str = field(default="text")
+    audio_column_name: str = field(default="audio")
+    voice_prompts_column_name: Optional[str] = field(default="voice_prompts")
+    eval_split_size: float = field(default=0.0)
+    ignore_verifications: bool = field(default=False)
+    max_length: Optional[int] = field(default=None)
+    train_jsonl: Optional[str] = field(default=None, metadata={"help": "Path to local train JSONL with {text, audio, [voice_prompts]}"})
+    validation_jsonl: Optional[str] = field(default=None, metadata={"help": "Optional path to local validation JSONL"})
+    voice_prompt_drop_rate: float = field(
+        default=0.0,
+        metadata={"help": "Probability to drop conditioning voice prompt during training (0.0 keep always, 1.0 drop always)."},
+    )
+
+@dataclass
+class CustomTrainingArguments(HfTrainingArguments):
+    ddpm_batch_mul: int = field(default=1)
+    ce_loss_weight: float = field(default=1.0)
+    diffusion_loss_weight: float = field(default=1.0)
+    debug_ce_details: bool = field(default=False)
+    debug_ce_topk: int = field(default=5)
+    debug_ce_max_examples: int = field(default=1)
+    debug_ce_every_n_steps: int = field(default=200)
+    gradient_clipping: bool = field(
+        default=False,
+        metadata={"help": "Enable gradient clipping using max_grad_norm (set via --max_grad_norm, default 1.0). When False, disables clipping by forcing max_grad_norm=0.0."},
+    )
+    debug_save: bool = field(
+        default=False,
+        metadata={"help": "If set, saves model components BEFORE training starts, into output_dir/debug_initial."},
+    )
+
+def build_lora_config(args: ModelArguments) -> LoraConfig:
+    target_modules = [s.strip() for s in args.lora_target_modules.split(",") if s.strip()]
+    return LoraConfig(
+        r=args.lora_r,
+        lora_alpha=args.lora_alpha,
+        lora_dropout=args.lora_dropout,
+        bias="none",
+        task_type=TaskType.CAUSAL_LM,
+        target_modules=target_modules,
+    )
+
+def build_head_lora_config(args: ModelArguments) -> LoraConfig:
+    target_modules = ["noisy_images_proj","cond_proj","gate_proj","up_proj","down_proj","linear"]
+    return LoraConfig(
+        r=args.lora_r,
+        lora_alpha=args.lora_alpha,
+        lora_dropout=args.lora_dropout,
+        bias="none",
+        task_type=TaskType.FEATURE_EXTRACTION,
+        target_modules=target_modules,
+    )
+
+def mask_for_ce(labels: torch.Tensor, attention_mask: torch.Tensor, acoustic_input_mask: torch.Tensor, pad_id: int = -100) -> torch.Tensor:
+    shifted = labels[:, 1:].contiguous()
+    base_mask = attention_mask[:, 1:].contiguous().eq(1) if (attention_mask is not None and attention_mask.numel() > 0) else torch.ones_like(shifted, dtype=torch.bool)
+    label_is_acoustic = acoustic_input_mask[:, 1:].contiguous()
+    final_mask = base_mask & (~label_is_acoustic)
+    out = shifted.clone()
+    out[~final_mask] = pad_id
+    return out
+
+def _patch_acoustic_encode_for_legacy_indexing(model_obj, logger_):
+    try:
+        acoustic = getattr(getattr(model_obj, "model", model_obj), "acoustic_tokenizer", None)
+        if acoustic is None or not hasattr(acoustic, "encode"):
+            logger_.warning("No acoustic_tokenizer.encode() found to patch.")
+            return
+        base_encode = acoustic.encode
+        def encode_wrapped(*args, **kwargs):
+            out = base_encode(*args, **kwargs)
+            try:
+                _ = out[0][0]
+                return out
+            except Exception:
+                pass
+            if isinstance(out, dict):
+                for k in ("frames", "codes", "tokens", "latents", "hidden_states"):
+                    if k in out:
+                        return [[out[k]]]
+                if len(out) > 0:
+                    return [[next(iter(out.values()))]]
+            for attr in ("frames", "codes", "tokens", "latents", "hidden_states"):
+                if hasattr(out, attr):
+                    return [[getattr(out, attr)]]
+            try:
+                if isinstance(out, torch.Tensor):
+                    return [[out]]
+            except Exception:
+                pass
+            return [[out]]
+        acoustic.encode = encode_wrapped
+        logger_.info("Patched acoustic_tokenizer.encode() to return [[...]] for legacy indexing.")
+    except Exception as e:
+        logger_.warning(f"Failed to patch acoustic_tokenizer.encode(): {e}")
+
+def main() -> None:
+    parser = HfArgumentParser((ModelArguments, DataArguments, CustomTrainingArguments))
+    model_args, data_args, training_args = parser.parse_args_into_dataclasses()
+
+    logging.basicConfig(
+        format="%(asctime)s - %(levelname)s - %(name)s - %(message)s",
+        datefmt="%m/%d/%Y %H:%M:%S",
+        level=logging.INFO if training_args.local_rank in [-1, 0] else logging.WARN,
+    )
+    logger.info("Training/evaluation parameters %s", training_args)
+    set_seed(training_args.seed)
+
+    # Configure gradient clipping
+    if not getattr(training_args, "gradient_clipping", False):
+        if hasattr(training_args, "max_grad_norm"):
+            training_args.max_grad_norm = 0.0
+            logger.info("Gradient clipping disabled (set max_grad_norm=0.0). Use --gradient_clipping to enable.")
+    else:
+        if (not hasattr(training_args, "max_grad_norm")) or training_args.max_grad_norm is None or training_args.max_grad_norm <= 0:
+            training_args.max_grad_norm = 1.0
+        logger.info(f"Gradient clipping enabled: max_grad_norm={training_args.max_grad_norm}")
+
+    # Load processor
+    processor_path = model_args.processor_name_or_path or model_args.model_name_or_path
+    if processor_path is None:
+        raise ValueError("--model_name_or_path (or --processor_name_or_path) must be provided")
+    processor: VibeVoiceProcessor = VibeVoiceProcessor.from_pretrained(processor_path)
+
+    # Required special tokens
+    tok = processor.tokenizer
+    for required in ["speech_start_id", "speech_diffusion_id", "speech_end_id"]:
+        if not hasattr(tok, required) or getattr(tok, required) is None:
+            raise RuntimeError(f"Tokenizer missing required special id: {required}")
+
+    # Load model
+    if model_args.model_name_or_path is None:
+        raise ValueError("--model_name_or_path is required to load VibeVoice base model")
+    dtype = torch.float32
+    if training_args.bf16:
+        dtype = torch.bfloat16
+    elif getattr(training_args, "fp16", False):
+        dtype = torch.float16
+    model = VibeVoiceForConditionalGeneration.from_pretrained(
+        model_args.model_name_or_path,
+        torch_dtype=dtype,
+    )
+    _patch_acoustic_encode_for_legacy_indexing(model, logger)
+    processor.semantic_tokenizer = getattr(model.model, "semantic_tokenizer", None)
+
+    # Diagnostics: LM head tie
+    try:
+        in_emb_mod = model.get_input_embeddings()
+        out_emb_mod = model.get_output_embeddings()
+        in_w = getattr(in_emb_mod, "weight", None)
+        out_w = getattr(out_emb_mod, "weight", None)
+        shared_ptr = bool(in_w is not None and out_w is not None and in_w.data_ptr() == out_w.data_ptr())
+        values_equal = False
+        if in_w is not None and out_w is not None and in_w.shape == out_w.shape:
+            try:
+                values_equal = bool(torch.allclose(in_w, out_w))
+            except Exception:
+                values_equal = False
+        try:
+            tie_cfg = getattr(getattr(model.config, "decoder_config", model.config), "tie_word_embeddings", None)
+        except Exception:
+            tie_cfg = getattr(model.config, "tie_word_embeddings", None)
+        logger.info(f"LM head diagnostics -> shared_params={shared_ptr}, values_equal={values_equal}, tie_word_embeddings={tie_cfg}")
+        if out_w is not None:
+            logger.info(f"LM head requires_grad before freeze: {bool(out_w.requires_grad)}")
+    except Exception as e:
+        logger.warning(f"LM head tie diagnostics failed: {e}")
+
+    # Hard-tie LM head
+    try:
+        emb_module = model.get_input_embeddings()
+        head_module = model.get_output_embeddings()
+        if hasattr(emb_module, "weight") and hasattr(head_module, "weight"):
+            if emb_module.weight.shape == head_module.weight.shape and emb_module.weight.data_ptr() != head_module.weight.data_ptr():
+                with torch.no_grad():
+                    head_module.weight = emb_module.weight
+                logger.info("Force-tied LM head weight to input embeddings (pointer share).")
+    except Exception as e:
+        logger.warning(f"Force-tie of LM head failed: {e}")
+
+    # Validate special IDs (info logs only)
+    try:
+        special_names = ["speech_start_id", "speech_diffusion_id", "speech_end_id"]
+        try:
+            vocab_size = int(getattr(model.config.decoder_config, "vocab_size", 0))
+        except Exception:
+            vocab_size = 0
+        in_emb_mod = model.get_input_embeddings()
+        out_emb_mod = model.get_output_embeddings()
+        in_w = getattr(in_emb_mod, "weight", None)
+        out_w = getattr(out_emb_mod, "weight", None)
+        for name in special_names:
+            val = getattr(tok, name, None)
+            exists = (val is not None)
+            in_range = (exists and isinstance(val, int) and 0 <= val < vocab_size)
+            equal_row = None
+            if in_range and in_w is not None and out_w is not None and in_w.shape == out_w.shape and in_w.size(0) > val:
+                try:
+                    equal_row = bool(torch.allclose(in_w[val], out_w[val]))
+                except Exception:
+                    equal_row = False
+            decoded_str = None
+            if exists and isinstance(val, int):
+                try:
+                    decoded_str = tok.decode([val])
+                except Exception:
+                    try:
+                        decoded_str = tok.convert_ids_to_tokens(val)
+                    except Exception:
+                        decoded_str = "<decode_failed>"
+            logger.info(f"Special token check -> {name}={val}, decoded='{decoded_str}', exists={exists}, in_vocab_range={in_range}, emb_vs_head_row_equal={equal_row}")
+    except Exception as e:
+        logger.warning(f"Special token ID/row validation failed: {e}")
+
+    # Quick tokenizer diagnostics (optional)
+    try:
+        logger.info("=== TOKENIZER DIAGNOSTICS ===")
+        logger.info(f"Tokenizer class: {type(tok).__name__}")
+        logger.info(f"Tokenizer vocab_size: {tok.vocab_size}")
+        # tiny CE smoke test
+        with torch.no_grad():
+            simple_text = "The cat sat on the mat."
+            simple_ids = torch.tensor([tok.encode(simple_text, add_special_tokens=True)], device=model.device)
+            simple_mask = torch.ones_like(simple_ids)
+            x = model.get_input_embeddings()(simple_ids)
+            outputs = model.model(inputs_embeds=x, attention_mask=simple_mask, return_dict=True)
+            logits = model.lm_head(outputs.last_hidden_state)
+            shift_logits = logits[:, :-1, :].contiguous()
+            shift_labels = simple_ids[:, 1:].contiguous()
+            ce_loss = F.cross_entropy(shift_logits.view(-1, shift_logits.size(-1)), shift_labels.view(-1), reduction='mean')
+            logger.info(f"Simple text CE loss: {ce_loss.item():.4f}")
+    except Exception as e:
+        logger.warning(f"Tokenizer diagnostics failed: {e}")
+
+    # Disable cache during training
+    if hasattr(model.config, "use_cache") and training_args.do_train:
+        model.config.use_cache = True
+
+    # Freeze tokenizers
+    if model_args.freeze_acoustic_tokenizer and hasattr(model.model, "acoustic_tokenizer"):
+        for p in model.model.acoustic_tokenizer.parameters():
+            p.requires_grad = False
+    if model_args.freeze_semantic_tokenizer and hasattr(model.model, "semantic_tokenizer"):
+        for p in model.model.semantic_tokenizer.parameters():
+            p.requires_grad = False
+
+    # LoRA wrap LLM (optional)
+    lora_cfg = build_lora_config(model_args)
+    tm_lower = [s.strip().lower() for s in model_args.lora_target_modules.split(",") if s.strip()]
+    skip_lm_lora = (len(tm_lower) == 0) or all(t in ("none", "off", "disable", "disabled") for t in tm_lower)
+    if not skip_lm_lora:
+        model.model.language_model = get_peft_model(model.model.language_model, lora_cfg)
+    else:
+        logger.info("Skipping LLM LoRA wrapping (lora_target_modules indicates none).")
+
+    try:
+        model.tie_weights()
+    except Exception:
+        pass
+
+    # Freeze all then enable trainable subsets
+    for _, p in model.named_parameters():
+        p.requires_grad = False
+
+    try:
+        for n, p in model.model.language_model.named_parameters():
+            if "lora_A" in n or "lora_B" in n:
+                p.requires_grad = True
+    except Exception:
+        logger.warning("Could not re-enable LoRA params on language_model.")
+
+    # Diffusion head LoRA wrapping (optional)
+    if getattr(model_args, "lora_wrap_diffusion_head", False) and hasattr(model.model, "prediction_head"):
+        class _HeadForwardShim(nn.Module):
+            def __init__(self, base: nn.Module): super().__init__(); self.base = base
+            def forward(self, *args, **kwargs):
+                if len(args) >= 3:
+                    noisy_images, timesteps, condition = args[:3]
+                else:
+                    noisy_images = kwargs.get("noisy_images")
+                    timesteps = kwargs.get("timesteps")
+                    condition = kwargs.get("condition")
+                return self.base(noisy_images, timesteps, condition)
+        try:
+            shim = _HeadForwardShim(model.model.prediction_head)
+            model.model.prediction_head = get_peft_model(shim, build_head_lora_config(model_args))
+            for n, p in model.model.prediction_head.named_parameters():
+                if "lora_A" in n or "lora_B" in n:
+                    p.requires_grad = True
+        except Exception as e:
+            logger.warning(f"Could not LoRA-wrap diffusion head: {e}")
+
+    # Train full diffusion head (optional)
+    if getattr(model_args, "train_diffusion_head", False) and hasattr(model.model, "prediction_head"):
+        for p in model.model.prediction_head.parameters():
+            p.requires_grad = True
+
+    # Freeze diffusion head layers (optional)
+    if model_args.layers_to_freeze is not None and hasattr(model.model, "prediction_head"):
+        head_params = list(model.model.prediction_head.named_parameters())
+        try:
+            indices_to_freeze = {int(x.strip()) for x in model_args.layers_to_freeze.split(',') if x.strip()}
+            frozen_count = 0
+            for i, (name, param) in enumerate(head_params):
+                if i in indices_to_freeze:
+                    param.requires_grad = False
+                    frozen_count += 1
+                    logger.info(f"Froze layer [{i}]: {name}")
+            logger.info(f"Successfully froze {frozen_count} parameter groups in the diffusion head.")
+        except Exception as e:
+            logger.error(f"Could not parse --layers_to_freeze: {e}")
+            raise
+    
+    # Connectors
+    if getattr(model_args, "train_connectors", False):
+        if hasattr(model.model, "acoustic_connector"):
+            for p in model.model.acoustic_connector.parameters():
+                p.requires_grad = True
+        if hasattr(model.model, "semantic_connector"):
+            for p in model.model.semantic_connector.parameters():
+                p.requires_grad = True
+    else:
+        if hasattr(model.model, "acoustic_connector"):
+            for p in model.model.acoustic_connector.parameters():
+                p.requires_grad = False
+        if hasattr(model.model, "semantic_connector"):
+            for p in model.model.semantic_connector.parameters():
+                p.requires_grad = False
+
+    # Freeze embedding + head
+    try:
+        emb = model.get_input_embeddings()
+        if hasattr(emb, "weight"):
+            emb.weight.requires_grad_(True)
+        head = model.get_output_embeddings()
+        if head is not None and hasattr(head, "weight"):
+            head.weight.requires_grad_(True)
+    except Exception:
+        pass
+
+    # Diagnostics
+    def _sum_params(named_iter):
+        return sum(p.numel() for _, p in named_iter if p.requires_grad)
+    try:
+        lm_lora = _sum_params(model.model.language_model.named_parameters()) if hasattr(model.model, "language_model") else 0
+        pred_head_train = _sum_params(model.model.prediction_head.named_parameters()) if hasattr(model.model, "prediction_head") else 0
+        ac_conn_train = _sum_params(model.model.acoustic_connector.named_parameters()) if hasattr(model.model, "acoustic_connector") else 0
+        se_conn_train = _sum_params(model.model.semantic_connector.named_parameters()) if hasattr(model.model, "semantic_connector") else 0
+        total_trainable = sum(p.numel() for p in model.parameters() if p.requires_grad)
+        logger.info(f"Trainable by block -> LLM-LoRA: {lm_lora:,} | diff_head: {pred_head_train:,} | ac_conn: {ac_conn_train:,} | se_conn: {se_conn_train:,}")
+        logger.info("TOTAL trainable: %s", f"{total_trainable:,}")
+    except Exception:
+        pass
+
+    # Datasets
+    verification_mode = VerificationMode.NO_CHECKS if data_args.ignore_verifications else VerificationMode.BASIC_CHECKS
+    if data_args.train_jsonl is not None:
+        data_files: Dict[str, str] = {"train": data_args.train_jsonl}
+        if data_args.validation_jsonl is not None:
+            data_files["validation"] = data_args.validation_jsonl
+        raw = load_dataset("json", data_files=data_files, verification_mode=verification_mode, cache_dir=model_args.cache_dir)
+    # else:
+    #     if data_args.dataset_name is None:
+    #         raise ValueError("Provide --dataset_name (HF datasets) or use --train_jsonl/--validation_jsonl for local files.")
+    #     raw = load_dataset(
+    #         data_args.dataset_name,
+    #         data_args.dataset_config_name,
+    #         verification_mode=verification_mode,
+    #         cache_dir=model_args.cache_dir,
+    #     )
+
+
+    else:
+        if data_args.dataset_name is None:
+            raise ValueError(
+                "Provide --dataset_name (HF datasets or local path) "
+                "or use --train_jsonl/--validation_jsonl for local files."
+            )
+        if os.path.isdir(data_args.dataset_name):
+            raw = load_from_disk(data_args.dataset_name)
+
+        else:
+            raw = load_dataset(
+                data_args.dataset_name,
+                data_args.dataset_config_name,
+                verification_mode=verification_mode,
+                cache_dir=model_args.cache_dir,
+            )
+
+    # train_ds = raw[data_args.train_split_name]
+    # eval_ds = None
+    # if training_args.do_eval:
+    #     if data_args.eval_split_name and data_args.eval_split_name in raw:
+    #         eval_ds = raw[data_args.eval_split_name]
+    #     elif data_args.eval_split_size and data_args.eval_split_size > 0 and len(train_ds) > 1:
+    #         split = train_ds.train_test_split(test_size=data_args.eval_split_size, seed=training_args.seed)
+    #         train_ds, eval_ds = split["train"], split["test"]
+
+    train_dataset = VibeVoiceDataset(
+        raw,
+        text_column=data_args.text_column_name,
+        audio_column=data_args.audio_column_name,
+        voice_prompts_column=data_args.voice_prompts_column_name,
+    )
+    eval_dataset = None
+    # if eval_ds is not None:
+    #     eval_dataset = VibeVoiceDataset(
+    #         eval_ds,
+    #         text_column=data_args.text_column_name,
+    #         audio_column=data_args.audio_column_name,
+    #         voice_prompts_column=data_args.voice_prompts_column_name,
+    #     )
+
+    # Ratios/dims from processor+model
+    speech_compress_ratio = getattr(processor, "speech_tok_compress_ratio", 3200)
+    semantic_dim = getattr(model.config, "semantic_vae_dim", None)
+    if semantic_dim is None:
+        try:
+            semantic_dim = int(getattr(model.config.semantic_tokenizer_config, "vae_dim", 128))
+        except Exception:
+            semantic_dim = 128
+
+    compute_semantics_flag = hasattr(processor, "semantic_tokenizer") and processor.semantic_tokenizer is not None
+
+    data_collator = VibeVoiceCollator(
+        processor=processor,
+        max_length=data_args.max_length,
+        speech_compress_ratio=speech_compress_ratio,
+        semantic_vae_dim=semantic_dim,
+        compute_semantics=compute_semantics_flag,
+        debug_checks=False,
+        voice_prompt_drop_rate=data_args.voice_prompt_drop_rate,
+    )
+
+    class LoRADebugCallback(TrainerCallback):
+        def __init__(self, log_every_n_steps: int = 50):
+            self.log_every_n_steps = max(1, int(log_every_n_steps))
+            self.prev_param_norms: Dict[str, float] = {}
+            self.lora_param_names: List[str] = []
+
+        def on_train_begin(self, args, state, control, model=None, **kwargs):
+            try:
+                if model is None:
+                    return
+                named: Dict[str, torch.nn.Parameter] = dict(model.named_parameters())
+                self.lora_param_names = [n for n in named.keys() if ("lora_A" in n or "lora_B" in n)]
+                for n in self.lora_param_names:
+                    p = named[n]
+                    self.prev_param_norms[n] = float(p.data.norm().item())
+                total = len(self.lora_param_names)
+                req_grad = sum(1 for n in self.lora_param_names if named[n].requires_grad)
+                num_A = sum(1 for n in self.lora_param_names if "lora_A" in n)
+                num_B = sum(1 for n in self.lora_param_names if "lora_B" in n)
+                zero_B = sum(1 for n in self.lora_param_names if ("lora_B" in n and float(named[n].data.norm().item()) == 0.0))
+                logger.info(f"LoRA debug: found {total} LoRA params (A={num_A}, B={num_B}); trainable={req_grad}. Initial lora_B_zero={zero_B}.")
+                if total == 0:
+                    logger.warning("LoRA debug: No LoRA parameters found. Check lora_target_modules.")
+                if req_grad != total:
+                    logger.warning("LoRA debug: Some LoRA params are frozen. They should be trainable.")
+            except Exception as e:
+                logger.warning(f"LoRA debug (on_train_begin) failed: {e}")
+
+        def on_step_end(self, args, state, control, model=None, **kwargs):
+            try:
+                if model is None or len(self.lora_param_names) == 0:
+                    return
+                step = int(getattr(state, "global_step", 0) or 0)
+                if step % self.log_every_n_steps != 0 and step != 1:
+                    return
+                named: Dict[str, torch.nn.Parameter] = dict(model.named_parameters())
+                changed_A = 0
+                changed_B = 0
+                zero_B = 0
+                eps = 1e-12
+                for n in self.lora_param_names:
+                    p = named.get(n, None)
+                    if p is None:
+                        continue
+                    prev = self.prev_param_norms.get(n, 0.0)
+                    curr = float(p.data.norm().item())
+                    if "lora_A" in n and abs(curr - prev) > eps:
+                        changed_A += 1
+                    if "lora_B" in n:
+                        if abs(curr - prev) > eps:
+                            changed_B += 1
+                        if curr == 0.0:
+                            zero_B += 1
+                    self.prev_param_norms[n] = curr
+                total_A = sum(1 for n in self.lora_param_names if "lora_A" in n)
+                total_B = sum(1 for n in self.lora_param_names if "lora_B" in n)
+                logger.info(f"LoRA debug step {step}: changed A {changed_A}/{total_A}, changed B {changed_B}/{total_B}, lora_B_zero_now={zero_B}.")
+            except Exception as e:
+                logger.warning(f"LoRA debug (on_step_end) failed: {e}")
+
+    class VibeVoiceTrainer(Trainer):
+        def compute_loss(self, model: VibeVoiceForConditionalGeneration, inputs: Dict[str, Any], return_outputs=False, num_items_in_batch: Optional[int] = None):
+            labels = inputs.get("input_ids")
+            attention_mask = inputs.get("attention_mask")
+            acoustic_input_mask = inputs.get("acoustic_input_mask")
+
+            # Ensure semantic tensors exist and have correct dtype/device
+            sem = inputs.get("speech_semantic_tensors", None)
+            # unwrap DDP safely
+            base_model = model.module if hasattr(model, "module") else model
+
+            try:
+                target_dtype = next(base_model.model.semantic_connector.parameters()).dtype
+            except Exception:
+                target_dtype = base_model.get_input_embeddings().weight.dtype
+
+
+            if sem is None:
+                sm = inputs.get("speech_masks")
+                if sm is not None:
+                    zeros = torch.zeros(
+	                sm.size(0), sm.size(1),
+			semantic_dim,
+			dtype=target_dtype,
+			device=sm.device,
+		    ).detach()
+                    zeros = zeros.to(sm.device, non_blocking=True)
+                    inputs["speech_semantic_tensors"] = zeros	
+            else:
+                if isinstance(sem, torch.Tensor):
+                    inputs["speech_semantic_tensors"] = sem.to(dtype=target_dtype)
+            outputs = model(
+                input_ids=inputs.get("input_ids"),
+                attention_mask=attention_mask,
+                speech_tensors=inputs.get("speech_tensors"),
+                speech_masks=inputs.get("speech_masks"),
+                speech_semantic_tensors=inputs.get("speech_semantic_tensors"),
+                acoustic_input_mask=acoustic_input_mask,
+                acoustic_loss_mask=inputs.get("acoustic_loss_mask"),
+                speeches_loss_input=inputs.get("speeches_loss_input"),
+                ddpm_batch_mul=training_args.ddpm_batch_mul,
+            )
+
+            # Invariants: token/latent selection equality across views (warn, don't assert)
+            try:
+                al_mask = inputs.get("acoustic_loss_mask")
+                sp_masks = inputs.get("speech_masks")
+                sp_loss_sel = inputs.get("speeches_loss_input")
+                num_tok_total = int(acoustic_input_mask.sum().item()) if acoustic_input_mask is not None else 0
+                num_tok_loss = int(al_mask.sum().item()) if al_mask is not None else 0
+                num_lat_total = int(sp_masks.sum().item()) if sp_masks is not None else 0
+                num_lat_loss = int(((sp_loss_sel & sp_masks).sum().item())) if (sp_loss_sel is not None and sp_masks is not None) else 0
+                self.log({
+                    "debug/num_tok_total": float(num_tok_total),
+                    "debug/num_tok_loss": float(num_tok_loss),
+                    "debug/num_lat_total": float(num_lat_total),
+                    "debug/num_lat_loss": float(num_lat_loss),
+                })
+                if sp_loss_sel is not None and sp_masks is not None and al_mask is not None:
+                    if num_tok_loss != num_lat_loss:
+                        logger.warning(f"Loss selection mismatch: acoustic_loss_mask={num_tok_loss} vs speeches_loss_input={num_lat_loss}")
+            except Exception:
+                pass
+            # CE Loss
+            logits = outputs.logits
+            ce_labels = mask_for_ce(labels, attention_mask, acoustic_input_mask, pad_id=-100)
+            shift_logits = logits[:, :-1, :].contiguous()
+            loss_fct = nn.CrossEntropyLoss(ignore_index=-100)
+            ce_loss = loss_fct(shift_logits.view(-1, shift_logits.size(-1)), ce_labels.view(-1))
+
+            # Optional CE diagnostics
+            try:
+                self._debug_ce(shift_logits, ce_labels, attention_mask, acoustic_input_mask)
+            except Exception as e:
+                logger.warning(f"Failed invoking CE debug: {e}")
+
+            # Diffusion loss
+            diffusion_loss = outputs.diffusion_loss if outputs.diffusion_loss is not None else torch.tensor(0.0, device=ce_loss.device)
+            total = training_args.ce_loss_weight * ce_loss + training_args.diffusion_loss_weight * diffusion_loss
+
+            # Logs
+            try:
+                prefix = "train" if model.training else "eval"
+                self.log({
+                    f"{prefix}/ce_loss": ce_loss.detach().item(),
+                    f"{prefix}/diffusion_loss": diffusion_loss.detach().item() if isinstance(diffusion_loss, torch.Tensor) else float(diffusion_loss),
+                })
+                if hasattr(self, "optimizer") and self.optimizer is not None and len(self.optimizer.param_groups) > 0:
+                    lr_val = self.optimizer.param_groups[0].get("lr", None)
+                    if lr_val is not None:
+                        self.log({"train/learning_rate_real": float(lr_val)})
+            except Exception:
+                pass
+
+            # if return_outputs:
+            #     return total, outputs
+            # if not model.training:
+            #     return {"loss": total}
+            # return total
+
+            if return_outputs:
+                return total, outputs
+            return total
+
+        def prediction_step(
+            self,
+            model,
+            inputs,
+            prediction_loss_only=False,
+            ignore_keys=None,
+        ):
+            model.eval()
+            with torch.no_grad():
+                loss = self.compute_loss(model, inputs)
+
+            # HuggingFace expects: (loss, logits, labels)
+            # We don't need logits or labels, so return None for both
+            return loss, None, None
+
+
+
+        def _debug_ce(self, shift_logits: torch.Tensor, ce_labels: torch.Tensor, attention_mask: Optional[torch.Tensor], acoustic_input_mask: Optional[torch.Tensor]):
+            try:
+                if not getattr(training_args, "debug_ce_details", False):
+                    return
+                step = int(getattr(self.state, "global_step", 0) or 0)
+                every_n = max(1, int(getattr(training_args, "debug_ce_every_n_steps", 200) or 200))
+                if not (step <= 1 or (step % every_n == 0)):
+                    return
+
+                with torch.no_grad():
+                    vocab = shift_logits.size(-1)
+                    per_token_loss = F.cross_entropy(
+                        shift_logits.view(-1, vocab),
+                        ce_labels.view(-1),
+                        reduction="none",
+                        ignore_index=-100,
+                    ).view_as(ce_labels)
+
+                    valid_mask = ce_labels.ne(-100)
+                    num_valid = int(valid_mask.sum().item())
+                    avg_loss = float((per_token_loss[valid_mask].mean().item())) if num_valid > 0 else float("nan")
+
+                    per_ex_avgs = []
+                    max_examples = max(1, int(getattr(training_args, "debug_ce_max_examples", 1) or 1))
+                    B = ce_labels.size(0)
+                    for b in range(min(B, max_examples)):
+                        vb = valid_mask[b]
+                        if int(vb.sum().item()) > 0:
+                            per_ex_avgs.append(float(per_token_loss[b][vb].mean().item()))
+                        else:
+                            per_ex_avgs.append(float("nan"))
+                    logger.info(f"CE debug: tokens_in_loss={num_valid}, avg_loss={avg_loss:.4f}, per_example_avgs={[round(x,4) if x==x else None for x in per_ex_avgs]}")
+            except Exception as e:
+                logger.warning(f"CE detailed debug failed: {e}")
+
+        # --------- CRITICAL SAVE OVERRIDES: also dump FULL head/connectors for inference ---------
+  
+
+        def _save(self, output_dir: Optional[str] = None, state_dict=None) -> None:
+            try:
+                target_dir = output_dir or self.args.output_dir
+                lora_out = os.path.join(target_dir, "lora")
+                os.makedirs(lora_out, exist_ok=True)
+    
+                # --- LLM PEFT adapters (if LoRA-wrapped) ---
+                language_model = getattr(self.model.model, "language_model", None)
+                if hasattr(language_model, "save_pretrained"):
+                    language_model.save_pretrained(lora_out)
+    
+                # --- Diffusion head PEFT adapters (if LoRA-wrapped) ---
+                pred_head = getattr(self.model.model, "prediction_head", None)
+                if hasattr(pred_head, "save_pretrained"):
+                    ph_dir = os.path.join(lora_out, "diffusion_head")
+                    os.makedirs(ph_dir, exist_ok=True)
+                    pred_head.save_pretrained(ph_dir)
+    
+                # --- ALWAYS save FULL diffusion head state_dict for fallback ---
+                if pred_head is not None and hasattr(pred_head, "state_dict"):
+                    sd = pred_head.state_dict()
+                    torch.save(sd, os.path.join(lora_out, "diffusion_head_full.bin"))
+                    ph_dir = os.path.join(lora_out, "diffusion_head")
+                    os.makedirs(ph_dir, exist_ok=True)
+                    torch.save(sd, os.path.join(ph_dir, "diffusion_head_full.bin"))
+    
+                # --- Connectors (plain state_dicts) ---
+                ac = getattr(self.model.model, "acoustic_connector", None)
+                if ac is not None:
+                    ac_dir = os.path.join(lora_out, "acoustic_connector")
+                    os.makedirs(ac_dir, exist_ok=True)
+                    torch.save(ac.state_dict(), os.path.join(ac_dir, "pytorch_model.bin"))
+    
+                se = getattr(self.model.model, "semantic_connector", None)
+                if se is not None:
+                    se_dir = os.path.join(lora_out, "semantic_connector")
+                    os.makedirs(se_dir, exist_ok=True)
+                    torch.save(se.state_dict(), os.path.join(se_dir, "pytorch_model.bin"))
+    
+            except Exception as e:
+                logger.warning(f"Failed to save LoRA assets: {e}")
+
+
+    # ------------- Build the Trainer -------------
+
+    # Resolve which adapters to apply in samples
+
+    ema_cb = EmaCallback(attr_path="model.prediction_head", decay=0.999, device="cpu")
+
+    trainer = VibeVoiceTrainer(
+        model=model,
+        args=training_args,
+        train_dataset=train_dataset,
+        eval_dataset=eval_dataset,
+        data_collator=data_collator,
+        callbacks=[ema_cb, LoRADebugCallback(log_every_n_steps=(int(getattr(training_args, "logging_steps", 50) or 50)))],
+    )
+
+    # Optional debug pre-training save
+    if getattr(training_args, "debug_save", False):
+        try:
+            debug_dir = os.path.join(training_args.output_dir, "debug_initial")
+            lora_out = os.path.join(debug_dir, "lora")
+            os.makedirs(lora_out, exist_ok=True)
+            logger.info(f"[debug_save] Saving initial (pre-training) model components to: {debug_dir}")
+            # language model adapters / base
+            try:
+                if hasattr(model.model.language_model, "save_pretrained"):
+                    model.model.language_model.save_pretrained(lora_out)
+            except Exception as e_lm:
+                logger.warning(f"[debug_save] Failed to save language_model: {e_lm}")
+            # diffusion head
+            try:
+                if hasattr(model.model, "prediction_head") and hasattr(model.model.prediction_head, "save_pretrained"):
+                    model.model.prediction_head.save_pretrained(os.path.join(lora_out, "diffusion_head"))
+            except Exception as e_head:
+                logger.warning(f"[debug_save] Failed to save prediction_head: {e_head}")
+            # NEW: full diffusion head state_dict as fallback
+            try:
+                ph = getattr(model.model, "prediction_head", None)
+                if ph is not None and hasattr(ph, "state_dict"):
+                    sd = ph.state_dict()
+                    torch.save(sd, os.path.join(lora_out, "diffusion_head_full.bin"))
+                    os.makedirs(os.path.join(lora_out, "diffusion_head"), exist_ok=True)
+                    torch.save(sd, os.path.join(lora_out, "diffusion_head", "diffusion_head_full.bin"))
+            except Exception as e:
+                logger.warning(f"[debug_save] Failed to save FULL diffusion head: {e}")
+            # connectors
+            try:
+                ac_conn = getattr(model.model, "acoustic_connector", None)
+                if ac_conn is not None:
+                    ac_dir = os.path.join(lora_out, "acoustic_connector")
+                    os.makedirs(ac_dir, exist_ok=True)
+                    torch.save(ac_conn.state_dict(), os.path.join(ac_dir, "pytorch_model.bin"))
+            except Exception as e_ac:
+                logger.warning(f"[debug_save] Failed to save acoustic_connector: {e_ac}")
+            try:
+                se_conn = getattr(model.model, "semantic_connector", None)
+                if se_conn is not None:
+                    se_dir = os.path.join(lora_out, "semantic_connector")
+                    os.makedirs(se_dir, exist_ok=True)
+                    torch.save(se_conn.state_dict(), os.path.join(se_dir, "pytorch_model.bin"))
+            except Exception as e_se:
+                logger.warning(f"[debug_save] Failed to save semantic_connector: {e_se}")
+        except Exception as e:
+            logger.warning(f"[debug_save] Unexpected failure saving initial components: {e}")
+
+    if getattr(training_args, "gradient_checkpointing", True):
+        try:
+            model.gradient_checkpointing_enable()
+        except Exception:
+            logger.warning("Failed to enable gradient checkpointing on the model.")
+
+    if training_args.do_train:
+        trainer.train(resume_from_checkpoint=training_args.resume_from_checkpoint)
+    
+        lora_out = os.path.join(training_args.output_dir, "lora")
+        os.makedirs(lora_out, exist_ok=True)
+    
+        # LLM PEFT (if any)
+        lm = getattr(model.model, "language_model", None)
+        if hasattr(lm, "save_pretrained"):
+            lm.save_pretrained(lora_out)
+    
+        # Diffusion head PEFT (if any)
+        ph = getattr(model.model, "prediction_head", None)
+        if hasattr(ph, "save_pretrained"):
+            ph_dir = os.path.join(lora_out, "diffusion_head")
+            os.makedirs(ph_dir, exist_ok=True)
+            ph.save_pretrained(ph_dir)
+    
+        # ALWAYS: full diffusion head state_dict fallback
+        try:
+            if ph is not None and hasattr(ph, "state_dict"):
+                sd = ph.state_dict()
+                torch.save(sd, os.path.join(lora_out, "diffusion_head_full.bin"))
+                ph_dir = os.path.join(lora_out, "diffusion_head")
+                os.makedirs(ph_dir, exist_ok=True)
+                torch.save(sd, os.path.join(ph_dir, "diffusion_head_full.bin"))
+        except Exception as e:
+            logger.warning(f"Failed to save FULL diffusion head at end: {e}")
+    
+        # Connectors (if trained)
+        try:
+            ac = getattr(model.model, "acoustic_connector", None)
+            if ac is not None:
+                ac_dir = os.path.join(lora_out, "acoustic_connector")
+                os.makedirs(ac_dir, exist_ok=True)
+                torch.save(ac.state_dict(), os.path.join(ac_dir, "pytorch_model.bin"))
+        except Exception as e:
+            logger.warning(f"Failed to save acoustic_connector: {e}")
+    
+        try:
+            se = getattr(model.model, "semantic_connector", None)
+            if se is not None:
+                se_dir = os.path.join(lora_out, "semantic_connector")
+                os.makedirs(se_dir, exist_ok=True)
+                torch.save(se.state_dict(), os.path.join(se_dir, "pytorch_model.bin"))
+        except Exception as e:
+            logger.warning(f"Failed to save semantic_connector: {e}")
+
+    if training_args.do_eval and eval_dataset is not None:
+        trainer.evaluate()
+
+
+if __name__ == "__main__":
+    main()

src/vibevoice/configs/qwen2.5_1.5b_64k.json

@@ -0,0 +1,112 @@
+{
+  "_attn_implementation_autoset": true,
+  "acoustic_vae_dim": 64,
+  "acoustic_tokenizer_config": {
+    "causal": true,
+    "channels": 1,
+    "conv_bias": true,
+    "conv_norm": "none",
+    "corpus_normalize": 0.0,
+    "decoder_depths": null,
+    "decoder_n_filters": 32,
+    "decoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "disable_last_norm": true,
+    "encoder_depths": "3-3-3-3-3-3-8",
+    "encoder_n_filters": 32,
+    "encoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "fix_std": 0.5,
+    "layer_scale_init_value": 1e-06,
+    "layernorm": "RMSNorm",
+    "layernorm_elementwise_affine": true,
+    "layernorm_eps": 1e-05,
+    "mixer_layer": "depthwise_conv",
+    "model_type": "vibepod_acoustic_tokenizer",
+    "pad_mode": "constant",
+    "std_dist_type": "gaussian",
+    "vae_dim": 64,
+    "weight_init_value": 0.01
+  },
+  "decoder_config": {
+    "attention_dropout": 0.0,
+    "hidden_act": "silu",
+    "hidden_size": 1536,
+    "initializer_range": 0.02,
+    "intermediate_size": 8960,
+    "max_position_embeddings": 65536,
+    "max_window_layers": 28,
+    "model_type": "qwen2",
+    "num_attention_heads": 12,
+    "num_hidden_layers": 28,
+    "num_key_value_heads": 2,
+    "rms_norm_eps": 1e-06,
+    "rope_scaling": null,
+    "rope_theta": 1000000.0,
+    "sliding_window": null,
+    "tie_word_embeddings": true,
+    "torch_dtype": "bfloat16",
+    "use_cache": true,
+    "use_sliding_window": false,
+    "vocab_size": 151936
+  },
+  "diffusion_head_config": {
+    "ddpm_batch_mul": 4,
+    "ddpm_beta_schedule": "cosine",
+    "ddpm_num_inference_steps": 20,
+    "ddpm_num_steps": 1000,
+    "diffusion_type": "ddpm",
+    "head_ffn_ratio": 3.0,
+    "head_layers": 4,
+    "hidden_size": 1536,
+    "latent_size": 64,
+    "model_type": "vibepod_diffusion_head",
+    "prediction_type": "v_prediction",
+    "rms_norm_eps": 1e-05,
+    "speech_vae_dim": 64
+  },
+  "model_type": "vibepod",
+  "semantic_tokenizer_config": {
+    "causal": true,
+    "channels": 1,
+    "conv_bias": true,
+    "conv_norm": "none",
+    "corpus_normalize": 0.0,
+    "disable_last_norm": true,
+    "encoder_depths": "3-3-3-3-3-3-8",
+    "encoder_n_filters": 32,
+    "encoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "fix_std": 0,
+    "layer_scale_init_value": 1e-06,
+    "layernorm": "RMSNorm",
+    "layernorm_elementwise_affine": true,
+    "layernorm_eps": 1e-05,
+    "mixer_layer": "depthwise_conv",
+    "model_type": "vibepod_semantic_tokenizer",
+    "pad_mode": "constant",
+    "std_dist_type": "none",
+    "vae_dim": 128,
+    "weight_init_value": 0.01
+  },
+  "semantic_vae_dim": 128,
+  "torch_dtype": "bfloat16"
+}

src/vibevoice/configs/qwen2.5_7b_32k.json

@@ -0,0 +1,113 @@
+{
+  "_attn_implementation_autoset": true,
+  "acoustic_vae_dim": 64,
+  "acoustic_tokenizer_config": {
+    "causal": true,
+    "channels": 1,
+    "conv_bias": true,
+    "conv_norm": "none",
+    "corpus_normalize": 0.0,
+    "decoder_depths": null,
+    "decoder_n_filters": 32,
+    "decoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "disable_last_norm": true,
+    "encoder_depths": "3-3-3-3-3-3-8",
+    "encoder_n_filters": 32,
+    "encoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "fix_std": 0.5,
+    "layer_scale_init_value": 1e-06,
+    "layernorm": "RMSNorm",
+    "layernorm_elementwise_affine": true,
+    "layernorm_eps": 1e-05,
+    "mixer_layer": "depthwise_conv",
+    "model_type": "vibepod_acoustic_tokenizer",
+    "pad_mode": "constant",
+    "std_dist_type": "gaussian",
+    "vae_dim": 64,
+    "weight_init_value": 0.01
+  },
+  "decoder_config": {
+    "attention_dropout": 0.0,
+    "hidden_act": "silu",
+    "hidden_size": 3584,
+    "initializer_range": 0.02,
+    "intermediate_size": 18944,
+    "max_position_embeddings": 32768,
+    "max_window_layers": 28,
+    "model_type": "qwen2",
+    "num_attention_heads": 28,
+    "num_hidden_layers": 28,
+    "num_key_value_heads": 4,
+    "rms_norm_eps": 1e-06,
+    "rope_theta": 1000000.0,
+    "sliding_window": null,
+    "tie_word_embeddings": false,
+    "torch_dtype": "bfloat16",
+    "transformers_version": "4.40.1",
+    "use_cache": true,
+    "use_mrope": false,
+    "use_sliding_window": false,
+    "vocab_size": 152064
+  },
+  "diffusion_head_config": {
+    "ddpm_batch_mul": 4,
+    "ddpm_beta_schedule": "cosine",
+    "ddpm_num_inference_steps": 20,
+    "ddpm_num_steps": 1000,
+    "diffusion_type": "ddpm",
+    "head_ffn_ratio": 3.0,
+    "head_layers": 4,
+    "hidden_size": 3584,
+    "latent_size": 64,
+    "model_type": "vibepod_diffusion_head",
+    "prediction_type": "v_prediction",
+    "rms_norm_eps": 1e-05,
+    "speech_vae_dim": 64
+  },
+  "model_type": "vibepod",
+  "semantic_tokenizer_config": {
+    "causal": true,
+    "channels": 1,
+    "conv_bias": true,
+    "conv_norm": "none",
+    "corpus_normalize": 0.0,
+    "disable_last_norm": true,
+    "encoder_depths": "3-3-3-3-3-3-8",
+    "encoder_n_filters": 32,
+    "encoder_ratios": [
+      8,
+      5,
+      5,
+      4,
+      2,
+      2
+    ],
+    "fix_std": 0,
+    "layer_scale_init_value": 1e-06,
+    "layernorm": "RMSNorm",
+    "layernorm_elementwise_affine": true,
+    "layernorm_eps": 1e-05,
+    "mixer_layer": "depthwise_conv",
+    "model_type": "vibepod_semantic_tokenizer",
+    "pad_mode": "constant",
+    "std_dist_type": "none",
+    "vae_dim": 128,
+    "weight_init_value": 0.01
+  },
+  "semantic_vae_dim": 128,
+  "torch_dtype": "bfloat16"
+}

src/vibevoice/modular/configuration_vibevoice.py

@@ -0,0 +1,248 @@
+""" VibeVoice_AcousticTokenizer model configuration"""
+
+from typing import Dict, List, Optional, Tuple
+
+from transformers.configuration_utils import PretrainedConfig 
+from transformers.utils import logging
+
+from transformers.models.qwen2.configuration_qwen2 import Qwen2Config
+
+logger = logging.get_logger(__name__)
+
+
+class VibeVoiceAcousticTokenizerConfig(PretrainedConfig):
+    model_type = "vibevoice_acoustic_tokenizer"
+
+    def __init__(
+        self,
+        channels: int = 1,
+        corpus_normalize: float = 0.0,
+        causal: bool = True,
+        vae_dim: int = 64,
+        fix_std: float = 0.5,
+        std_dist_type: str = 'gaussian',
+        # common 
+        mixer_layer: str = 'depthwise_conv',
+        conv_norm: str = 'none',
+        pad_mode: str = 'constant',
+        disable_last_norm: bool = True,
+        layernorm: str = 'RMSNorm',
+        layernorm_eps: float = 1e-5,
+        layernorm_elementwise_affine: bool = True,
+        conv_bias: bool = True,
+        layer_scale_init_value: float = 1e-6,
+        weight_init_value: float = 1e-2,
+        # encoder specific
+        encoder_n_filters: int = 32,
+        encoder_ratios: Optional[List[int]] = [8,5,5,4,2,2],
+        encoder_depths: str = "3-3-3-3-3-3-8",
+        # decoder specific
+        decoder_n_filters: int = 32,
+        decoder_ratios: Optional[List[int]] = None, # if None, same as encoder
+        decoder_depths: Optional[str] = None,
+        **kwargs
+    ):
+        super().__init__(**kwargs)
+        self.channels = channels
+        self.corpus_normalize = corpus_normalize
+        self.causal = causal
+        self.vae_dim = vae_dim
+        self.fix_std = fix_std
+        self.std_dist_type = std_dist_type
+        
+        # common parameters
+        self.conv_norm = conv_norm
+        self.pad_mode = pad_mode
+        self.layernorm_eps = layernorm_eps
+        self.disable_last_norm = disable_last_norm
+        self.layernorm = layernorm
+        self.layernorm_elementwise_affine = layernorm_elementwise_affine
+        self.conv_bias = conv_bias
+        self.layer_scale_init_value = layer_scale_init_value
+        self.weight_init_value = weight_init_value
+        self.mixer_layer = mixer_layer
+
+        # encoder specific parameters
+        self.encoder_n_filters = encoder_n_filters
+        self.encoder_ratios = encoder_ratios
+        self.encoder_depths = encoder_depths
+        
+        # decoder specific parameters
+        self.decoder_ratios = decoder_ratios if decoder_ratios is not None else encoder_ratios
+        self.decoder_n_filters = decoder_n_filters
+        self.decoder_depths = decoder_depths
+
+
+class VibeVoiceSemanticTokenizerConfig(PretrainedConfig):
+    model_type = "vibevoice_semantic_tokenizer"
+    
+    def __init__(
+        self,
+        channels: int = 1,
+        corpus_normalize: float = 0.0,
+        causal: bool = True,
+        vae_dim: int = 64,
+        fix_std: float = 0,
+        std_dist_type: str = 'none',
+        # common 
+        mixer_layer: str = 'depthwise_conv',
+        conv_norm: str = 'none',
+        pad_mode: str = 'constant',
+        disable_last_norm: bool = True,
+        layernorm: str = 'RMSNorm',
+        layernorm_eps: float = 1e-5,
+        layernorm_elementwise_affine: bool = True,
+        conv_bias: bool = True,
+        layer_scale_init_value: float = 1e-6,
+        weight_init_value: float = 1e-2,
+        # encoder specific
+        encoder_n_filters: int = 32,
+        encoder_ratios: Optional[List[int]] = [8,5,5,4,2,2],
+        encoder_depths: str = "3-3-3-3-3-3-8",
+        **kwargs
+    ):
+        super().__init__(**kwargs)
+        self.channels = channels
+        self.corpus_normalize = corpus_normalize
+        self.causal = causal
+        self.vae_dim = vae_dim
+        self.fix_std = fix_std
+        self.std_dist_type = std_dist_type
+        
+        # common parameters
+        self.conv_norm = conv_norm
+        self.pad_mode = pad_mode
+        self.layernorm_eps = layernorm_eps
+        self.disable_last_norm = disable_last_norm
+        self.layernorm = layernorm
+        self.layernorm_elementwise_affine = layernorm_elementwise_affine
+        self.conv_bias = conv_bias
+        self.layer_scale_init_value = layer_scale_init_value
+        self.weight_init_value = weight_init_value
+        self.mixer_layer = mixer_layer
+
+        # encoder specific parameters
+        self.encoder_n_filters = encoder_n_filters
+        self.encoder_ratios = encoder_ratios
+        self.encoder_depths = encoder_depths
+        
+
+class VibeVoiceDiffusionHeadConfig(PretrainedConfig):
+    model_type = "vibevoice_diffusion_head"
+
+    def __init__(
+        self,
+        hidden_size=768,
+        head_layers=4,
+        head_ffn_ratio=3.0,
+        rms_norm_eps=1e-5,
+        latent_size=64,
+        speech_vae_dim=None,
+        prediction_type="v_prediction",
+        diffusion_type="ddpm",
+        ddpm_num_steps=1000,
+        ddpm_num_inference_steps=20,
+        ddpm_beta_schedule="cosine",
+        ddpm_batch_mul=4,
+        **kwargs
+    ):
+        self.hidden_size = hidden_size
+        self.head_layers = head_layers
+        self.head_ffn_ratio = head_ffn_ratio
+        self.rms_norm_eps = rms_norm_eps
+        self.latent_size = latent_size
+        self.speech_vae_dim = speech_vae_dim
+        self.prediction_type = prediction_type
+        self.diffusion_type = diffusion_type
+        self.ddpm_num_steps = ddpm_num_steps
+        self.ddpm_num_inference_steps = ddpm_num_inference_steps
+        self.ddpm_beta_schedule = ddpm_beta_schedule
+        self.ddpm_batch_mul = ddpm_batch_mul
+        
+        super().__init__(**kwargs)
+
+class VibeVoiceConfig(PretrainedConfig):
+    model_type = "vibevoice"
+    is_composition = True
+    sub_configs = {
+        "acoustic_tokenizer_config": VibeVoiceAcousticTokenizerConfig, 
+        "semantic_tokenizer_config": VibeVoiceSemanticTokenizerConfig,
+        "decoder_config": Qwen2Config,
+        "diffusion_head_config": VibeVoiceDiffusionHeadConfig,
+    }
+    # keys_to_ignore_at_inference = ["past_key_values"]
+    # Default tensor parallel plan for base model `Qwen2`
+    base_model_tp_plan = {
+        "layers.*.self_attn.q_proj": "colwise",
+        "layers.*.self_attn.k_proj": "colwise",
+        "layers.*.self_attn.v_proj": "colwise",
+        "layers.*.self_attn.o_proj": "rowwise",
+        "layers.*.mlp.gate_proj": "colwise",
+        "layers.*.mlp.up_proj": "colwise",
+        "layers.*.mlp.down_proj": "rowwise",
+    }
+    
+    def __init__(
+        self,
+        acoustic_tokenizer_config=None,
+        semantic_tokenizer_config=None,
+        decoder_config=None,
+        diffusion_head_config=None,
+        **kwargs
+    ):
+
+        # kwargs["_attn_implementation"] = "flash_attention_2"
+        kwargs["_attn_implementation_autoset"] = False 
+
+        if acoustic_tokenizer_config is None:
+            self.acoustic_tokenizer_config = self.sub_configs["acoustic_tokenizer_config"]()
+        elif isinstance(acoustic_tokenizer_config, dict):
+            acoustic_tokenizer_config["model_type"] = "vibevoice_acoustic_tokenizer"
+            self.acoustic_tokenizer_config = self.sub_configs["acoustic_tokenizer_config"](**acoustic_tokenizer_config)
+        elif isinstance(acoustic_tokenizer_config, VibeVoiceAcousticTokenizerConfig):
+            # If an instance of the config class is provided
+            self.acoustic_tokenizer_config = acoustic_tokenizer_config
+
+        if semantic_tokenizer_config is None:
+            self.semantic_tokenizer_config = self.sub_configs["semantic_tokenizer_config"]()
+        elif isinstance(semantic_tokenizer_config, dict):
+            semantic_tokenizer_config["model_type"] = "vibevoice_semantic_tokenizer"
+            self.semantic_tokenizer_config = self.sub_configs["semantic_tokenizer_config"](**semantic_tokenizer_config)
+        elif isinstance(semantic_tokenizer_config, VibeVoiceSemanticTokenizerConfig):
+            # If an instance of the config class is provided
+            self.semantic_tokenizer_config = semantic_tokenizer_config
+
+        if decoder_config is None:
+            self.decoder_config = self.sub_configs["decoder_config"]()
+        elif isinstance(decoder_config, dict):
+            # If a dictionary is provided, instantiate the config class with it
+            # self.decoder_config = self.sub_configs["decoder_config"](**decoder_config)
+            if decoder_config.get("model_type", '') == "qwen2":
+                self.decoder_config = Qwen2Config(**decoder_config)
+            else:
+                raise ValueError(f"Unsupported decoder model type: {decoder_config.get('model_type', '')}")
+        elif isinstance(decoder_config, (Qwen2Config,)):
+            # If an instance of the config class is provided
+            self.decoder_config = decoder_config
+
+        if diffusion_head_config is None:
+            self.diffusion_head_config = self.sub_configs["diffusion_head_config"]()
+        elif isinstance(diffusion_head_config, dict):
+            diffusion_head_config["model_type"] = "vibevoice_diffusion_head"
+            self.diffusion_head_config = self.sub_configs["diffusion_head_config"](**diffusion_head_config)
+        elif isinstance(diffusion_head_config, VibeVoiceDiffusionHeadConfig):
+            # If an instance of the config class is provided
+            self.diffusion_head_config = diffusion_head_config
+
+        # other parameters
+        self.acoustic_vae_dim = getattr(self.acoustic_tokenizer_config, 'vae_dim', 64)
+        self.semantic_vae_dim = getattr(self.semantic_tokenizer_config, 'vae_dim', 128)
+
+        super().__init__(**kwargs)
+
+__all__ = [
+    "VibeVoiceAcousticTokenizerConfig", 
+    "VibeVoiceSemanticTokenizerConfig", 
+    "VibeVoiceDiffusionHeadConfig", 
+    "VibeVoiceConfig"
+]

src/vibevoice/modular/modeling_vibevoice.py

@@ -0,0 +1,508 @@
+from dataclasses import dataclass
+from typing import Dict, List, Optional, Tuple, Union, Callable
+from tqdm import tqdm
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import torch.distributed as dist
+
+from transformers.models.auto import AutoModel, AutoModelForCausalLM
+
+from transformers.activations import ACT2FN
+from transformers.modeling_outputs import CausalLMOutput, BaseModelOutputWithPast, ModelOutput
+from transformers.models.llama.modeling_llama import LlamaRMSNorm
+from transformers import modeling_utils
+from transformers.modeling_utils import PreTrainedModel
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.utils import logging
+
+
+from .modular_vibevoice_tokenizer import VibeVoiceTokenizerStreamingCache, VibeVoiceAcousticTokenizerModel, VibeVoiceSemanticTokenizerModel
+from .modular_vibevoice_diffusion_head import VibeVoiceDiffusionHead
+from vibevoice.schedule.dpm_solver import DPMSolverMultistepScheduler
+
+from .configuration_vibevoice import VibeVoiceConfig
+
+
+logger = logging.get_logger(__name__)
+
+if not hasattr(modeling_utils, "ALL_PARALLEL_STYLES") or modeling_utils.ALL_PARALLEL_STYLES is None:
+    modeling_utils.ALL_PARALLEL_STYLES = ["tp", "none", "colwise", "rowwise"]
+
+@dataclass
+class VibeVoiceCausalLMOutputWithPast(ModelOutput):
+    loss: Optional[torch.FloatTensor] = None
+    diffusion_loss: Optional[torch.FloatTensor] = None
+    speech_token_num: Optional[int] = None
+    logits: torch.FloatTensor = None
+    past_key_values: Optional[Tuple[Tuple[torch.FloatTensor]]] = None
+    hidden_states: Optional[Tuple[torch.FloatTensor, ...]] = None
+    attentions: Optional[Tuple[torch.FloatTensor, ...]] = None
+
+
+@dataclass
+class VibeVoiceGenerationOutput(ModelOutput):
+    """
+    Output type for VibeVoice generation.
+    
+    Args:
+        sequences (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
+            The generated sequences. 
+        speech_outputs (`List[torch.FloatTensor]`, *optional*):
+            List of generated speech waveforms or latents for each speech segment.
+    """
+    sequences: torch.LongTensor = None
+    speech_outputs: Optional[List[torch.FloatTensor]] = None
+
+
+class SpeechConnector(nn.Module):
+    def __init__(self, input_dim, output_dim):
+        super().__init__()
+        self.fc1 = nn.Linear(input_dim, output_dim)
+        self.norm = LlamaRMSNorm(output_dim, eps=1e-6)
+        self.fc2 = nn.Linear(output_dim, output_dim)
+
+    def forward(self, features, **kwargs):    
+        x = self.fc1(features)
+        x = self.norm(x)
+        x = self.fc2(x)
+        return x
+
+
+# @auto_docstring
+class VibeVoicePreTrainedModel(PreTrainedModel):
+    config_class = VibeVoiceConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _skip_keys_device_placement = "past_key_values"
+    _supports_cache_class = True
+    _supports_flash_attn_2 = True
+    _supports_sdpa = True
+    _supports_quantized_cache = True
+    _supports_static_cache = True
+    _supports_attention_backend = True
+
+    def _init_weights(self, module):
+        if isinstance(module, VibeVoiceDiffusionHead):
+            module.initialize_weights()
+            return
+
+        # Use the language model's initializer_range if available
+        if hasattr(self.config, 'language_model_config') and hasattr(self.config.language_model_config, 'initializer_range'):
+            std = self.config.language_model_config.initializer_range
+        elif hasattr(self.config, 'decoder_config') and hasattr(self.config.decoder_config, 'initializer_range'):
+            std = self.config.decoder_config.initializer_range
+        else:
+            std = 0.02  # Default value
+            
+        if isinstance(module, nn.Linear):
+            module.weight.data.normal_(mean=0.0, std=std)
+            if module.bias is not None:
+                module.bias.data.zero_()
+        elif isinstance(module, nn.LayerNorm):
+            module.weight.data.fill_(1.0)
+            module.bias.data.zero_()
+
+# @auto_docstring
+class VibeVoiceModel(VibeVoicePreTrainedModel):
+    def __init__(self, config):
+        super().__init__(config)
+        
+        if hasattr(config, 'torch_dtype') and config.torch_dtype is not None:
+            if isinstance(config.torch_dtype, str):
+                dtype = getattr(torch, config.torch_dtype)
+            else:
+                dtype = config.torch_dtype
+        else:
+            dtype = torch.float32
+        
+        # Initialize Qwen2 model for language modeling
+        lm_config = config.decoder_config 
+        self.language_model = AutoModel.from_config(lm_config)
+        
+        # Initialize speech components if needed
+        self.acoustic_tokenizer = AutoModel.from_config(config.acoustic_tokenizer_config).to(dtype)
+        self.semantic_tokenizer = AutoModel.from_config(config.semantic_tokenizer_config).to(dtype)
+
+        self.acoustic_connector = SpeechConnector(config.acoustic_vae_dim, lm_config.hidden_size).to(dtype)
+        self.semantic_connector = SpeechConnector(config.semantic_vae_dim, lm_config.hidden_size).to(dtype)
+        
+        # Register scaling factors as buffers - use 1D tensors for FSDP compatibility
+        self.register_buffer('speech_scaling_factor', torch.tensor(float('nan')))  
+        self.register_buffer('speech_bias_factor', torch.tensor(float('nan')))
+
+        # Initialize prediction head for speech generation
+        self.prediction_head = AutoModel.from_config(config.diffusion_head_config).to(dtype)
+
+        # Initialize noise scheduler
+        self.noise_scheduler = DPMSolverMultistepScheduler(
+            num_train_timesteps=config.diffusion_head_config.ddpm_num_steps,
+            beta_schedule=config.diffusion_head_config.ddpm_beta_schedule,
+            prediction_type=config.diffusion_head_config.prediction_type
+        )
+    
+    def get_input_embeddings(self):
+        if hasattr(self.language_model, 'embed_tokens'):
+            # If the language model has an embed_tokens attribute, return it
+            return self.language_model.embed_tokens
+        
+        for name, attr in self.language_model.fullmap.items(): # parallel by nnscaler, the name is changed
+            if attr.orig_name == 'embed_tokens.weight':
+                return getattr(self.language_model, name)
+        assert False, 'should not arrive here'
+
+    def set_input_embeddings(self, value):
+        self.language_model.embed_tokens = value
+    
+    def set_speech_tokenizers(self, acoustic_tokenizer=None, semantic_tokenizer=None):
+        """Set the speech tokenizers used for encoding and decoding speech."""
+        self.acoustic_tokenizer = acoustic_tokenizer
+        self.semantic_tokenizer = semantic_tokenizer
+        
+        # Reset the encoder to evaluation mode
+        if self.acoustic_tokenizer is not None:
+            self.acoustic_tokenizer.eval()
+            
+        if self.semantic_tokenizer is not None:
+            self.semantic_tokenizer.eval()
+    
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Tuple[Tuple[torch.FloatTensor]]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs,
+    ) -> Union[Tuple, BaseModelOutputWithPast]:
+        
+        return_dict = return_dict if return_dict is not None else self.config.use_return_dict
+        
+        # Forward through language model
+        outputs = self.language_model(
+            input_ids=input_ids,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_hidden_states=output_hidden_states,
+            return_dict=return_dict,
+            cache_position=cache_position,
+            **kwargs,
+        )
+        
+        if not return_dict:
+            return outputs
+            
+        return BaseModelOutputWithPast(
+            last_hidden_state=outputs.last_hidden_state,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+        )
+
+
+class VibeVoiceForConditionalGeneration(VibeVoicePreTrainedModel):
+    _tied_weights_keys = ["lm_head.weight"]
+    _tp_plan = {"lm_head": "colwise_rep"}
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.model = VibeVoiceModel(config)
+        self.vocab_size = config.decoder_config.vocab_size
+        self.lm_head = nn.Linear(config.decoder_config.hidden_size, self.vocab_size, bias=False)
+
+        self.post_init()
+        
+    def get_input_embeddings(self):
+        return self.model.get_input_embeddings()
+
+    def set_input_embeddings(self, value):
+        self.model.set_input_embeddings(value)
+
+    def get_output_embeddings(self):
+        return self.lm_head
+
+    def set_decoder(self, decoder):
+        self.model.language_model = decoder
+
+    def get_decoder(self):
+        return self.model.language_model
+
+    def tie_weights(self):
+        """
+        Tie the weights between the input embeddings and the output embeddings.
+        """
+        if getattr(self.config.decoder_config, 'tie_word_embeddings', False):
+            # The standard PreTrainedModel method will handle the tying.
+            # It typically does a simple parameter object assignment, which is
+            # CORRECT to do BEFORE FSDP wraps the model.
+            output_embeddings = self.get_output_embeddings()
+            input_embeddings = self.get_input_embeddings()
+            if hasattr(input_embeddings, 'weight'):
+                output_embeddings.weight = input_embeddings.weight
+            else:
+                # maybe returned input_embeddings a tensor directly
+                output_embeddings.weight = input_embeddings
+
+            if getattr(output_embeddings, "bias", None) is not None:
+                output_embeddings.bias.data = nn.functional.pad(
+                    output_embeddings.bias.data,
+                    (0, output_embeddings.weight.shape[0] - output_embeddings.bias.shape[0]),
+                    "constant",
+                    0,
+                )
+            print("✅ Tied input and output embeddings using standard assignment.")
+        else:
+            print("ℹ️  tie_word_embeddings is False, not tying weights.")
+
+    # Also, ensure set_output_embeddings is safe, though your implementation looks okay.
+    # The key is to avoid calling it after accelerator.prepare().
+    def set_output_embeddings(self, new_embeddings):
+        # Your current implementation using data.copy_ is good practice,
+        # but the best way is to not call this after prepare().
+        self.lm_head = new_embeddings
+
+    def forward_speech_features(
+            self, 
+            speech_tensors=None, 
+            speech_masks=None, 
+            speech_type="audio", 
+            return_unmask=False
+        ):
+        if speech_tensors is None:
+            # Use config to get vae_dim instead of non-existent self.args
+            vae_dim = self.config.acoustic_tokenizer_config.vae_dim
+            audio_features = torch.zeros(1, 1, vae_dim).to(self.get_input_embeddings().weight)
+            connect_features = self.model.acoustic_connector(audio_features)
+            return audio_features, connect_features
+        else:
+            with torch.no_grad():
+                if speech_type == "audio":
+                    with torch.no_grad():
+                        frames = self.model.acoustic_tokenizer.encode(speech_tensors.unsqueeze(1))[0][0]
+                    audio_tokens = frames.sample(self.model.acoustic_tokenizer.std_dist_type)[0]
+
+                elif speech_type == "vae":
+                    # Use config to get vae_dim instead of non-existent self.args
+                    vae_dim = self.config.acoustic_tokenizer_config.vae_dim
+                    speech_mode = speech_tensors.reshape(speech_tensors.size(0), -1, vae_dim)
+
+                    # gaussian sample from the speech_mode
+                    batch_size = speech_mode.size(0)
+                    value = self.model.acoustic_tokenizer.fix_std / 0.8
+                    std = torch.randn(batch_size, dtype=speech_mode.dtype, device=speech_mode.device) * value
+                    std = std.view(-1, *[1] * (speech_mode.dim() - 1))
+                    audio_tokens = speech_mode + std * torch.randn(speech_mode.shape).to(speech_mode)
+                else:
+                    raise NotImplementedError(f"Speech type {speech_type} not implemented")
+                
+                if torch.isnan(self.model.speech_scaling_factor) or torch.isnan(self.model.speech_bias_factor):
+                    scaling_factor = 1. / audio_tokens[speech_masks].flatten().std()
+                    bias_factor = -audio_tokens[speech_masks].flatten().mean()
+                    
+                    # Only use distributed operations if the process group is initialized
+                    if dist.is_available() and dist.is_initialized():
+                        dist.all_reduce(scaling_factor, op=dist.ReduceOp.SUM)
+                        dist.all_reduce(bias_factor, op=dist.ReduceOp.SUM)
+                        world_size = dist.get_world_size()
+                        self.model.speech_scaling_factor.copy_(scaling_factor / world_size)  
+                        self.model.speech_bias_factor.copy_(bias_factor / world_size)
+                        print(f"Speech scaling factor (distributed): {self.model.speech_scaling_factor}, bias factor: {self.model.speech_bias_factor}", flush=True)
+                    else:
+                        # Single process case
+                        self.model.speech_scaling_factor.copy_(scaling_factor)  
+                        self.model.speech_bias_factor.copy_(bias_factor)
+                        print(f"Speech scaling factor (single process): {self.model.speech_scaling_factor}, bias factor: {self.model.speech_bias_factor}", flush=True)
+                    
+                audio_features = (audio_tokens + self.model.speech_bias_factor) * self.model.speech_scaling_factor
+            
+            connect_features = self.model.acoustic_connector(audio_features)
+            if return_unmask:
+                return audio_features, connect_features
+            return audio_features[speech_masks], connect_features[speech_masks]
+        
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[List[torch.FloatTensor]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = False,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        # New arguments for speech processing and loss calculation
+        speech_tensors: Optional[torch.FloatTensor] = None,
+        speech_masks: Optional[torch.BoolTensor] = None,
+        speeches_loss_input: Optional[torch.FloatTensor] = None,
+        speech_semantic_tensors: Optional[torch.FloatTensor] = None, 
+        acoustic_input_mask: Optional[torch.BoolTensor] = None,
+        acoustic_loss_mask: Optional[torch.BoolTensor] = None,
+        ddpm_batch_mul: int = 1,
+        **kwargs: Optional[Dict[str, Union[torch.Tensor, str]]],
+        ) -> Union[Tuple, VibeVoiceCausalLMOutputWithPast]:
+        
+        return_dict = return_dict if return_dict is not None else self.config.use_return_dict
+        
+        x = self.get_input_embeddings()(input_ids)
+
+        semantic_speech_all_connect_features = self.model.semantic_connector(speech_semantic_tensors)
+        if speeches_loss_input is not None:
+            # only part audio need diffuse
+            speech_all_features, speech_all_connect_features = self.forward_speech_features(
+                    speech_tensors=speech_tensors.type_as(x) if speech_tensors is not None else None,
+                    speech_masks=speech_masks,
+                    speech_type=kwargs.get("speech_type", "audio"),
+                    return_unmask=True
+                )
+            if speech_tensors is not None:
+                if semantic_speech_all_connect_features is not None:
+                    x[acoustic_input_mask] = speech_all_connect_features[speech_masks] + semantic_speech_all_connect_features[speech_masks]
+                else:
+                    x[acoustic_input_mask] = speech_all_connect_features[speech_masks]
+                speech_features = speech_all_features[speeches_loss_input & speech_masks] # only part audio need diffuse
+                speech_connect_features = speech_all_connect_features[speeches_loss_input & speech_masks]
+                # Forward-time consistency check: selected latent count should match number of acoustic placeholders
+                try:
+                    if acoustic_input_mask is not None:
+                        assert speech_connect_features.shape[0] == int(acoustic_input_mask.sum().item()), (
+                            f"Mismatch between selected speech connectors ({speech_connect_features.shape[0]}) and acoustic_input_mask sum ({int(acoustic_input_mask.sum().item())})"
+                        )
+                except Exception:
+                    pass
+        else:
+            speech_features, speech_connect_features = self.forward_speech_features(
+                    speech_tensors=speech_tensors.type_as(x) if speech_tensors is not None else None,
+                    speech_masks=speech_masks,
+                    speech_type=kwargs.get("speech_type", "audio"),
+                )
+            if speech_tensors is not None:
+                x[acoustic_input_mask] = speech_connect_features
+
+        outputs = self.model(
+            input_ids=None,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            inputs_embeds=x,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_hidden_states=False,
+            return_dict=return_dict,
+            cache_position=cache_position,
+        )
+
+        hidden_states = outputs.last_hidden_state
+        logits = self.lm_head(hidden_states)
+        # logits = logits.float()
+
+        loss = None
+        if labels is not None:
+            # The custom CE loss with masking is calculated in the training script.
+            # We leave the standard loss calculation here as None.
+            pass
+
+        # --- Diffusion Loss Calculation ---
+        diffusion_loss = None
+        # This block is executed only if we are in a context that involves speech.
+        if speech_tensors is not None and acoustic_loss_mask.sum().item() > 0:
+            # Build conditioning mask from positions whose NEXT token is a speech latent (shift left by 1)
+            cond_mask = torch.zeros_like(acoustic_loss_mask, dtype=torch.bool)
+            cond_mask[:, :-1] = acoustic_loss_mask[:, 1:]
+            cond_mask[:, 0] = False
+            condition_features = hidden_states[cond_mask]
+            
+            speech_len, latent_size = speech_features.shape
+            # Sanity check: ensure 1:1 alignment between selected conditions and latents
+            try:
+                assert condition_features.shape[0] == speech_len, (
+                    f"Mismatch: condition_features={condition_features.shape[0]} vs speech_features={speech_len}"
+                )
+            except Exception:
+                pass
+            
+            noise = torch.randn(
+                (speech_len * ddpm_batch_mul, latent_size),
+                device=hidden_states.device,
+                dtype=hidden_states.dtype
+            )
+            
+            timesteps = torch.multinomial(
+                torch.ones(self.config.diffusion_head_config.ddpm_num_steps),
+                speech_len * ddpm_batch_mul,
+                replacement=True,
+            ).to(hidden_states.device)
+
+            speech_features_repeated = speech_features.repeat_interleave(ddpm_batch_mul, dim=0)
+            condition_features_repeated = condition_features.repeat_interleave(ddpm_batch_mul, dim=0)
+
+            noisy_speech_features = self.model.noise_scheduler.add_noise(
+                speech_features_repeated, noise, timesteps
+            )
+            
+            model_output = self.model.prediction_head(
+                noisy_speech_features, 
+                timesteps.type_as(x), 
+                condition_features_repeated
+            )
+
+            prediction_type = self.config.diffusion_head_config.prediction_type
+            if prediction_type == "epsilon":
+                target_for_loss = noise
+            elif prediction_type == "v_prediction":
+                target_for_loss = self.model.noise_scheduler.get_velocity(
+                    speech_features_repeated, noise, timesteps
+                )
+            else:
+                raise NotImplementedError(f"Prediction type {prediction_type} not implemented")
+
+            diffusion_loss = F.mse_loss(model_output.float(), target_for_loss.float(), reduction='sum')
+            if latent_size > 0 and ddpm_batch_mul > 0:
+                # Normalize by latent dim, number of sampled diffusion steps per latent, and number of speech tokens
+                diffusion_loss = diffusion_loss / latent_size / ddpm_batch_mul / max(speech_len, 1)
+            else:
+                diffusion_loss = torch.tensor(0.0, device=diffusion_loss.device)
+        
+        else:
+            # Dummy loss for DDP to work when there are no speech samples in a batch,
+            # but we are in a speech context.
+            diffusion_loss = sum(p.sum() for p in self.model.prediction_head.parameters()) * 0.0
+            diffusion_loss += sum(p.sum() for p in self.model.acoustic_connector.parameters()) * 0.0
+            diffusion_loss += sum(p.sum() for p in self.model.semantic_connector.parameters()) * 0.0
+        # --- End Diffusion Loss Calculation ---
+
+        if not return_dict:
+            output = (logits, speech_len) + outputs.to_tuple()[1:]
+            return (loss, diffusion_loss) + output
+
+        return VibeVoiceCausalLMOutputWithPast(
+            loss=loss,
+            diffusion_loss=diffusion_loss,
+            speech_token_num=speech_len if speech_tensors is not None else 0,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+        )
+
+AutoModel.register(VibeVoiceConfig, VibeVoiceModel)
+AutoModelForCausalLM.register(VibeVoiceConfig, VibeVoiceForConditionalGeneration)
+
+__all__ = [
+    "VibeVoiceModel",
+    "VibeVoicePreTrainedModel",
+    "VibeVoiceForConditionalGeneration",
+    "VibeVoiceCausalLMOutputWithPast",
+    "VibeVoiceGenerationOutput",
+]

src/vibevoice/modular/modeling_vibevoice_inference.py

@@ -0,0 +1,715 @@
+from dataclasses import dataclass
+from typing import Dict, List, Optional, Tuple, Union, Callable
+from tqdm import tqdm
+import torch
+import torch.nn as nn
+
+from transformers.models.auto import AutoModel, AutoModelForCausalLM
+
+from transformers.generation import GenerationMixin, GenerationConfig, LogitsProcessor, LogitsProcessorList, StoppingCriteriaList
+from transformers.modeling_outputs import BaseModelOutputWithPast, ModelOutput
+from transformers import modeling_utils
+from transformers.modeling_utils import PreTrainedModel
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.utils import logging
+
+
+# from .modular_vibevoice_tokenizer import VibeVoiceTokenizerStreamingCache, VibeVoiceAcousticTokenizerModel, VibeVoiceSemanticTokenizerModel
+from .modular_vibevoice_tokenizer import VibeVoiceTokenizerStreamingCache, VibeVoiceTokenizerEncoderOutput
+from .modular_vibevoice_diffusion_head import VibeVoiceDiffusionHead
+from vibevoice.schedule.dpm_solver import DPMSolverMultistepScheduler
+
+from .configuration_vibevoice import VibeVoiceConfig
+
+from .modular_vibevoice_text_tokenizer import VibeVoiceTextTokenizer, VibeVoiceTextTokenizerFast
+
+from .modeling_vibevoice import VibeVoiceModel, VibeVoicePreTrainedModel
+from .streamer import AudioStreamer, AsyncAudioStreamer
+
+logger = logging.get_logger(__name__)
+
+if not hasattr(modeling_utils, "ALL_PARALLEL_STYLES") or modeling_utils.ALL_PARALLEL_STYLES is None:
+    modeling_utils.ALL_PARALLEL_STYLES = ["tp", "none", "colwise", "rowwise"]
+
+@dataclass
+class VibeVoiceCausalLMOutputWithPast(BaseModelOutputWithPast):
+    logits: Optional[torch.FloatTensor] = None
+
+@dataclass
+class VibeVoiceGenerationOutput(ModelOutput):
+    """
+    Output type for VibeVoice generation.
+    
+    Args:
+        sequences (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
+            The generated sequences. 
+        speech_outputs (`List[torch.FloatTensor]`, *optional*):
+            List of generated speech waveforms or latents for each speech segment.
+    """
+    sequences: torch.LongTensor = None
+    speech_outputs: Optional[List[torch.FloatTensor]] = None
+    reach_max_step_sample: Optional[torch.BoolTensor] = None
+
+class VibeVoiceTokenConstraintProcessor(LogitsProcessor):
+    """Constrains token generation to only valid tokens during speech generation."""
+    
+    def __init__(self, valid_token_ids: List[int], device: torch.device = None):
+        self.valid_token_ids = torch.tensor(valid_token_ids, dtype=torch.long, device=device)
+        
+    def __call__(self, input_ids: torch.LongTensor, scores: torch.FloatTensor) -> torch.FloatTensor:
+        # Create a mask for valid tokens
+        mask = torch.full_like(scores, float('-inf'))
+        mask[:, self.valid_token_ids] = 0
+        
+        # Apply mask to scores
+        scores = scores + mask
+        return scores
+    
+class VibeVoiceForConditionalGenerationInference(VibeVoicePreTrainedModel, GenerationMixin):
+    _tied_weights_keys = ["lm_head.weight"]
+    _tp_plan = {"lm_head": "colwise_rep"}
+
+    def __init__(self, config):
+        super().__init__(config)
+        
+        # Initialize the base model
+        self.model = VibeVoiceModel(config)
+        
+        # LM head for text generation
+        self.lm_head = nn.Linear(config.decoder_config.hidden_size, config.decoder_config.vocab_size, bias=False)
+        
+        # inference configuration
+        self.ddpm_inference_steps = config.diffusion_head_config.ddpm_num_inference_steps
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    @property
+    def noise_scheduler(self):
+        return self.model.noise_scheduler
+
+    @property
+    def prediction_head(self):
+        return self.model.prediction_head
+    
+    @property
+    def speech_scaling_factor(self):
+        return self.model.speech_scaling_factor
+
+    @property
+    def speech_bias_factor(self):
+        return self.model.speech_bias_factor
+
+    @property
+    def acoustic_tokenizer(self):
+        return self.model.acoustic_tokenizer
+
+    @property
+    def semantic_tokenizer(self):
+        return self.model.semantic_tokenizer
+    
+    @property
+    def acoustic_connector(self):
+        return self.model.acoustic_connector
+
+    @property
+    def semantic_connector(self):
+        return self.model.semantic_connector
+        
+    def tie_weights(self):
+        """
+        Tie the weights between the input embeddings and the output embeddings.
+        """
+        # Tie lm_head.weight to language_model.embed_tokens.weight
+        if not getattr(self.config, 'tie_word_embeddings', False):
+            return
+         
+        if hasattr(self, 'lm_head') and hasattr(self.model.language_model, 'embed_tokens'):
+            self.lm_head.weight = self.model.language_model.embed_tokens.weight
+        
+    def get_input_embeddings(self):
+        return self.model.get_input_embeddings()
+    
+    def set_input_embeddings(self, value):
+        self.model.set_input_embeddings(value)
+    
+    def get_output_embeddings(self):
+        return self.lm_head
+    
+    def set_output_embeddings(self, new_embeddings):
+        self.lm_head = new_embeddings
+    
+    def set_speech_tokenizers(self, acoustic_tokenizer=None, semantic_tokenizer=None):
+        """Set the speech tokenizers used for encoding and decoding speech."""
+        self.model.set_speech_tokenizers(acoustic_tokenizer, semantic_tokenizer)
+    
+    def set_ddpm_inference_steps(self, num_steps=None):
+        self.ddpm_inference_steps = num_steps or self.config.diffusion_head_config.ddpm_num_inference_steps
+
+    def _process_speech_inputs(self, speech_tensors, speech_masks, speech_type="audio"):
+        """Process speech inputs through tokenizers and connectors."""
+        with torch.no_grad():
+            if speech_type == "audio":
+                # Encode audio to acoustic latents
+                encoder_output = self.model.acoustic_tokenizer.encode(speech_tensors.unsqueeze(1))
+                acoustic_latents = encoder_output.sample(dist_type=self.model.acoustic_tokenizer.std_dist_type)[0]
+                
+                # Apply scaling and bias
+                acoustic_features = (acoustic_latents + self.model.speech_bias_factor.to(acoustic_latents.device)) * self.model.speech_scaling_factor.to(acoustic_latents.device)
+                
+                # Connect to language model space
+                acoustic_connected = self.model.acoustic_connector(acoustic_features)[speech_masks.cpu()]
+                
+                return acoustic_features, acoustic_connected
+            elif speech_type == "pt":
+                encoder_output = VibeVoiceTokenizerEncoderOutput(mean=speech_tensors, std=self.acoustic_tokenizer.config.fix_std)
+                acoustic_latents = encoder_output.sample(dist_type=self.model.acoustic_tokenizer.std_dist_type)[0]
+                
+                # Apply scaling and bias
+                acoustic_features = (acoustic_latents + self.model.speech_bias_factor.to(acoustic_latents.device)) * self.model.speech_scaling_factor.to(acoustic_latents.device)
+                
+                # Connect to language model space
+                acoustic_connected = self.model.acoustic_connector(acoustic_features)[speech_masks.cpu()]
+                
+                return acoustic_features, acoustic_connected
+            else:
+                raise NotImplementedError(f"Speech type {speech_type} not implemented")
+    
+    # @can_return_tuple
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Tuple[Tuple[torch.FloatTensor]]] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = None,
+        output_attentions: Optional[bool] = None,
+        output_hidden_states: Optional[bool] = None,
+        return_dict: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        speech_tensors: Optional[torch.FloatTensor] = None,
+        speech_masks: Optional[torch.BoolTensor] = None,
+        speech_input_mask: Optional[torch.BoolTensor] = None,
+        logits_to_keep: Union[int, slice] = 0,
+        **kwargs,
+    ) -> Union[Tuple, VibeVoiceCausalLMOutputWithPast]:
+        """
+        Args:
+            labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
+                Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
+                config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
+                (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.
+            speech_tensors (`torch.FloatTensor`, *optional*):
+                Input speech waveforms for voice cloning or speech understanding.
+            speech_masks (`torch.BoolTensor`, *optional*):
+                Masks indicating valid speech frames.
+            speech_input_mask (`torch.BoolTensor`, *optional*):
+                Positions in the input sequence where speech embeddings should be inserted.
+        
+        Returns:
+            `VibeVoiceCausalLMOutputWithPast` or tuple
+        """
+        return_dict = return_dict if return_dict is not None else self.config.use_return_dict
+        
+        # Get embeddings
+        if inputs_embeds is None:
+            inputs_embeds = self.model.get_input_embeddings()(input_ids)
+        
+        # Process speech inputs if provided
+        if speech_tensors is not None and speech_masks is not None:
+            acoustic_features, speech_embeds = self._process_speech_inputs(speech_tensors.to(self.dtype), speech_masks)
+            if speech_input_mask is not None:
+                inputs_embeds[speech_input_mask] = speech_embeds
+
+        outputs = self.model(
+            inputs_embeds=inputs_embeds,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_hidden_states=output_hidden_states,
+            return_dict=return_dict,
+            cache_position=cache_position,
+            **kwargs,
+        )
+
+        hidden_states = outputs[0] if not return_dict else outputs.last_hidden_state
+        # Only compute necessary logits, and do not upcast them to float if we are not computing the loss
+        slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
+        logits = self.lm_head(hidden_states[:, slice_indices, :])
+                
+        if labels is not None:
+            raise NotImplementedError("Loss computation is not implemented in this version.")
+
+        return VibeVoiceCausalLMOutputWithPast(
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            last_hidden_state=hidden_states,
+            attentions=outputs.attentions,
+        )
+
+    def _build_generate_config_model_kwargs(self, generation_config, inputs, tokenizer, return_processors=False, **kwargs):
+        if generation_config is None:
+            generation_config = GenerationConfig(
+                bos_token_id=tokenizer.bos_token_id,
+                eos_token_id=tokenizer.eos_token_id,
+                pad_token_id = tokenizer.pad_token_id
+            )
+        else:
+            generation_config = GenerationConfig(
+                **generation_config,
+                bos_token_id=tokenizer.bos_token_id,
+                eos_token_id=tokenizer.eos_token_id,
+                pad_token_id = tokenizer.pad_token_id
+            )
+
+        generation_config, model_kwargs = self._prepare_generation_config(
+            generation_config, 
+            True, 
+            speech_start_id=tokenizer.speech_start_id, 
+            speech_end_id=tokenizer.speech_end_id, 
+            speech_diffusion_id=tokenizer.speech_diffusion_id, 
+            **kwargs
+        )
+        generation_config.speech_start_id = tokenizer.speech_start_id
+        generation_config.speech_end_id = tokenizer.speech_end_id
+        generation_config.speech_diffusion_id = tokenizer.speech_diffusion_id
+
+        inputs_tensor, model_input_name, model_kwargs = self._prepare_model_inputs(inputs, generation_config.bos_token_id, model_kwargs)
+        batch_size = inputs_tensor.shape[0]
+        device = self.device
+        
+        self._prepare_special_tokens(generation_config, True, device=device)
+        generation_config.use_cache = True
+        model_kwargs["use_cache"] = generation_config.use_cache
+        input_ids = inputs_tensor.to(self.device)
+
+        input_ids_length = input_ids.shape[1]
+        has_default_max_length = kwargs.get("max_length") is None and generation_config.max_length is not None
+        has_default_min_length = kwargs.get("min_length") is None and generation_config.min_length is not None
+        generation_config = self._prepare_generated_length(
+            generation_config=generation_config,
+            has_default_max_length=has_default_max_length,
+            has_default_min_length=has_default_min_length,
+            model_input_name=model_input_name,
+            inputs_tensor=inputs_tensor,
+            input_ids_length=input_ids_length,
+        )
+
+        max_cache_length = generation_config.max_length - 1
+        self._prepare_cache_for_generation(generation_config, model_kwargs, None, batch_size, max_cache_length, device)
+        model_kwargs['cache_position'] = torch.arange(input_ids_length, device=device, dtype=torch.long)
+        for k, v in model_kwargs.items():
+            if isinstance(v, torch.Tensor):
+                model_kwargs[k] = v.to(device=device)
+        
+        if return_processors:
+            logits_processor = self._get_logits_processor(
+                generation_config=generation_config,
+                input_ids_seq_length=input_ids_length,
+                encoder_input_ids=inputs_tensor,
+                prefix_allowed_tokens_fn=None,
+                logits_processor=LogitsProcessorList(),
+                device=inputs_tensor.device,
+                model_kwargs=model_kwargs,
+            )
+
+            stopping_criteria = self._get_stopping_criteria(generation_config=generation_config, stopping_criteria=StoppingCriteriaList())
+        
+            return generation_config, model_kwargs, input_ids, logits_processor, stopping_criteria
+        else:
+            return generation_config, model_kwargs, input_ids
+        
+    @torch.no_grad()
+    def generate(
+        self,
+        inputs: Optional[torch.Tensor] = None,
+        generation_config: Optional[GenerationConfig] = None,
+        logits_processor: Optional[LogitsProcessorList] = None,
+        stopping_criteria: Optional[StoppingCriteriaList] = None,
+        prefix_allowed_tokens_fn: Optional[Callable[[int, torch.Tensor], List[int]]] = None,
+        synced_gpus: Optional[bool] = None,
+        assistant_model: Optional["PreTrainedModel"] = None,
+        audio_streamer: Optional[Union[AudioStreamer, AsyncAudioStreamer]] = None,
+        negative_prompt_ids: Optional[torch.Tensor] = None,
+        negative_prompt_attention_mask: Optional[torch.Tensor] = None,
+        speech_tensors: Optional[torch.FloatTensor] = None,
+        speech_masks: Optional[torch.BoolTensor] = None,
+        speech_input_mask: Optional[torch.BoolTensor] = None,
+        return_speech: bool = True,
+        cfg_scale: float = 1.0,
+        stop_check_fn: Optional[Callable[[], bool]] = None,
+        **kwargs,
+    ) -> Union[torch.LongTensor, VibeVoiceGenerationOutput]:
+        """
+        Generates sequences of token ids and optionally speech outputs.
+        
+        Args:
+            All standard generation arguments from GenerationMixin
+            negative_prompt_ids: Negative prompt for CFG in speech generation
+            negative_prompt_attention_mask: Attention mask for negative prompt
+            speech_tensors: Input speech for voice cloning
+            speech_masks: Masks for speech tensors  
+            speech_input_mask: Positions to insert speech embeddings
+            return_speech: Whether to decode and return speech outputs
+            cfg_scale: CFG scale for speech generation
+            stop_check_fn: Optional callable that returns True if generation should stop
+ 
+        Returns:
+            Generated token sequences and optionally speech outputs
+        """
+        # 1. Handle `generation_config` and kwargs that might update it, and validate the `.generate()` call
+        tokenizer = kwargs.pop("tokenizer", None)  # Pull this out first, we only use it for stopping criteria
+        parsed_scripts = kwargs.pop("parsed_scripts", None)
+        all_speakers_list = kwargs.pop("all_speakers_list", None)
+        max_length_times = kwargs.pop("max_length_times", 2)
+
+        if kwargs.get('max_new_tokens', None) is None:
+            kwargs['max_new_tokens'] = self.config.decoder_config.max_position_embeddings - kwargs['input_ids'].shape[-1]
+
+        generation_config, model_kwargs, input_ids, logits_processor, stopping_criteria = self._build_generate_config_model_kwargs(
+            generation_config, inputs, tokenizer, return_processors=True, **kwargs
+        )
+        
+        negative_kwargs = {
+            'input_ids': torch.full((kwargs['input_ids'].shape[0], 1), tokenizer.speech_start_id, dtype=torch.long, device=kwargs['input_ids'].device),
+            'attention_mask':  torch.ones((kwargs['input_ids'].shape[0], 1), dtype=torch.long, device=kwargs['input_ids'].device),
+            'max_new_tokens': kwargs.get('max_new_tokens', 100) 
+        }
+        negative_generation_config, negative_model_kwargs, negative_input_ids = self._build_generate_config_model_kwargs(
+            None, None, tokenizer, return_processors=False, **negative_kwargs
+        )
+
+        acoustic_cache = VibeVoiceTokenizerStreamingCache()
+        semantic_cache = VibeVoiceTokenizerStreamingCache()
+        
+        batch_size = input_ids.shape[0]
+        device = input_ids.device
+        finished_tags = torch.zeros(batch_size, dtype=torch.bool, device=device)
+        correct_cnt = torch.zeros(batch_size, dtype=torch.long, device=device)
+        is_prefill = True
+        inputs_embeds = None
+        verbose = kwargs.get("verbose", False)
+
+        # Initialize audio chunks storage for each sample
+        audio_chunks = [[] for _ in range(batch_size)]
+
+        initial_length = input_ids.shape[-1]
+        initial_length_per_sample = model_kwargs['attention_mask'].sum(dim=-1)
+
+       # Define all valid tokens that can be generated
+        valid_tokens = [
+            generation_config.speech_start_id,
+            generation_config.speech_end_id, 
+            generation_config.speech_diffusion_id,
+            generation_config.eos_token_id
+        ]
+        # Add bos_token_id if it exists
+        if hasattr(generation_config, 'bos_token_id') and generation_config.bos_token_id is not None:
+            valid_tokens.append(generation_config.bos_token_id)
+        
+        # Add custom processor to constrain token generation
+        token_constraint_processor = VibeVoiceTokenConstraintProcessor(valid_tokens, device=device)
+        if logits_processor is None:
+            logits_processor = LogitsProcessorList()
+        logits_processor.append(token_constraint_processor)
+        
+        max_steps = min(generation_config.max_length - initial_length, int(max_length_times * initial_length))
+        max_step_per_sample = torch.min(generation_config.max_length - initial_length_per_sample, (max_length_times * initial_length_per_sample).long())
+        reach_max_step_sample = torch.zeros(batch_size, dtype=torch.bool, device=device)
+
+        # Create progress iterator if verbose
+        if kwargs.get("show_progress_bar", True):
+            progress_bar = tqdm(range(max_steps), desc="Generating", leave=False)
+        else:
+            progress_bar = range(max_steps)
+        
+        for step in progress_bar:
+            # Check for external stop signal
+            if stop_check_fn is not None and stop_check_fn():
+                if verbose:
+                    print(f"Generation stopped externally at step {step + 1}")
+                # End the audio streamer if it exists
+                if audio_streamer is not None:
+                    audio_streamer.end()
+                break
+            
+            # Check if audio_streamer has been ended (stopped externally)
+            if audio_streamer is not None and hasattr(audio_streamer, 'finished_flags'):
+                if any(audio_streamer.finished_flags):
+                    if verbose:
+                        print(f"Audio generation stopped externally at step {step + 1}")
+                    break
+            
+            if finished_tags.all():
+                if hasattr(progress_bar, 'set_description'):
+                    progress_bar.set_description("Generation complete")
+                break
+
+            if input_ids.shape[-1] >= generation_config.max_length:
+                print(f"Reached maximum generation length {generation_config.max_length}, stopped it.")
+                reached_samples = torch.arange(batch_size, device=device)[~finished_tags]
+                if reached_samples.numel() > 0:
+                    reach_max_step_sample[reached_samples] = True
+                break
+            
+            # Update progress bar description with active samples
+            if hasattr(progress_bar, 'set_description'):
+                active_samples = (~finished_tags).sum().item()
+                progress_bar.set_description(f"Generating (active: {active_samples}/{batch_size})")
+
+            model_inputs = self.prepare_inputs_for_generation(input_ids, **model_kwargs)
+            if is_prefill:
+                # we process the speech inputs only during the first generation step
+                prefill_inputs = {
+                    "speech_tensors": speech_tensors.to(device=device),
+                    "speech_masks": speech_masks.to(device),
+                    "speech_input_mask": speech_input_mask.to(device),
+                }
+                is_prefill = False
+            else:
+                _ = model_inputs.pop('inputs_embeds', None)
+                prefill_inputs = {'inputs_embeds': inputs_embeds}
+
+            # Forward pass through the model
+            outputs = self(
+                **model_inputs, **prefill_inputs, logits_to_keep=1, return_dict=True, output_attentions=False, output_hidden_states=False,
+            )
+            model_kwargs = self._update_model_kwargs_for_generation(
+                outputs, model_kwargs, is_encoder_decoder=False,
+            )
+
+            # Get logits and apply logits processor
+            next_token_logits = outputs.logits[:, -1, :].to(copy=True, dtype=torch.float32, device=input_ids.device)
+            # next_token_logits = outputs.logits[:, -1, :].to(copy=True, device=input_ids.device)
+            next_token_scores = logits_processor(input_ids, next_token_logits)
+            
+            # token selection
+            if generation_config.do_sample:
+                probs = nn.functional.softmax(next_token_scores, dim=-1)
+                # TODO (joao): this OP throws "skipping cudagraphs due to ['incompatible ops']", find solution
+                next_tokens = torch.multinomial(probs, num_samples=1).squeeze(1)
+            else:
+                next_tokens = torch.argmax(next_token_scores, dim=-1)
+
+            next_tokens[finished_tags] = generation_config.eos_token_id
+            input_ids = torch.cat([input_ids, next_tokens[:, None]], dim=-1)
+            
+            if not kwargs.get('refresh_negative', True):
+                negative_model_inputs = self.prepare_inputs_for_generation(negative_input_ids, **negative_model_kwargs)
+                # Forward negative pass through the model
+                if negative_model_inputs['inputs_embeds'] is None and inputs_embeds is not None:
+                    negative_model_inputs['inputs_embeds'] = inputs_embeds
+                    negative_model_inputs['input_ids'] = None
+
+                negative_outputs = self(
+                    **negative_model_inputs, logits_to_keep=0, return_dict=True, output_attentions=False, output_hidden_states=False,
+                )
+                negative_model_kwargs = self._update_model_kwargs_for_generation(
+                    negative_outputs, negative_model_kwargs, is_encoder_decoder=False,
+                )
+                negative_input_ids = torch.cat([negative_input_ids, next_tokens[:, None]], dim=-1)
+
+            # reached end of generation
+            if (next_tokens == generation_config.eos_token_id).any():
+                eos_indices = (next_tokens == generation_config.eos_token_id).nonzero(as_tuple=False).squeeze(1)
+                # Only print for samples that are newly finished (not already marked as finished)
+                new_eos_indices = eos_indices[~finished_tags[eos_indices]]
+                if new_eos_indices.numel() > 0:
+                    finished_tags[new_eos_indices] = True
+                    if verbose:
+                        print(f"Samples {new_eos_indices.tolist()} reached EOS token at step {step + 1}.", flush=True)
+                    if audio_streamer is not None:
+                        audio_streamer.end(new_eos_indices)
+
+            # Check if any sample reached its maximum generation length
+            max_length_reached = step >= max_step_per_sample
+            new_max_length_indices = torch.nonzero(max_length_reached & ~finished_tags, as_tuple=False).squeeze(1)
+            if new_max_length_indices.numel() > 0:
+                finished_tags[new_max_length_indices] = True
+                reach_max_step_sample[new_max_length_indices] = True
+                if verbose:
+                    print(f"Samples {new_max_length_indices.tolist()} reached max generation length at step {step + 1}.", flush=True)
+                if audio_streamer is not None:
+                    audio_streamer.end(new_max_length_indices)
+
+            # speech_end
+            diffusion_end_indices = (next_tokens == generation_config.speech_end_id).nonzero(as_tuple=False).squeeze(1)
+            if diffusion_end_indices.numel() > 0:
+                # Clear tokenizer caches for samples that reached speech end
+                acoustic_cache.set_to_zero(diffusion_end_indices)
+                semantic_cache.set_to_zero(diffusion_end_indices)
+            
+            # speech_begin
+            diffusion_start_indices = torch.arange(batch_size, device=device)[~finished_tags & (next_tokens == generation_config.speech_start_id)]
+            if diffusion_start_indices.numel() > 0 and kwargs.get('refresh_negative', True):
+                # update attention mask
+                for i, sample_idx in enumerate(diffusion_start_indices.tolist()):
+                    negative_model_kwargs['attention_mask'][sample_idx, :] = 0
+                    negative_model_kwargs['attention_mask'][sample_idx, -1] = 1
+                # update past key values
+                for layer_idx, (k_cache, v_cache) in enumerate(zip(negative_model_kwargs['past_key_values'].key_cache, 
+                                                                        negative_model_kwargs['past_key_values'].value_cache)):
+                    # Process each non-diffusion sample
+                    for sample_idx in diffusion_start_indices.tolist():
+                        # Shift cache for this sample
+                        k_cache[sample_idx, :, -1, :] = k_cache[sample_idx, :, 0, :].clone()
+                        v_cache[sample_idx, :, -1, :] = v_cache[sample_idx, :, 0, :].clone()
+                # update negative_input_ids
+                for sample_idx in diffusion_start_indices.tolist():
+                    negative_input_ids[sample_idx, -1] = generation_config.speech_start_id
+            
+            # Prepare inputs_embeds for next iteration
+            # Initialize with default embeddings for all tokens
+            next_inputs_embeds = self.model.get_input_embeddings()(next_tokens).unsqueeze(1)  # [batch_size, 1, hidden_size]
+            
+            # forward diffusion
+            # Diffusion indices are those that are not finished and not special tokens
+            diffusion_indices = torch.arange(batch_size, device=device)[~finished_tags & (next_tokens == generation_config.speech_diffusion_id)]
+            
+            if diffusion_indices.numel() > 0:
+                if kwargs.get('refresh_negative', True):
+                    negative_model_inputs = self.prepare_inputs_for_generation(negative_input_ids, **negative_model_kwargs)
+                    # Forward negative pass through the model
+                    if negative_model_inputs['inputs_embeds'] is None and inputs_embeds is not None:
+                        negative_model_inputs['inputs_embeds'] = inputs_embeds
+                        negative_model_inputs['input_ids'] = None
+
+                    negative_outputs = self(
+                        **negative_model_inputs, logits_to_keep=0, return_dict=True, output_attentions=False, output_hidden_states=False,
+                    )
+                    negative_model_kwargs = self._update_model_kwargs_for_generation(
+                        negative_outputs, negative_model_kwargs, is_encoder_decoder=False,
+                    )
+                    negative_input_ids = torch.cat([negative_input_ids, next_tokens[:, None]], dim=-1)
+                # correct the non-diffusion indices
+                # we forward all samples' negative outputs even if 
+                #   they are not in diffusion mode to keep the cache consistent
+                # So we need to correct the kv cache of non-diffusion samples
+                non_diffusion_mask = ~finished_tags & (next_tokens != generation_config.speech_diffusion_id)
+                if non_diffusion_mask.any():
+                    non_diffusion_indices = torch.arange(batch_size, device=device)[non_diffusion_mask]
+                    start_indices = correct_cnt[non_diffusion_indices]
+
+                    # 1. Update attention_mask - need to handle each sample separately
+                    seq_len = negative_model_kwargs['attention_mask'].shape[1]
+                    for i, (sample_idx, start_idx) in enumerate(zip(non_diffusion_indices.tolist(), start_indices.tolist())):
+                        # Shift the attention mask for this sample
+                        if start_idx + 1 < seq_len - 1:
+                            negative_model_kwargs['attention_mask'][sample_idx, start_idx+1:] = \
+                                negative_model_kwargs['attention_mask'][sample_idx, start_idx:-1].clone()
+                        negative_model_kwargs['attention_mask'][sample_idx, start_idx] = 0
+
+                    # 2. Update past_key_values
+                    for layer_idx, (k_cache, v_cache) in enumerate(zip(negative_model_kwargs['past_key_values'].key_cache, 
+                                                                        negative_model_kwargs['past_key_values'].value_cache)):
+                        # Process each non-diffusion sample
+                        for sample_idx, start_idx in zip(non_diffusion_indices.tolist(), start_indices.tolist()):
+                            if start_idx + 1 < k_cache.shape[2] - 1:
+                                # Shift cache for this sample
+                                k_cache[sample_idx, :, start_idx+1:, :] = k_cache[sample_idx, :, start_idx:-1, :].clone()
+                                v_cache[sample_idx, :, start_idx+1:, :] = v_cache[sample_idx, :, start_idx:-1, :].clone()
+                    
+                    # 3. Update negative_input_ids
+                    for sample_idx, start_idx in zip(non_diffusion_indices.tolist(), start_indices.tolist()):
+                        if start_idx + 1 < negative_input_ids.shape[1] - 1:
+                            negative_input_ids[sample_idx, start_idx+1:] = \
+                                negative_input_ids[sample_idx, start_idx:-1].clone()
+                                
+                    correct_cnt[non_diffusion_indices] += 1
+
+                positive_condition = outputs.last_hidden_state[diffusion_indices, -1, :]
+                negative_condition = negative_outputs.last_hidden_state[diffusion_indices, -1, :]
+                
+                speech_latent = self.sample_speech_tokens(
+                    positive_condition,
+                    negative_condition,
+                    cfg_scale=cfg_scale,
+                ).unsqueeze(1)
+                                
+                # Decode acoustic latent to audio using acoustic streaming cache
+                scaled_latent = speech_latent / self.model.speech_scaling_factor.to(speech_latent.device) - self.model.speech_bias_factor.to(speech_latent.device)
+                audio_chunk = self.model.acoustic_tokenizer.decode(
+                    scaled_latent.to(self.model.acoustic_tokenizer.device),
+                    cache=acoustic_cache,  # Use acoustic-specific cache
+                    sample_indices=diffusion_indices.to(self.model.acoustic_tokenizer.device),
+                    use_cache=True,
+                    debug=False
+                )
+                
+                # Store audio chunks for each sample
+                for i, sample_idx in enumerate(diffusion_indices):
+                    idx = sample_idx.item()
+                    # Only append audio chunk if the sample is not finished
+                    if not finished_tags[idx]:
+                        audio_chunks[idx].append(audio_chunk[i])
+
+                 # Add streaming support here
+                if audio_streamer is not None:
+                    # Stream the audio chunks immediately
+                    audio_streamer.put(audio_chunk, diffusion_indices)
+                    
+                # Encode audio to semantic features using semantic streaming cache
+                semantic_features = self.model.semantic_tokenizer.encode(
+                    audio_chunk,
+                    cache=semantic_cache,  # Use semantic-specific cache
+                    sample_indices=diffusion_indices,
+                    use_cache=True,
+                    debug=False
+                ).mean # semantic tokenizer has no VAE.
+                
+                # Combine acoustic and semantic features for next input
+                acoustic_embed = self.model.acoustic_connector(speech_latent)
+                semantic_embed = self.model.semantic_connector(semantic_features)
+                diffusion_embeds = acoustic_embed + semantic_embed
+
+                # Update embeddings for diffusion indices
+                next_inputs_embeds[diffusion_indices] = diffusion_embeds
+            
+            # Set inputs_embeds for next iteration
+            inputs_embeds = next_inputs_embeds
+
+        if audio_streamer is not None:
+            audio_streamer.end()
+
+        # Concatenate audio chunks for each sample
+        final_audio_outputs = []
+        for sample_chunks in audio_chunks:
+            if sample_chunks:
+                # Concatenate all chunks along the time dimension (assumed to be the last dimension)
+                concatenated_audio = torch.cat(sample_chunks, dim=-1)
+                final_audio_outputs.append(concatenated_audio)
+            else:
+                # If no audio was generated for this sample, append None
+                final_audio_outputs.append(None)
+
+        return VibeVoiceGenerationOutput(
+            sequences=input_ids,
+            speech_outputs=final_audio_outputs if return_speech else None,
+            reach_max_step_sample=reach_max_step_sample,
+        )
+    
+    @torch.no_grad()
+    def sample_speech_tokens(self, condition, neg_condition, cfg_scale=3.0):
+        self.model.noise_scheduler.set_timesteps(self.ddpm_inference_steps)
+        condition = torch.cat([condition, neg_condition], dim=0).to(self.model.prediction_head.device)
+        speech = torch.randn(condition.shape[0], self.config.acoustic_vae_dim).to(condition)
+        for t in self.model.noise_scheduler.timesteps:
+            half = speech[: len(speech) // 2]
+            combined = torch.cat([half, half], dim=0)
+            eps = self.model.prediction_head(combined, t.repeat(combined.shape[0]).to(combined), condition=condition)
+            cond_eps, uncond_eps = torch.split(eps, len(eps) // 2, dim=0)
+            half_eps = uncond_eps + cfg_scale * (cond_eps - uncond_eps)
+            eps = torch.cat([half_eps, half_eps], dim=0)
+            speech = self.model.noise_scheduler.step(eps, t, speech).prev_sample
+        return speech[: len(speech) // 2]
+    
+
+AutoModelForCausalLM.register(VibeVoiceConfig, VibeVoiceForConditionalGenerationInference)
+
+__all__ = [
+    "VibeVoiceForConditionalGenerationInference",
+]

src/vibevoice/modular/modular_vibevoice_diffusion_head.py

@@ -0,0 +1,287 @@
+import math
+from typing import Optional, Tuple, Union
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+from transformers.models.auto import AutoModel
+from transformers.modeling_utils import PreTrainedModel
+# from transformers.modeling_layers import GradientCheckpointingLayer
+from transformers.activations import ACT2FN
+from transformers.utils import logging
+
+from .configuration_vibevoice import VibeVoiceDiffusionHeadConfig
+
+
+logger = logging.get_logger(__name__)
+
+
+class RMSNorm(nn.Module):
+    def __init__(self, dim: int, eps: float = 1e-6, elementwise_affine=True, memory_efficient=False):
+        super().__init__()
+        self.dim = dim
+        self.eps = eps
+        self.elementwise_affine = elementwise_affine
+        if self.elementwise_affine:
+            self.weight = nn.Parameter(torch.ones(dim))
+        else:
+            self.register_parameter('weight', None)
+
+    def _norm(self, x):
+        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)
+
+    def forward(self, x):
+        output = self._norm(x.float()).type_as(x)
+        if self.weight is not None:
+            output = output * self.weight
+        return output
+
+    def extra_repr(self) -> str:
+        return f'dim={self.dim}, eps={self.eps}, elementwise_affine={self.elementwise_affine}'
+    
+def modulate(x, shift, scale):
+    """Apply modulation to input tensor."""
+    return x * (1 + scale) + shift
+
+
+class TimestepEmbedder(nn.Module):
+    """
+    Embeds scalar timesteps into vector representations.
+    
+    Args:
+        hidden_size (`int`): Size of the output embedding
+        frequency_embedding_size (`int`, optional): Size of the intermediate frequency embedding
+    """
+    def __init__(self, hidden_size, frequency_embedding_size=256):
+        super().__init__()
+        self.mlp = nn.Sequential(
+            nn.Linear(frequency_embedding_size, hidden_size, bias=False),
+            # nn.SiLU(),
+            ACT2FN['silu'],
+            nn.Linear(hidden_size, hidden_size, bias=False),
+        )
+        self.frequency_embedding_size = frequency_embedding_size
+
+    @staticmethod
+    def timestep_embedding(t, dim, max_period=10000):
+        """
+        Create sinusoidal timestep embeddings.
+        
+        Args:
+            t (`torch.Tensor`): A 1-D Tensor of N indices, one per batch element.
+                            These may be fractional.
+            dim (`int`): The dimension of the output.
+            max_period (`int`, optional): Controls the minimum frequency of the embeddings.
+            
+        Returns:
+            `torch.Tensor`: An [N, D] Tensor of positional embeddings.
+        """
+        half = dim // 2
+        freqs = torch.exp(
+            -math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32) / half
+        ).to(t.device)
+        args = t[:, None].float() * freqs[None]
+        embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
+        if dim % 2:
+            embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
+        return embedding.to(t.dtype)
+
+    def forward(self, t):
+        t_freq = self.timestep_embedding(t, self.frequency_embedding_size)
+        t_emb = self.mlp(t_freq)
+        return t_emb
+
+
+class FeedForwardNetwork(nn.Module):
+    """
+    Standard feed-forward network with SwiGLU activation.
+    
+    Args:
+        embed_dim (`int`): Input dimension
+        ffn_dim (`int`): Hidden dimension
+    """
+    def __init__(
+        self,
+        embed_dim,
+        ffn_dim,
+    ):
+        super().__init__()
+        self.embed_dim = embed_dim
+        self.gate_proj = nn.Linear(self.embed_dim, ffn_dim, bias=False)
+        self.up_proj = nn.Linear(self.embed_dim, ffn_dim, bias=False)
+        self.down_proj = nn.Linear(ffn_dim, self.embed_dim, bias=False)
+        self.act_fn = ACT2FN['silu']  # Using SiLU as the activation function
+
+    def forward(self, x):
+        gate = self.gate_proj(x)
+        up = self.up_proj(x)
+        
+        # SwiGLU activation
+        # gate = F.silu(gate)
+        gate = self.act_fn(gate)
+        return self.down_proj(gate * up)
+
+    
+class HeadLayer(nn.Module):
+    """
+    A layer in the diffusion head.
+    
+    Args:
+        embed_dim (`int`): Input dimension
+        ffn_dim (`int`): Hidden dimension
+        cond_dim (`int`): Condition embedding dimension
+        norm_eps (`float`, optional): Epsilon for normalization
+    """
+    def __init__(
+        self,
+        embed_dim,
+        ffn_dim,
+        cond_dim,
+        norm_eps=1e-5,
+    ):
+        super().__init__()
+        self.embed_dim = embed_dim
+        self.cond_dim = cond_dim
+        self.ffn_dim = ffn_dim
+        self.ffn = FeedForwardNetwork(
+            self.embed_dim,
+            self.ffn_dim,
+        )
+        self.norm = RMSNorm(self.embed_dim, eps=norm_eps)
+        self.adaLN_modulation = nn.Sequential(
+            # nn.SiLU(),
+            ACT2FN['silu'],
+            nn.Linear(cond_dim, 3 * self.embed_dim, bias=False)
+        )
+
+    def forward(self, x, c):
+        shift_ffn, scale_ffn, gate_ffn = self.adaLN_modulation(c).chunk(3, dim=-1)
+        x = x + gate_ffn * self.ffn(modulate(self.norm(x), shift_ffn, scale_ffn))
+        return x
+
+
+class FinalLayer(nn.Module):
+    """
+    Final layer in the diffusion head.
+    
+    Args:
+        hidden_size (`int`): Input dimension
+        output_size (`int`): Output dimension
+        cond_size (`int`): Condition embedding dimension
+        norm_eps (`float`, optional): Epsilon for normalization
+    """
+    def __init__(self, hidden_size, output_size, cond_size, norm_eps=1e-5):
+        super().__init__()
+        self.norm_final = RMSNorm(hidden_size, eps=norm_eps, elementwise_affine=False)
+        self.linear = nn.Linear(hidden_size, output_size, bias=False)
+        self.adaLN_modulation = nn.Sequential(
+            # nn.SiLU(),
+            ACT2FN['silu'],
+            nn.Linear(cond_size, 2 * hidden_size, bias=False)
+        )
+
+    def forward(self, x, c):
+        shift, scale = self.adaLN_modulation(c).chunk(2, dim=-1)
+        x = modulate(self.norm_final(x), shift, scale)
+        x = self.linear(x)
+        return x
+
+
+class VibeVoiceDiffusionHead(PreTrainedModel):
+    """
+    Diffusion head model for vibevoice.
+    
+    Args:
+        config (`VibeVoiceDiffusionHeadConfig`): Model configuration
+        latent_size (`int`, optional): Size of the latent space. If not provided, uses `config.latent_size`.
+    """
+    config_class = VibeVoiceDiffusionHeadConfig
+    supports_gradient_checkpointing = True
+    _supports_flash_attn_2 = True  
+    _supports_sdpa = True  
+    
+    def __init__(
+        self,
+        config,
+    ):
+        super().__init__(config)
+        self.config = config
+        self.cond_dim = config.hidden_size
+        latent_size = config.latent_size
+        
+        self.noisy_images_proj = nn.Linear(latent_size, config.hidden_size, bias=False)
+        self.cond_proj = nn.Linear(config.hidden_size, self.cond_dim, bias=False)
+        self.t_embedder = TimestepEmbedder(self.cond_dim)
+        
+        ffn_dim = int(config.hidden_size * config.head_ffn_ratio)
+        
+        # Create the intermediate layers
+        self.layers = nn.ModuleList([
+            HeadLayer(
+                embed_dim=config.hidden_size,
+                ffn_dim=ffn_dim,
+                cond_dim=self.cond_dim,
+                norm_eps=config.rms_norm_eps
+            )
+            for _ in range(config.head_layers)
+        ])
+        
+        # Final layer for output
+        self.final_layer = FinalLayer(
+            hidden_size=config.hidden_size, 
+            output_size=latent_size,
+            cond_size=self.cond_dim,
+            norm_eps=config.rms_norm_eps
+        )
+        
+        self.initialize_weights()
+
+    def initialize_weights(self):
+        """Initialize the weights of the model."""
+        # Initialize timestep embedder
+        nn.init.normal_(self.t_embedder.mlp[0].weight, std=0.02)
+        nn.init.normal_(self.t_embedder.mlp[2].weight, std=0.02)
+
+        # Zero-out adaLN modulation layers
+        for layer in self.layers:
+            nn.init.constant_(layer.adaLN_modulation[-1].weight, 0)
+
+        # Zero-out output layers
+        nn.init.constant_(self.final_layer.adaLN_modulation[-1].weight, 0)
+        nn.init.constant_(self.final_layer.linear.weight, 0)
+
+    def forward(
+        self,
+        noisy_images,
+        timesteps,
+        condition,
+    ):
+        """
+        Forward pass of the prediction head.
+        
+        Args:
+            noisy_images (`torch.Tensor`): Noisy images/latents to denoise
+            timesteps (`torch.Tensor`): Timesteps for diffusion
+            condition (`torch.Tensor`): Conditioning information
+            
+        Returns:
+            `torch.Tensor`: The predicted noise/velocity
+        """
+        x = self.noisy_images_proj(noisy_images)
+        t = self.t_embedder(timesteps)
+        condition = self.cond_proj(condition)
+        c = condition + t
+        
+        for layer in self.layers:
+            x = layer(x, c)
+            
+        x = self.final_layer(x, c)
+        return x
+
+
+AutoModel.register(VibeVoiceDiffusionHeadConfig, VibeVoiceDiffusionHead)
+
+__all__ = [
+    "VibeVoiceDiffusionHead",
+]

src/vibevoice/modular/modular_vibevoice_text_tokenizer.py

@@ -0,0 +1,214 @@
+"""Tokenization classes for vibevoice."""
+
+from typing import List, Optional, Union
+
+from transformers.utils import logging
+from transformers.models.qwen2.tokenization_qwen2 import Qwen2Tokenizer
+from transformers.models.qwen2.tokenization_qwen2_fast import Qwen2TokenizerFast
+
+logger = logging.get_logger(__name__)
+
+
+class VibeVoiceTextTokenizer(Qwen2Tokenizer):
+    """
+    Construct a VibeVoice tokenizer. Based on the Qwen2 tokenizer with additional special tokens for speech.
+    
+    Args:
+        vocab_file (`str`):
+            Path to the vocabulary file.
+        merges_file (`str`):
+            Path to the merges file.
+        errors (`str`, *optional*, defaults to `"replace"`):
+            Paradigm to follow when decoding bytes to UTF-8.
+        unk_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The unknown token.
+        bos_token (`str`, *optional*):
+            The beginning of sequence token. Not used for vibevoice.
+        eos_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The end of sequence token.
+        pad_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The token used for padding.
+        add_special_tokens (`bool`, *optional*, defaults to `True`):
+            Whether or not to add special tokens when encoding.
+    """
+
+    model_input_names = ["input_ids", "attention_mask"]
+
+    def __init__(
+        self,
+        vocab_file,
+        merges_file,
+        errors="replace",
+        unk_token="<|endoftext|>",
+        bos_token=None,
+        eos_token="<|endoftext|>",
+        pad_token="<|endoftext|>",
+        add_prefix_space=False,
+        add_special_tokens=True,
+        **kwargs,
+    ):
+        super().__init__(
+            vocab_file=vocab_file,
+            merges_file=merges_file,
+            errors=errors,
+            unk_token=unk_token,
+            bos_token=bos_token,
+            eos_token=eos_token,
+            pad_token=pad_token,
+            add_prefix_space=add_prefix_space,
+            add_special_tokens=add_special_tokens,
+            **kwargs,
+        )
+        
+        # Add VibeVoice-specific special tokens
+        self._add_vibevoice_special_tokens()
+        
+    def _add_vibevoice_special_tokens(self):
+        """Add VibeVoice-specific special tokens."""
+        special_tokens = {
+            "additional_special_tokens": [
+                "<|vision_start|>",  # Speech start (reusing vision tokens)
+                "<|vision_end|>",  # Speech end
+                "<|vision_pad|>",  # Speech diffusion pad
+            ]
+        }
+        num_added = self.add_special_tokens(special_tokens)
+        
+        # Cache special token IDs
+        self._speech_start_id = self.convert_tokens_to_ids("<|vision_start|>")
+        self._speech_end_id = self.convert_tokens_to_ids("<|vision_end|>")
+        self._speech_diffusion_id = self.convert_tokens_to_ids("<|vision_pad|>")
+        
+        self._eos_id = self.convert_tokens_to_ids('<|endoftext|>')
+
+        return num_added
+    
+    @property
+    def eos_id(self) -> int:
+        """Id of the end of sequence token."""
+        return self._eos_id
+    
+    @property
+    def speech_start_id(self) -> int:
+        """Id of the speech start token."""
+        return self._speech_start_id
+    
+    @property
+    def speech_end_id(self) -> int:
+        """Id of the speech end token."""
+        return self._speech_end_id
+    
+    @property
+    def speech_diffusion_id(self) -> int:
+        """Id of the speech diffusion token."""
+        return self._speech_diffusion_id
+    
+    @property
+    def pad_id(self) -> int:
+        """Id used for padding (returns -100 for loss masking)."""
+        return -100
+
+
+class VibeVoiceTextTokenizerFast(Qwen2TokenizerFast):
+    """
+    Construct a "fast" VibeVoice tokenizer (backed by HuggingFace's *tokenizers* library).
+    Based on the Qwen2 tokenizer with additional special tokens for speech.
+    
+    Args:
+        vocab_file (`str`, *optional*):
+            Path to the vocabulary file.
+        merges_file (`str`, *optional*):
+            Path to the merges file.
+        tokenizer_file (`str`, *optional*):
+            Path to [tokenizers](https://github.com/huggingface/tokenizers) file.
+        unk_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The unknown token.
+        bos_token (`str`, *optional*):
+            The beginning of sequence token. Not used for vibevoice.
+        eos_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The end of sequence token.
+        pad_token (`str`, *optional*, defaults to `"<|endoftext|>"`):
+            The token used for padding.
+    """
+
+    model_input_names = ["input_ids", "attention_mask"]
+
+    def __init__(
+        self,
+        vocab_file=None,
+        merges_file=None,
+        tokenizer_file=None,
+        unk_token="<|endoftext|>",
+        bos_token=None,
+        eos_token="<|endoftext|>",
+        pad_token="<|endoftext|>",
+        add_prefix_space=False,
+        **kwargs,
+    ):
+        super().__init__(
+            vocab_file=vocab_file,
+            merges_file=merges_file,
+            tokenizer_file=tokenizer_file,
+            unk_token=unk_token,
+            bos_token=bos_token,
+            eos_token=eos_token,
+            pad_token=pad_token,
+            add_prefix_space=add_prefix_space,
+            **kwargs,
+        )
+        
+        # Add VibeVoice-specific special tokens
+        self._add_vibevoice_special_tokens()
+        
+    def _add_vibevoice_special_tokens(self):
+        """Add VibeVoice-specific special tokens."""
+        special_tokens = {
+            "additional_special_tokens": [
+                "<|vision_start|>",  # Speech start (reusing vision tokens)
+                "<|vision_end|>",  # Speech end
+                "<|vision_pad|>",  # Speech diffusion pad
+            ]
+        }
+        num_added = self.add_special_tokens(special_tokens)
+        
+        # Cache special token IDs
+        self._speech_start_id = self.convert_tokens_to_ids("<|vision_start|>")
+        self._speech_end_id = self.convert_tokens_to_ids("<|vision_end|>")
+        self._speech_diffusion_id = self.convert_tokens_to_ids("<|vision_pad|>")
+
+        # self._eos_id = self.convert_tokens_to_ids('<|endoftext|>')
+        self._eos_id = self.eos_token_id # qwen2 / qwen3
+        self._pad_id = self.convert_tokens_to_ids('<|image_pad|>')
+        
+        return num_added
+    
+    @property
+    def eos_id(self) -> int:
+        """Id of the end of sequence token."""
+        return self._eos_id
+    
+    @property
+    def speech_start_id(self) -> int:
+        """Id of the speech start token."""
+        return self._speech_start_id
+    
+    @property
+    def speech_end_id(self) -> int:
+        """Id of the speech end token."""
+        return self._speech_end_id
+    
+    @property
+    def speech_diffusion_id(self) -> int:
+        """Id of the speech diffusion token."""
+        return self._speech_diffusion_id
+    
+    @property
+    def pad_id(self) -> int:
+        """Id used for padding (returns -100 for loss masking)."""
+        return self._pad_id
+
+
+__all__ = [
+    "VibeVoiceTextTokenizer", 
+    "VibeVoiceTextTokenizerFast", 
+]

src/vibevoice/modular/modular_vibevoice_tokenizer.py

@@ -0,0 +1,1195 @@
+import math
+import typing as tp
+from functools import partial
+from dataclasses import dataclass, field
+from typing import Dict, List, Optional, Tuple, Union
+import copy
+
+import numpy as np
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+from transformers.models.auto import AutoModel
+
+from transformers.configuration_utils import PretrainedConfig
+from transformers.utils import logging
+from transformers.modeling_utils import PreTrainedModel
+from transformers.activations import ACT2FN
+
+from .configuration_vibevoice import VibeVoiceAcousticTokenizerConfig, VibeVoiceSemanticTokenizerConfig
+
+logger = logging.get_logger(__name__)
+
+import os
+# Try to import APEX FusedRMSNorm
+try:
+    from apex.normalization.fused_layer_norm import fused_rms_norm_affine
+    APEX_AVAILABLE = True
+    logger.info("APEX FusedRMSNorm is available and will be used for optimization")
+    if int(os.getenv("OPTIMIZE_FOR_SPEED", "0")) == 0:
+        APEX_AVAILABLE = False
+        logger.warning("APEX FusedRMSNorm is disabled by environment variable OPTIMIZE_FOR_SPEED=0")
+except ImportError:
+    APEX_AVAILABLE = False
+    logger.warning("APEX FusedRMSNorm not available, using native implementation")
+# APEX_AVAILABLE=False
+
+# Normalization modules
+class ConvLayerNorm(nn.LayerNorm):
+    """
+    Convolution-friendly LayerNorm that moves channels to last dimensions
+    before running the normalization and moves them back to original position right after.
+    """
+    def __init__(self, normalized_shape: tp.Union[int, tp.List[int], torch.Size], **kwargs):
+        super().__init__(normalized_shape, **kwargs)
+
+    def forward(self, x):
+        x = x.transpose(1, 2)  # b ... t -> b t ...
+        x = nn.functional.layer_norm(x.float(), self.normalized_shape, self.weight.float(), self.bias.float(), self.eps).type_as(x) 
+        x = x.transpose(1, 2)  # b t ... -> b ... t
+        return x
+    
+class RMSNorm(nn.Module):
+    def __init__(self, dim: int, eps: float = 1e-5, elementwise_affine=True, weight_shape=None):
+        super().__init__()
+        self.dim = dim
+        self.eps = eps
+        self.elementwise_affine = elementwise_affine
+        if self.elementwise_affine:
+            weight_shape = (dim,) if weight_shape is None else weight_shape
+            self.weight = nn.Parameter(torch.ones(weight_shape))
+        else:
+            self.register_parameter('weight', None)
+
+    def _norm(self, x):
+        return x * torch.rsqrt(x.pow(2).mean(-1, keepdim=True) + self.eps)
+
+    def forward(self, x):
+        output = self._norm(x.float()).type_as(x)
+        if self.weight is not None:
+            output = output * self.weight
+        return output
+
+    def extra_repr(self) -> str:
+        return f'dim={self.dim}, eps={self.eps}, elementwise_affine={self.elementwise_affine}'
+
+class ConvRMSNorm(RMSNorm):
+    def __init__(self, dim: int, eps: float = 1e-5, elementwise_affine=True, weight_shape=None):
+        super().__init__(dim, eps, elementwise_affine, weight_shape)
+
+    def forward(self, x):
+        x = x.transpose(1, 2)  # b ... t -> b t ...
+        if (not APEX_AVAILABLE) or (not self.elementwise_affine):
+            # Fallback to native implementation
+            output = self._norm(x.float()).type_as(x)
+            if self.weight is not None:
+                output = output * self.weight
+        else:
+            output = fused_rms_norm_affine(x, self.weight, self.weight.shape, self.eps)
+        output = output.transpose(1, 2)  # b t ... -> b ... t
+        return output
+
+# Convolutional layers and utilities
+CONV_NORMALIZATIONS = frozenset(['none', 'weight_norm', 'spectral_norm',
+                                'time_layer_norm', 'layer_norm', 'time_group_norm'])
+
+
+def apply_parametrization_norm(module: nn.Module, norm: str = 'none') -> nn.Module:
+    assert norm in CONV_NORMALIZATIONS
+    if norm == 'weight_norm':
+        return nn.utils.weight_norm(module)
+    elif norm == 'spectral_norm':
+        return nn.utils.spectral_norm(module)
+    else:
+        # We already check was in CONV_NORMALIZATION, so any other choice
+        # doesn't need reparametrization.
+        return module
+
+
+def get_norm_module(module: nn.Module, causal: bool = False, norm: str = 'none', **norm_kwargs) -> nn.Module:
+    """Return the proper normalization module. If causal is True, this will ensure the returned
+    module is causal, or return an error if the normalization doesn't support causal evaluation.
+    """
+    assert norm in CONV_NORMALIZATIONS
+    if norm == 'layer_norm':
+        assert isinstance(module, nn.modules.conv._ConvNd)
+        return ConvLayerNorm(module.out_channels, **norm_kwargs)
+    elif norm == 'time_group_norm':
+        if causal:
+            raise ValueError("GroupNorm doesn't support causal evaluation.")
+        assert isinstance(module, nn.modules.conv._ConvNd)
+        return nn.GroupNorm(1, module.out_channels, **norm_kwargs)
+    else:
+        return nn.Identity()
+
+
+def get_extra_padding_for_conv1d(x: torch.Tensor, kernel_size: int, stride: int,
+                                padding_total: int = 0) -> int:
+    """Calculate extra padding needed for convolution to have the same output length"""
+    length = x.shape[-1]
+    n_frames = (length - kernel_size + padding_total) / stride + 1
+    ideal_length = (math.ceil(n_frames) - 1) * stride + (kernel_size - padding_total)
+    return ideal_length - length
+
+
+def pad1d(x: torch.Tensor, paddings: tp.Tuple[int, int], mode: str = 'zero', value: float = 0.):
+    """Pad 1D input with handling for small inputs in reflect mode"""
+    length = x.shape[-1]
+    padding_left, padding_right = paddings
+    assert padding_left >= 0 and padding_right >= 0, (padding_left, padding_right)
+    if mode == 'reflect':
+        max_pad = max(padding_left, padding_right)
+        extra_pad = 0
+        if length <= max_pad:
+            extra_pad = max_pad - length + 1
+            x = F.pad(x, (0, extra_pad))
+        padded = F.pad(x, paddings, mode, value)
+        end = padded.shape[-1] - extra_pad
+        return padded[..., :end]
+    else:
+        return F.pad(x, paddings, mode, value)
+
+
+def unpad1d(x: torch.Tensor, paddings: tp.Tuple[int, int]):
+    """Remove padding from x, handling properly zero padding. Only for 1d!"""
+    padding_left, padding_right = paddings
+    assert padding_left >= 0 and padding_right >= 0, (padding_left, padding_right)
+    assert (padding_left + padding_right) <= x.shape[-1]
+    end = x.shape[-1] - padding_right
+    return x[..., padding_left: end]
+
+
+class NormConv1d(nn.Module):
+    """Wrapper around Conv1d and normalization applied to this conv"""
+    def __init__(self, *args, causal: bool = False, norm: str = 'none',
+                norm_kwargs: tp.Dict[str, tp.Any] = {}, **kwargs):
+        super().__init__()
+        self.conv = apply_parametrization_norm(nn.Conv1d(*args, **kwargs), norm)
+        self.norm = get_norm_module(self.conv, causal, norm, **norm_kwargs)
+        self.norm_type = norm
+
+    def forward(self, x):
+        x = self.conv(x)
+        x = self.norm(x)
+        return x
+
+
+class NormConvTranspose1d(nn.Module):
+    """Wrapper around ConvTranspose1d and normalization applied to this conv"""
+    def __init__(self, *args, causal: bool = False, norm: str = 'none',
+                norm_kwargs: tp.Dict[str, tp.Any] = {}, **kwargs):
+        super().__init__()
+        self.convtr = apply_parametrization_norm(nn.ConvTranspose1d(*args, **kwargs), norm)
+        self.norm = get_norm_module(self.convtr, causal, norm, **norm_kwargs)
+        self.norm_type = norm
+
+    def forward(self, x):
+        x = self.convtr(x)
+        x = self.norm(x)
+        return x
+
+
+class VibeVoiceTokenizerStreamingCache:
+    """Cache for streaming convolution, similar to KV cache in attention"""
+    def __init__(self):
+        self.cache = {}  # Dict mapping (layer_id, sample_idx) to state tensor
+        
+    def get(self, layer_id: str, sample_indices: torch.Tensor) -> Optional[torch.Tensor]:
+        """Get cached states for given layer and sample indices"""
+        states = []
+        max_length = 0
+        
+        # First pass: collect states and find max length
+        for idx in sample_indices.tolist():
+            key = (layer_id, idx)
+            if key not in self.cache:
+                return None  # If any sample is missing, return None
+            state = self.cache[key]
+            states.append(state)
+            max_length = max(max_length, state.shape[-1])
+        
+        # Second pass: pad states to max length if needed
+        if len(states) > 0 and states[0].dim() >= 2:
+            padded_states = []
+            for state in states:
+                if state.shape[-1] < max_length:
+                    # Pad on the time dimension (last dimension)
+                    pad_size = max_length - state.shape[-1]
+                    # Pad with zeros on the LEFT to align the most recent samples
+                    padded_state = F.pad(state, (pad_size, 0), mode='constant', value=0)
+                    padded_states.append(padded_state)
+                else:
+                    padded_states.append(state)
+            return torch.stack(padded_states, dim=0)
+        else:
+            return torch.stack(states, dim=0)
+    
+    def set(self, layer_id: str, sample_indices: torch.Tensor, states: torch.Tensor):
+        """Set cached states for given layer and sample indices"""
+        for i, idx in enumerate(sample_indices.tolist()):
+            key = (layer_id, idx)
+            self.cache[key] = states[i].detach()
+
+    def set_to_zero(self, sample_indices: torch.Tensor):
+        """Set all cached states to zero for given sample indices"""
+        for key in list(self.cache.keys()):
+            layer_id, sample_idx = key
+            if sample_idx in sample_indices.tolist():
+                # Create zero tensor with same shape and dtype as cached tensor
+                cached_tensor = self.cache[key]
+                self.cache[key] = torch.zeros_like(cached_tensor)
+                
+    def clear(self, layer_id: Optional[str] = None, sample_indices: Optional[torch.Tensor] = None):
+        """Clear cache for specific layer/samples or everything"""
+        if layer_id is None and sample_indices is None:
+            self.cache.clear()
+        elif layer_id is not None and sample_indices is None:
+            # Clear all samples for a specific layer
+            keys_to_remove = [k for k in self.cache.keys() if k[0] == layer_id]
+            for k in keys_to_remove:
+                del self.cache[k]
+        elif layer_id is not None and sample_indices is not None:
+            # Clear specific samples for a specific layer
+            for idx in sample_indices.tolist():
+                key = (layer_id, idx)
+                self.cache.pop(key, None)
+
+class SConv1d(nn.Module):
+    """Conv1d with built-in handling of asymmetric or causal padding and normalization."""
+    def __init__(self, in_channels: int, out_channels: int,
+                kernel_size: int, stride: int = 1, dilation: int = 1,
+                groups: int = 1, bias: bool = True, causal: bool = False,
+                norm: str = 'none', norm_kwargs: tp.Dict[str, tp.Any] = {},
+                pad_mode: str = 'reflect'):
+        super().__init__()
+        self.conv = NormConv1d(in_channels, out_channels, kernel_size, stride,
+                            dilation=dilation, groups=groups, bias=bias, causal=causal,
+                            norm=norm, norm_kwargs=norm_kwargs)
+        self.causal = causal
+        self.pad_mode = pad_mode
+        
+        # Store configuration
+        self.kernel_size = kernel_size
+        self.dilation = dilation
+        self.stride = stride
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        
+        # For causal convolution, we need to maintain kernel_size - 1 samples as context
+        # need to check use which context_size is more suitable
+        # self.context_size = (kernel_size - 1) * dilation
+        self.context_size = (kernel_size - 1) * dilation - (stride - 1)
+        
+        # For non-streaming mode, calculate padding
+        self.padding_total = (kernel_size - 1) * dilation - (stride - 1)
+        
+        # Create a unique layer ID for cache management
+        self._layer_id = None
+                  
+    @property
+    def layer_id(self):
+        if self._layer_id is None:
+            self._layer_id = f"sconv1d_{id(self)}"
+        return self._layer_id
+        
+    def forward(self, x: torch.Tensor, 
+                cache: Optional[VibeVoiceTokenizerStreamingCache] = None,
+                sample_indices: Optional[torch.Tensor] = None,
+                use_cache: bool = False,
+                debug: bool = False) -> torch.Tensor:
+        """
+        Forward pass with optional streaming support via cache.
+        
+        Args:
+            x: Input tensor [batch_size, channels, time]
+            cache: VibeVoiceTokenizerStreamingCache object for maintaining states
+            sample_indices: Indices identifying each sample for cache management
+            use_cache: Whether to use cached states for streaming
+            debug: Whether to print debug information
+            
+        Returns:
+            Output tensor
+        """
+        B, C, T = x.shape
+        
+        # Non-streaming mode
+        if not use_cache or cache is None:
+            return self._forward_non_streaming(x, debug=debug)
+        
+        # Streaming mode
+        assert self.causal, "Streaming mode is only supported for causal convolutions"
+        assert sample_indices is not None, "sample_indices must be provided for streaming mode"
+        assert len(sample_indices) == B, "sample_indices must match batch size"
+        
+        return self._forward_streaming(x, cache, sample_indices, debug)
+    
+    def _forward_streaming(self, x: torch.Tensor, 
+                          cache: VibeVoiceTokenizerStreamingCache,
+                          sample_indices: torch.Tensor,
+                          debug: bool = False) -> torch.Tensor:
+        """Streaming forward pass with cache operations kept separate from compiled code"""
+        B, C, T = x.shape
+        
+        # Cache operations (not compiled)
+        cached_states = cache.get(self.layer_id, sample_indices)
+        
+        if cached_states is None:
+            # First chunk - initialize with zeros for context
+            if self.context_size > 0:
+                cached_states = torch.zeros(B, C, self.context_size, device=x.device, dtype=x.dtype)
+                if debug:
+                    print(f"[DEBUG] Initialized cache with shape: {cached_states.shape}, context_size={self.context_size}")
+            else:
+                cached_states = torch.zeros(B, C, 0, device=x.device, dtype=x.dtype)
+                if debug:
+                    print(f"[DEBUG] No context needed (kernel_size=stride)")
+        
+        # Concatenate cached states with input
+        if cached_states.shape[2] > 0:
+            input_with_context = torch.cat([cached_states, x], dim=2)
+        else:
+            input_with_context = x
+            
+        if debug:
+            print(f"[DEBUG] Input shape: {x.shape}, Cache shape: {cached_states.shape}, Combined: {input_with_context.shape}")
+        
+        # Apply convolution directly - no extra padding in streaming mode
+        # The conv layer will handle its own padding internally
+        output = self.conv(input_with_context)
+
+        if debug:
+            print(f"[DEBUG] Output shape: {output.shape}")
+        
+        # Update cache for next chunk
+        if self.context_size > 0:
+            # Calculate how many samples to keep
+            total_input_length = input_with_context.shape[2]
+            
+            # Keep the last context_size samples
+            if total_input_length >= self.context_size:
+                new_cache_start = total_input_length - self.context_size
+                new_cache = input_with_context[:, :, new_cache_start:]
+            else:
+                # If we have less than context_size samples, keep everything
+                new_cache = input_with_context
+                
+            if debug:
+                print(f"[DEBUG] New cache shape: {new_cache.shape}")
+                
+            cache.set(self.layer_id, sample_indices, new_cache)
+        
+        return output
+    
+    def _forward_non_streaming(self, x: torch.Tensor, debug: bool = False) -> torch.Tensor:
+        """Standard forward pass without streaming"""
+        B, C, T = x.shape
+        kernel_size = self.kernel_size
+        stride = self.stride
+        dilation = self.dilation
+        padding_total = self.padding_total
+        
+        # Compute extra padding for stride alignment
+        extra_padding = get_extra_padding_for_conv1d(x, kernel_size, stride, padding_total)
+        
+        if debug:
+            print(f"[DEBUG NON-STREAMING] Input shape: {x.shape}, padding_total={padding_total}, extra_padding={extra_padding}")
+        
+        if self.causal:
+            # Left padding for causal
+            if self.pad_mode == 'constant':
+                x = pad1d(x, (padding_total, extra_padding), mode=self.pad_mode, value=0)
+            else:
+                x = pad1d(x, (padding_total, extra_padding), mode=self.pad_mode)
+        else:
+            # Symmetric padding for non-causal
+            padding_right = padding_total // 2
+            padding_left = padding_total - padding_right
+            x = pad1d(x, (padding_left, padding_right + extra_padding), mode=self.pad_mode)
+        
+        if debug:
+            print(f"[DEBUG NON-STREAMING] After padding: {x.shape}")
+            
+        output = self.conv(x)
+        
+        if debug:
+            print(f"[DEBUG NON-STREAMING] Output shape: {output.shape}")
+        
+        return output
+
+
+class SConvTranspose1d(nn.Module):
+    """ConvTranspose1d with built-in handling of asymmetric or causal padding and normalization."""
+    def __init__(self, in_channels: int, out_channels: int,
+                kernel_size: int, stride: int = 1, causal: bool = False,
+                norm: str = 'none', trim_right_ratio: float = 1.,
+                norm_kwargs: tp.Dict[str, tp.Any] = {}, bias: bool = True):
+        super().__init__()
+        self.convtr = NormConvTranspose1d(in_channels, out_channels, kernel_size, stride,
+                                        causal=causal, norm=norm, norm_kwargs=norm_kwargs, bias=bias)
+        self.causal = causal
+        self.trim_right_ratio = trim_right_ratio
+        assert self.causal or self.trim_right_ratio == 1., \
+            "`trim_right_ratio` != 1.0 only makes sense for causal convolutions"
+        assert self.trim_right_ratio >= 0. and self.trim_right_ratio <= 1.
+
+        # Store configuration
+        self.kernel_size = kernel_size
+        self.stride = stride
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        
+        # For transposed convolution, padding calculation is different
+        self.padding_total = kernel_size - stride
+        
+        # For streaming, we need to keep track of input history
+        # Transposed conv needs to see multiple input samples to produce correct output
+        self.context_size = kernel_size - 1
+        
+        # Create a unique layer ID for cache management
+        self._layer_id = None
+
+    @property
+    def layer_id(self):
+        if self._layer_id is None:
+            self._layer_id = f"sconvtr1d_{id(self)}"
+        return self._layer_id
+    
+    def forward(self, x: torch.Tensor,
+                cache: Optional[VibeVoiceTokenizerStreamingCache] = None,
+                sample_indices: Optional[torch.Tensor] = None,
+                use_cache: bool = False,
+                debug: bool = False) -> torch.Tensor:
+        """
+        Forward pass with optional streaming support via cache.
+        """
+        B, C, T = x.shape
+        
+        # Non-streaming mode
+        if not use_cache or cache is None:
+            return self._forward_non_streaming(x, debug=debug)
+        
+        # Streaming mode
+        assert sample_indices is not None, "sample_indices must be provided for streaming mode"
+        assert len(sample_indices) == B, "sample_indices must match batch size"
+        
+        return self._forward_streaming(x, cache, sample_indices, debug)
+    
+    def _forward_streaming(self, x: torch.Tensor,
+                          cache: VibeVoiceTokenizerStreamingCache,
+                          sample_indices: torch.Tensor,
+                          debug: bool = False) -> torch.Tensor:
+        """Streaming forward pass with cache operations kept separate from compiled code"""
+        B, C, T = x.shape
+        
+        # Cache operations (not compiled)
+        cached_input = cache.get(self.layer_id, sample_indices)
+        
+        if cached_input is None:
+            # First chunk - no history yet
+            cached_input = torch.zeros(B, C, 0, device=x.device, dtype=x.dtype)
+            if debug:
+                print(f"[DEBUG] Initialized empty cache for transposed conv")
+        
+        # Concatenate cached input with new input
+        full_input = torch.cat([cached_input, x], dim=2)
+        
+        if debug:
+            print(f"[DEBUG] Input shape: {x.shape}, Cache shape: {cached_input.shape}, Combined: {full_input.shape}")
+        
+        # First chunk or debug mode - use uncompiled version
+        full_output = self.convtr(full_input)
+        
+        if debug:
+            print(f"[DEBUG] Full transposed conv output shape: {full_output.shape}")
+        
+        # Calculate padding to remove
+        if self.causal:
+            padding_right = math.ceil(self.padding_total * self.trim_right_ratio)
+            padding_left = self.padding_total - padding_right
+        else:
+            padding_right = self.padding_total // 2
+            padding_left = self.padding_total - padding_right
+        
+        # Remove padding
+        if padding_left + padding_right > 0:
+            full_output = unpad1d(full_output, (padding_left, padding_right))
+        
+        if debug:
+            print(f"[DEBUG] After unpadding: {full_output.shape}")
+        
+        # Determine which part of the output corresponds to the new input
+        if cached_input.shape[2] == 0:
+            # First chunk - return all output
+            output = full_output
+        else:
+            # Subsequent chunks - return only the new output
+            expected_new_output = T * self.stride
+            
+            # Take the last expected_new_output samples
+            if full_output.shape[2] >= expected_new_output:
+                output = full_output[:, :, -expected_new_output:]
+            else:
+                output = full_output
+        
+        if debug:
+            print(f"[DEBUG] Final streaming output shape: {output.shape}")
+        
+        # Update cache
+        if full_input.shape[2] > self.context_size:
+            new_cache = full_input[:, :, -self.context_size:]
+        else:
+            new_cache = full_input
+        
+        if debug:
+            print(f"[DEBUG] New cache shape: {new_cache.shape}")
+            
+        cache.set(self.layer_id, sample_indices, new_cache)
+        
+        return output
+    
+    def _forward_non_streaming(self, x: torch.Tensor, debug: bool = False) -> torch.Tensor:
+        """Standard forward pass without streaming"""
+        if debug:
+            print(f"[DEBUG NON-STREAMING] Input shape: {x.shape}")
+        
+        # Apply transposed convolution
+        y = self.convtr(x)
+        
+        if debug:
+            print(f"[DEBUG NON-STREAMING] After transposed conv: {y.shape}")
+        
+        # Calculate and remove padding
+        if self.causal:
+            padding_right = math.ceil(self.padding_total * self.trim_right_ratio)
+            padding_left = self.padding_total - padding_right
+        else:
+            padding_right = self.padding_total // 2
+            padding_left = self.padding_total - padding_right
+        
+        if padding_left + padding_right > 0:
+            y = unpad1d(y, (padding_left, padding_right))
+        
+        if debug:
+            print(f"[DEBUG NON-STREAMING] Final output shape: {y.shape}")
+            
+        return y
+    
+# FFN 
+class FFN(nn.Module):
+    def __init__(
+        self,
+        embed_dim,
+        ffn_dim,
+        bias=False,
+    ):
+        super().__init__()
+        self.embed_dim = embed_dim
+        self.linear1 = nn.Linear(self.embed_dim, ffn_dim, bias=bias) 
+        self.gelu = ACT2FN["gelu"]
+        self.linear2 = nn.Linear(ffn_dim, self.embed_dim, bias=bias)
+
+    def forward(self, x):
+        x = self.linear1(x)
+        x = self.gelu(x)
+        x = self.linear2(x)
+        return x
+
+
+class Convlayer(nn.Module):
+    def __init__(
+            self, 
+            in_channels, 
+            out_channels, 
+            kernel_size, 
+            stride=1, 
+            dilation=1, 
+            groups=1, 
+            bias=True, 
+            pad_mode='zeros', 
+            norm='weight_norm', 
+            causal=True, 
+        ):
+        super().__init__()
+        self.conv = SConv1d(in_channels, out_channels, kernel_size, stride=stride, dilation=dilation, 
+                           groups=groups, bias=bias, pad_mode=pad_mode, norm=norm, causal=causal)
+
+    def forward(self, x):
+        return self.conv(x)
+
+class Block1D(nn.Module):
+    def __init__(self, dim, kernel_size=7, drop_path=0., mixer_layer='conv',  
+                layer_scale_init_value=1e-6, **kwargs):
+        super().__init__()
+        
+        if kwargs.get('layernorm', 'LN') == 'LN':
+            self.norm = ConvLayerNorm(dim, eps=kwargs.get('eps', 1e-6))
+            self.ffn_norm = ConvLayerNorm(dim, eps=kwargs.get('eps', 1e-6))               
+        elif kwargs.get('layernorm', 'RMSNorm') == 'RMSNorm':
+            self.norm = ConvRMSNorm(dim, eps=kwargs.get('eps', 1e-6))
+            self.ffn_norm = ConvRMSNorm(dim, eps=kwargs.get('eps', 1e-6))
+
+        if mixer_layer == 'conv':
+            self.mixer = Convlayer(dim, dim, groups=kwargs.get('groups', 1),
+                                kernel_size=kernel_size, 
+                                pad_mode=kwargs.get('pad_mode', 'reflect'), 
+                                norm=kwargs.get('norm', 'none'), 
+                                causal=kwargs.get('causal', True), 
+                                bias=kwargs.get('bias', True),
+                                )
+        elif mixer_layer == 'depthwise_conv':
+            self.mixer = Convlayer(dim, dim, groups=dim,
+                                kernel_size=kernel_size, 
+                                pad_mode=kwargs.get('pad_mode', 'reflect'), 
+                                norm=kwargs.get('norm', 'none'), 
+                                causal=kwargs.get('causal', True), 
+                                bias=kwargs.get('bias', True),
+                                )
+        else:
+            raise ValueError(f"Unsupported mixer layer: {mixer_layer}")
+        
+        self.ffn = FFN(
+            dim, 
+            kwargs.get('ffn_expansion', 4) * dim, 
+            bias=kwargs.get('bias', False),
+        )
+        self.drop_path = nn.Identity() if drop_path <= 0. else nn.modules.DropPath(drop_path)
+
+        if layer_scale_init_value > 0:
+            self.gamma = nn.Parameter(layer_scale_init_value * torch.ones((dim)), requires_grad=True)
+            self.ffn_gamma = nn.Parameter(layer_scale_init_value * torch.ones((dim)), requires_grad=True)
+        else:
+            self.gamma = None
+            self.ffn_gamma = None
+
+    def forward(self, x):
+        # mixer
+        residual = x
+        x = self.norm(x)
+        x = self.mixer(x)
+        if self.gamma is not None:
+            x = x * self.gamma.unsqueeze(-1)
+        x = residual + self.drop_path(x)
+
+        # ffn
+        residual = x
+        x = self.ffn_norm(x)
+        x = x.permute(0, 2, 1)
+        x = self.ffn(x)
+        x = x.permute(0, 2, 1)
+        if self.ffn_gamma is not None:
+            x = x * self.ffn_gamma.unsqueeze(-1)
+        x = residual + self.drop_path(x)
+
+        return x
+
+
+class TokenizerEncoder(nn.Module):
+    """
+    Encoder component for the VibeVoice tokenizer that converts audio to latent representations.
+    
+    Args:
+        config: Configuration object with model parameters
+    """
+    def __init__(self, config):
+        super().__init__()
+        
+        # Extract parameters from config
+        self.channels = config.channels
+        self.dimension = config.dimension
+        self.n_filters = config.n_filters
+        self.ratios = list(reversed(config.ratios))
+        self.depths = config.depths
+        self.n_residual_layers = getattr(config, "n_residual_layers", 1)
+        self.hop_length = np.prod(self.ratios)
+        self.causal = config.causal
+        
+        # Additional config parameters with defaults
+        kernel_size = getattr(config, "kernel_size", 7)
+        last_kernel_size = getattr(config, "last_kernel_size", 7)
+        norm = getattr(config, "norm", "none")
+        norm_params = getattr(config, "norm_params", {})
+        pad_mode = getattr(config, "pad_mode", "reflect")
+        bias = getattr(config, "bias", True)
+        layernorm = getattr(config, "layernorm", "LN")
+        layernorm_eps = getattr(config, "layernorm_eps", 1e-6)
+        layernorm_elementwise_affine = getattr(config, "layernorm_elementwise_affine", True)
+        drop_path_rate = getattr(config, "drop_path_rate", 0.0)
+        mixer_layer = getattr(config, "mixer_layer", "conv")
+        layer_scale_init_value = getattr(config, "layer_scale_init_value", 0)
+        disable_last_norm = getattr(config, "disable_last_norm", False)
+        
+        # determine the norm type based on layernorm
+        if layernorm == 'LN':
+            norm_type = ConvLayerNorm
+        elif layernorm == 'RMSNorm':
+            norm_type = partial(ConvRMSNorm, elementwise_affine=layernorm_elementwise_affine)
+        else:
+            raise ValueError(f"Unsupported norm type: {layernorm}")
+        
+        # stem and intermediate downsampling conv layers
+        stem = nn.Sequential(
+                SConv1d(self.channels, self.n_filters, kernel_size, norm=norm, norm_kwargs=norm_params, causal=self.causal, pad_mode=pad_mode, bias=bias),
+            )
+        
+        self.downsample_layers = nn.ModuleList()
+        self.downsample_layers.append(stem)
+        for i in range(len(self.ratios)):
+            in_ch = self.n_filters * (2 ** i)
+            out_ch = self.n_filters * (2 ** (i + 1))
+            downsample_layer = nn.Sequential(
+                SConv1d(in_ch, out_ch, kernel_size=self.ratios[i] * 2, stride=self.ratios[i], causal=self.causal, pad_mode=pad_mode, norm=norm, bias=bias)
+            )
+            self.downsample_layers.append(downsample_layer)
+
+        # configure the transformer blocks
+        layer_type = partial(
+            Block1D,
+            mixer_layer=mixer_layer,
+            layernorm=layernorm,
+            eps=layernorm_eps,
+            causal=self.causal,
+            pad_mode=pad_mode,
+            norm=norm,
+            bias=bias,
+            layer_scale_init_value=layer_scale_init_value,
+        )
+        
+        self.stages = nn.ModuleList()
+        dp_rates = [x.item() for x in torch.linspace(0, drop_path_rate, sum(self.depths))] 
+        cur = 0
+
+        for i in range(len(self.depths)):
+            in_ch = self.n_filters * (2 ** i)
+            stage = nn.Sequential(
+                *[layer_type(dim=in_ch, drop_path=dp_rates[cur + j]) for j in range(self.depths[i])]
+            )
+            self.stages.append(stage)
+            cur += self.depths[i]
+        
+        if not disable_last_norm:
+            self.norm = norm_type(in_ch, eps=layernorm_eps)
+        else:
+            self.norm = nn.Identity()
+        self.head = SConv1d(in_ch, self.dimension, kernel_size=last_kernel_size, causal=self.causal, pad_mode=pad_mode, norm=norm, bias=bias)
+
+    def forward_features(self, x, cache=None, sample_indices=None, use_cache=False, debug=False):
+        for i in range(len(self.depths)):
+            # Apply downsampling
+            for layer in self.downsample_layers[i]:
+                if isinstance(layer, SConv1d):
+                    x = layer(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+                else:
+                    x = layer(x)
+            
+            # Apply stage (Block1D contains Convlayer which contains SConv1d)
+            for block in self.stages[i]:
+                if hasattr(block, 'mixer') and hasattr(block.mixer, 'conv') and isinstance(block.mixer.conv, SConv1d):
+                    # Block1D forward with cache support
+                    residual = x
+                    x = block.norm(x)
+                    x = block.mixer.conv(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+                    if block.gamma is not None:
+                        x = x * block.gamma.unsqueeze(-1)
+                    x = residual + x
+                    
+                    # FFN part
+                    residual = x
+                    x = block.ffn_norm(x)
+                    x = x.permute(0, 2, 1)
+                    x = block.ffn(x)
+                    x = x.permute(0, 2, 1)
+                    if block.ffn_gamma is not None:
+                        x = x * block.ffn_gamma.unsqueeze(-1)
+                    x = residual + x
+                else:
+                    x = block(x)
+
+        return self.norm(x)
+
+    def forward(self, x, cache=None, sample_indices=None, use_cache=False, debug=False):
+        x = self.forward_features(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        x = self.head(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return x
+
+
+class TokenizerDecoder(nn.Module):
+    """
+    Decoder component for the VibeVoice tokenizer that converts latent representations back to audio.
+    
+    Args:
+        config: Configuration object with model parameters
+    """
+    def __init__(self, config):
+        super().__init__()
+        
+        # Extract parameters from config
+        self.dimension = config.dimension
+        self.channels = config.channels
+        self.n_filters = config.n_filters
+        self.ratios = config.ratios
+        
+        # IMPORTANT CHANGE: Don't reverse depths again since they're already reversed in VibeVoiceAcousticTokenizerModel
+        self.depths = config.depths  # Changed from list(reversed(config.depths))
+        
+        self.n_residual_layers = getattr(config, "n_residual_layers", 1)
+        self.hop_length = np.prod(self.ratios)
+        self.causal = config.causal
+        
+        # Additional config parameters with defaults
+        kernel_size = getattr(config, "kernel_size", 7)
+        last_kernel_size = getattr(config, "last_kernel_size", 7)
+        norm = getattr(config, "norm", "none")
+        norm_params = getattr(config, "norm_params", {})
+        pad_mode = getattr(config, "pad_mode", "reflect")
+        bias = getattr(config, "bias", True)
+        layernorm = getattr(config, "layernorm", "LN")
+        layernorm_eps = getattr(config, "layernorm_eps", 1e-6)
+        trim_right_ratio = getattr(config, "trim_right_ratio", 1.0)
+        layernorm_elementwise_affine = getattr(config, "layernorm_elementwise_affine", True)
+        drop_path_rate = getattr(config, "drop_path_rate", 0.0)
+        mixer_layer = getattr(config, "mixer_layer", "conv")
+        layer_scale_init_value = getattr(config, "layer_scale_init_value", 0)
+        disable_last_norm = getattr(config, "disable_last_norm", False)
+
+        # determine the norm type based on layernorm
+        if layernorm == 'LN':
+            norm_type = ConvLayerNorm
+        elif layernorm == 'RMSNorm':
+            norm_type = partial(ConvRMSNorm, elementwise_affine=layernorm_elementwise_affine)
+        else:
+            raise ValueError(f"Unsupported norm type: {layernorm}")
+        
+        # stem and upsampling layers
+        stem = nn.Sequential(
+                SConv1d(self.dimension, self.n_filters * 2 ** (len(self.depths) - 1), kernel_size, norm=norm, 
+                        norm_kwargs=norm_params, causal=self.causal, pad_mode=pad_mode, bias=bias),
+            )
+        
+        self.upsample_layers = nn.ModuleList()
+        self.upsample_layers.append(stem)
+        for i in range(len(self.ratios)):
+            in_ch = self.n_filters * (2 ** (len(self.depths) - 1 - i))
+            out_ch = self.n_filters * (2 ** (len(self.depths) - 1 - i - 1))
+            upsample_layer = nn.Sequential(
+                SConvTranspose1d(in_ch, out_ch,
+                                kernel_size=self.ratios[i] * 2, stride=self.ratios[i],
+                                norm=norm, norm_kwargs=norm_params, bias=bias,
+                                causal=self.causal, trim_right_ratio=trim_right_ratio),
+            )
+            self.upsample_layers.append(upsample_layer)
+
+        # configure transformer blocks
+        layer_type = partial(
+            Block1D,
+            mixer_layer=mixer_layer,
+            layernorm=layernorm,
+            eps=layernorm_eps,
+            causal=self.causal,
+            pad_mode=pad_mode,
+            norm=norm,
+            bias=bias,
+            layer_scale_init_value=layer_scale_init_value,
+        )
+
+        self.stages = nn.ModuleList()
+        dp_rates = [x.item() for x in torch.linspace(0, drop_path_rate, sum(self.depths))] 
+        cur = 0
+        
+        # Create stages in the same order as the original model
+        for i in range(len(self.depths)):
+            in_ch = self.n_filters * (2 ** (len(self.depths) - 1 - i))
+            stage = nn.Sequential(
+                *[layer_type(dim=in_ch, drop_path=dp_rates[cur + j]) for j in range(self.depths[i])]
+            )
+            self.stages.append(stage)
+            cur += self.depths[i]
+
+        if not disable_last_norm:
+            self.norm = norm_type(in_ch, eps=layernorm_eps)
+        else:
+            self.norm = nn.Identity()
+        self.head = SConv1d(in_ch, self.channels, kernel_size=last_kernel_size, causal=self.causal, pad_mode=pad_mode, norm=norm, bias=bias)
+
+    def forward_features(self, x, cache=None, sample_indices=None, use_cache=False, debug=False):
+        for i in range(len(self.depths)):
+            # Apply upsampling
+            for layer in self.upsample_layers[i]:
+                if isinstance(layer, (SConv1d, SConvTranspose1d)):
+                    x = layer(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+                else:
+                    x = layer(x)
+            
+            # Apply stage (Block1D contains Convlayer which contains SConv1d)
+            for block in self.stages[i]:
+                if hasattr(block, 'mixer') and hasattr(block.mixer, 'conv') and isinstance(block.mixer.conv, SConv1d):
+                    # Block1D forward with cache support
+                    residual = x
+                    x = block.norm(x)
+                    x = block.mixer.conv(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+                    if block.gamma is not None:
+                        x = x * block.gamma.unsqueeze(-1)
+                    x = residual + x
+                    
+                    # FFN part
+                    residual = x
+                    x = block.ffn_norm(x)
+                    x = x.permute(0, 2, 1)
+                    x = block.ffn(x)
+                    x = x.permute(0, 2, 1)
+                    if block.ffn_gamma is not None:
+                        x = x * block.ffn_gamma.unsqueeze(-1)
+                    x = residual + x
+                else:
+                    x = block(x)
+
+        return self.norm(x)
+    
+    def forward(self, x, cache=None, sample_indices=None, use_cache=False, debug=False):
+        x = self.forward_features(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        x = self.head(x, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return x
+    
+
+@dataclass
+class VibeVoiceTokenizerEncoderOutput:
+    """
+    Output of VibeVoice tokenizer encoder, representing a Gaussian distribution with fixed variance.
+    
+    Args:
+        mean (`torch.FloatTensor`): The mean parameters of the distribution.
+        std (`float` or `torch.FloatTensor`): Fixed standard deviation value.
+    """
+    mean: torch.Tensor
+    std: Optional[Union[float, torch.Tensor]] = None
+    
+    def sample(self, dist_type='fix'):
+        """
+        Sample from the distribution.
+        
+        Args:
+            dist_type (`str`): Sampling method, either 'fix' or 'gaussian'.
+                
+        Returns:
+            `torch.FloatTensor`: Sampled values.
+            `torch.FloatTensor` (optional): Standard deviation used (only when dist_type='gaussian').
+        """
+        if dist_type == 'fix':
+            x = self.mean + self.std * torch.randn_like(self.mean)
+            return x, self.std
+        elif dist_type == 'gaussian':
+            batch_size = self.mean.size(0)
+            value = self.std / 0.8
+            std = torch.randn(batch_size, device=self.mean.device, dtype=self.mean.dtype) * value
+
+            while std.dim() < self.mean.dim():
+                std = std.unsqueeze(-1)
+
+            x = self.mean + std * torch.randn_like(self.mean)
+            return x, std
+        else:
+            return self.mean, self.std
+
+    def kl(self):
+        """Compute KL divergence between this distribution and a standard normal."""
+        target = torch.zeros_like(self.mean)
+        return F.mse_loss(self.mean, target, reduction='none')
+
+    def mode(self):
+        """Return the distribution mode (which is the mean for Gaussian)."""
+        return self.mean
+    
+class VibeVoiceAcousticTokenizerModel(PreTrainedModel):
+    """VibeVoice speech tokenizer model combining encoder and decoder for acoustic tokens"""
+    
+    config_class = VibeVoiceAcousticTokenizerConfig
+    base_model_prefix = "vibevoice_acoustic_tokenizer"
+    _supports_flash_attn_2 = True  
+    _supports_sdpa = True  
+    _no_split_modules = ["TokenizerEncoder", "TokenizerDecoder"]
+
+    def __init__(self, config):
+        super().__init__(config)
+        
+        self.register_buffer('fix_std', torch.tensor(config.fix_std), persistent=False)
+        self.std_dist_type = getattr(config, "std_dist_type", "fix")
+        
+        # Parse encoder depths
+        if isinstance(config.encoder_depths, str):
+            encoder_depths = [int(d) for d in config.encoder_depths.split('-')]
+        else:
+            encoder_depths = config.encoder_depths
+            
+        # Parse decoder depths if provided
+        if config.decoder_depths is not None and isinstance(config.decoder_depths, str):
+            decoder_depths = [int(d) for d in config.decoder_depths.split('-')]
+        else:
+            # Default: use reversed encoder depths if decoder_depths is None
+            decoder_depths = list(reversed(encoder_depths))
+        
+        # Create encoder config
+        encoder_config = copy.deepcopy(config)
+        encoder_config.dimension = config.vae_dim
+        encoder_config.n_filters = config.encoder_n_filters
+        encoder_config.ratios = config.encoder_ratios
+        encoder_config.depths = encoder_depths
+        encoder_config.norm = config.conv_norm
+        encoder_config.pad_mode = config.pad_mode
+        encoder_config.bias = config.conv_bias
+        encoder_config.layernorm_eps = config.layernorm_eps
+        encoder_config.layernorm_elementwise_affine = config.layernorm_elementwise_affine
+        encoder_config.mixer_layer = config.mixer_layer
+        encoder_config.layer_scale_init_value = config.layer_scale_init_value
+        encoder_config.disable_last_norm = config.disable_last_norm
+        
+        # Create decoder config
+        decoder_config = copy.deepcopy(config)
+        decoder_config.dimension = config.vae_dim
+        decoder_config.n_filters = config.decoder_n_filters
+        decoder_config.ratios = config.decoder_ratios
+        decoder_config.depths = decoder_depths
+        decoder_config.norm = config.conv_norm
+        decoder_config.pad_mode = config.pad_mode
+        decoder_config.bias = config.conv_bias
+        decoder_config.layernorm_eps = config.layernorm_eps
+        decoder_config.layernorm_elementwise_affine = config.layernorm_elementwise_affine
+        decoder_config.mixer_layer = config.mixer_layer
+        decoder_config.layer_scale_init_value = config.layer_scale_init_value
+        decoder_config.disable_last_norm = config.disable_last_norm
+        
+        # Initialize encoder and decoder
+        self.encoder = TokenizerEncoder(encoder_config)
+        self.decoder = TokenizerDecoder(decoder_config)
+        
+        # Initialize weights
+        self.apply(self._init_weights)
+    
+    def _init_weights(self, module):
+        """Initialize weights for the model"""
+        if isinstance(module, nn.Linear):
+            nn.init.normal_(module.weight, std=self.config.weight_init_value)
+            if module.bias is not None:
+                nn.init.zeros_(module.bias)
+        elif isinstance(module, nn.LayerNorm):
+            nn.init.ones_(module.weight)
+            nn.init.zeros_(module.bias)
+        elif isinstance(module, nn.Conv1d):
+            nn.init.normal_(module.weight, std=self.config.weight_init_value)
+            if module.bias is not None:
+                nn.init.zeros_(module.bias)
+    
+    @torch.no_grad()
+    def encode(self, audio, cache=None, sample_indices=None, use_cache=False, debug=False):
+        """Convert audio to latent representations"""
+        latents = self.encoder(audio, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return VibeVoiceTokenizerEncoderOutput(mean=latents.permute(0, 2, 1), std=self.fix_std)
+    
+    @torch.no_grad()
+    def sampling(self, encoder_output, dist_type=None):
+        """Sample from the encoder output distribution"""
+        dist_type = dist_type or self.std_dist_type
+    
+        if dist_type == 'fix':
+            return encoder_output.sample(dist_type='fix')
+        elif dist_type == 'gaussian':
+            return encoder_output.sample(dist_type='gaussian')
+        else:
+            raise ValueError(f"Unsupported dist_type: {dist_type}, expected 'fix' or 'gaussian'")
+    
+    @torch.no_grad()
+    def decode(self, latents, cache=None, sample_indices=None, use_cache=False, debug=False):
+        """Convert latent representations back to audio"""
+        if latents.shape[1] == self.config.vae_dim:
+            pass
+        else:
+            latents = latents.permute(0, 2, 1)
+
+        audio = self.decoder(latents, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return audio
+
+    def forward(self, audio, cache=None, sample_indices=None, use_cache=False, debug=False):
+        """Full forward pass: encode audio to latents, then decode back to audio"""
+        encoder_output = self.encode(audio, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        sampled_latents, _ = self.sampling(encoder_output)
+        reconstructed = self.decode(sampled_latents, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return reconstructed, sampled_latents
+
+
+class VibeVoiceSemanticTokenizerModel(PreTrainedModel):
+    """VibeVoice speech tokenizer model with only encoder for semantic tokens"""
+    
+    config_class = VibeVoiceSemanticTokenizerConfig
+    base_model_prefix = "vibevoice_semantic_tokenizer"
+    _supports_flash_attn_2 = True  
+    _supports_sdpa = True  
+    _no_split_modules = ["TokenizerEncoder"]
+    
+    def __init__(self, config):
+        super().__init__(config)
+        
+        # Parse encoder depths
+        if isinstance(config.encoder_depths, str):
+            encoder_depths = [int(d) for d in config.encoder_depths.split('-')]
+        else:
+            encoder_depths = config.encoder_depths
+        
+        # Create encoder config
+        encoder_config = copy.deepcopy(config)
+        encoder_config.dimension = config.vae_dim
+        encoder_config.n_filters = config.encoder_n_filters
+        encoder_config.ratios = config.encoder_ratios
+        encoder_config.depths = encoder_depths
+        encoder_config.norm = config.conv_norm
+        encoder_config.pad_mode = config.pad_mode
+        encoder_config.bias = config.conv_bias
+        encoder_config.layernorm_eps = config.layernorm_eps
+        encoder_config.layernorm_elementwise_affine = config.layernorm_elementwise_affine
+        encoder_config.mixer_layer = config.mixer_layer
+        encoder_config.layer_scale_init_value = config.layer_scale_init_value
+        encoder_config.disable_last_norm = config.disable_last_norm
+        
+        # Initialize encoder and decoder
+        self.encoder = TokenizerEncoder(encoder_config)
+        
+        # Initialize weights
+        self.apply(self._init_weights)
+    
+    def _init_weights(self, module):
+        """Initialize weights for the model"""
+        if isinstance(module, nn.Linear):
+            nn.init.normal_(module.weight, std=self.config.weight_init_value)
+            if module.bias is not None:
+                nn.init.zeros_(module.bias)
+        elif isinstance(module, nn.LayerNorm):
+            nn.init.ones_(module.weight)
+            nn.init.zeros_(module.bias)
+        elif isinstance(module, nn.Conv1d):
+            nn.init.normal_(module.weight, std=self.config.weight_init_value)
+            if module.bias is not None:
+                nn.init.zeros_(module.bias)
+    
+    @torch.no_grad()
+    def encode(self, audio, cache=None, sample_indices=None, use_cache=False, debug=False):
+        """Convert audio to latent representations"""
+        latents = self.encoder(audio, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        return VibeVoiceTokenizerEncoderOutput(mean=latents.permute(0, 2, 1))
+    
+    @torch.no_grad()
+    def sampling(self, encoder_output, dist_type=None):
+        """Sample from the encoder output distribution"""
+        return encoder_output.sample(dist_type='none')
+
+    def forward(self, audio, cache=None, sample_indices=None, use_cache=False, debug=False):
+        """Full forward pass: encode audio to latents, then decode back to audio"""
+        encoder_output = self.encode(audio, cache=cache, sample_indices=sample_indices, use_cache=use_cache, debug=debug)
+        sampled_latents, _ = self.sampling(encoder_output, dist_type='none')
+        return None, sampled_latents
+
+AutoModel.register(VibeVoiceAcousticTokenizerConfig, VibeVoiceAcousticTokenizerModel)
+AutoModel.register(VibeVoiceSemanticTokenizerConfig, VibeVoiceSemanticTokenizerModel)
+
+__all__ = [
+    "VibeVoiceTokenizerStreamingCache",
+    "VibeVoiceAcousticTokenizerModel",
+    "VibeVoiceSemanticTokenizerModel",
+]

src/vibevoice/modular/streamer.py

@@ -0,0 +1,264 @@
+from __future__ import annotations
+
+import torch
+
+import asyncio
+from queue import Queue
+from typing import TYPE_CHECKING, Optional
+
+
+from transformers.generation import BaseStreamer
+
+
+class AudioStreamer(BaseStreamer):
+    """
+    Audio streamer that stores audio chunks in queues for each sample in the batch.
+    This allows streaming audio generation for multiple samples simultaneously.
+    
+    Parameters:
+        batch_size (`int`):
+            The batch size for generation
+        stop_signal (`any`, *optional*):
+            The signal to put in the queue when generation ends. Defaults to None.
+        timeout (`float`, *optional*):
+            The timeout for the audio queue. If `None`, the queue will block indefinitely.
+    """
+    
+    def __init__(
+        self, 
+        batch_size: int,
+        stop_signal: Optional[any] = None,
+        timeout: Optional[float] = None,
+    ):
+        self.batch_size = batch_size
+        self.stop_signal = stop_signal
+        self.timeout = timeout
+        
+        # Create a queue for each sample in the batch
+        self.audio_queues = [Queue() for _ in range(batch_size)]
+        self.finished_flags = [False for _ in range(batch_size)]
+        self.sample_indices_map = {}  # Maps from sample index to queue index
+        
+    def put(self, audio_chunks: torch.Tensor, sample_indices: torch.Tensor):
+        """
+        Receives audio chunks and puts them in the appropriate queues.
+        
+        Args:
+            audio_chunks: Tensor of shape (num_samples, ...) containing audio chunks
+            sample_indices: Tensor indicating which samples these chunks belong to
+        """
+        for i, sample_idx in enumerate(sample_indices):
+            idx = sample_idx.item()
+            if idx < self.batch_size and not self.finished_flags[idx]:
+                # Convert to numpy or keep as tensor based on preference
+                audio_chunk = audio_chunks[i].detach().cpu()
+                self.audio_queues[idx].put(audio_chunk, timeout=self.timeout)
+    
+    def end(self, sample_indices: Optional[torch.Tensor] = None):
+        """
+        Signals the end of generation for specified samples or all samples.
+        
+        Args:
+            sample_indices: Optional tensor of sample indices to end. If None, ends all.
+        """
+        if sample_indices is None:
+            # End all samples
+            for idx in range(self.batch_size):
+                if not self.finished_flags[idx]:
+                    self.audio_queues[idx].put(self.stop_signal, timeout=self.timeout)
+                    self.finished_flags[idx] = True
+        else:
+            # End specific samples
+            for sample_idx in sample_indices:
+                idx = sample_idx.item() if torch.is_tensor(sample_idx) else sample_idx
+                if idx < self.batch_size and not self.finished_flags[idx]:
+                    self.audio_queues[idx].put(self.stop_signal, timeout=self.timeout)
+                    self.finished_flags[idx] = True
+    
+    def __iter__(self):
+        """Returns an iterator over the batch of audio streams."""
+        return AudioBatchIterator(self)
+    
+    def get_stream(self, sample_idx: int):
+        """Get the audio stream for a specific sample."""
+        if sample_idx >= self.batch_size:
+            raise ValueError(f"Sample index {sample_idx} exceeds batch size {self.batch_size}")
+        return AudioSampleIterator(self, sample_idx)
+
+
+class AudioSampleIterator:
+    """Iterator for a single audio stream from the batch."""
+    
+    def __init__(self, streamer: AudioStreamer, sample_idx: int):
+        self.streamer = streamer
+        self.sample_idx = sample_idx
+        
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        value = self.streamer.audio_queues[self.sample_idx].get(timeout=self.streamer.timeout)
+        if value == self.streamer.stop_signal:
+            raise StopIteration()
+        return value
+
+
+class AudioBatchIterator:
+    """Iterator that yields audio chunks for all samples in the batch."""
+    
+    def __init__(self, streamer: AudioStreamer):
+        self.streamer = streamer
+        self.active_samples = set(range(streamer.batch_size))
+        
+    def __iter__(self):
+        return self
+    
+    def __next__(self):
+        if not self.active_samples:
+            raise StopIteration()
+            
+        batch_chunks = {}
+        samples_to_remove = set()
+        
+        # Try to get chunks from all active samples
+        for idx in self.active_samples:
+            try:
+                value = self.streamer.audio_queues[idx].get(block=False)
+                if value == self.streamer.stop_signal:
+                    samples_to_remove.add(idx)
+                else:
+                    batch_chunks[idx] = value
+            except:
+                # Queue is empty for this sample, skip it this iteration
+                pass
+        
+        # Remove finished samples
+        self.active_samples -= samples_to_remove
+        
+        if batch_chunks:
+            return batch_chunks
+        elif self.active_samples:
+            # If no chunks were ready but we still have active samples, 
+            # wait a bit and try again
+            import time
+            time.sleep(0.01)
+            return self.__next__()
+        else:
+            raise StopIteration()
+
+
+class AsyncAudioStreamer(AudioStreamer):
+    """
+    Async version of AudioStreamer for use in async contexts.
+    """
+    
+    def __init__(
+        self, 
+        batch_size: int,
+        stop_signal: Optional[any] = None,
+        timeout: Optional[float] = None,
+    ):
+        super().__init__(batch_size, stop_signal, timeout)
+        # Replace regular queues with async queues
+        self.audio_queues = [asyncio.Queue() for _ in range(batch_size)]
+        self.loop = asyncio.get_running_loop()
+        
+    def put(self, audio_chunks: torch.Tensor, sample_indices: torch.Tensor):
+        """Put audio chunks in the appropriate async queues."""
+        for i, sample_idx in enumerate(sample_indices):
+            idx = sample_idx.item()
+            if idx < self.batch_size and not self.finished_flags[idx]:
+                audio_chunk = audio_chunks[i].detach().cpu()
+                self.loop.call_soon_threadsafe(
+                    self.audio_queues[idx].put_nowait, audio_chunk
+                )
+    
+    def end(self, sample_indices: Optional[torch.Tensor] = None):
+        """Signal the end of generation for specified samples."""
+        if sample_indices is None:
+            indices_to_end = range(self.batch_size)
+        else:
+            indices_to_end = [s.item() if torch.is_tensor(s) else s for s in sample_indices]
+            
+        for idx in indices_to_end:
+            if idx < self.batch_size and not self.finished_flags[idx]:
+                self.loop.call_soon_threadsafe(
+                    self.audio_queues[idx].put_nowait, self.stop_signal
+                )
+                self.finished_flags[idx] = True
+    
+    async def get_stream(self, sample_idx: int):
+        """Get async iterator for a specific sample's audio stream."""
+        if sample_idx >= self.batch_size:
+            raise ValueError(f"Sample index {sample_idx} exceeds batch size {self.batch_size}")
+            
+        while True:
+            value = await self.audio_queues[sample_idx].get()
+            if value == self.stop_signal:
+                break
+            yield value
+    
+    def __aiter__(self):
+        """Returns an async iterator over all audio streams."""
+        return AsyncAudioBatchIterator(self)
+
+
+class AsyncAudioBatchIterator:
+    """Async iterator for batch audio streaming."""
+    
+    def __init__(self, streamer: AsyncAudioStreamer):
+        self.streamer = streamer
+        self.active_samples = set(range(streamer.batch_size))
+        
+    def __aiter__(self):
+        return self
+        
+    async def __anext__(self):
+        if not self.active_samples:
+            raise StopAsyncIteration()
+            
+        batch_chunks = {}
+        samples_to_remove = set()
+        
+        # Create tasks for all active samples
+        tasks = {
+            idx: asyncio.create_task(self._get_chunk(idx)) 
+            for idx in self.active_samples
+        }
+        
+        # Wait for at least one chunk to be ready
+        done, pending = await asyncio.wait(
+            tasks.values(), 
+            return_when=asyncio.FIRST_COMPLETED,
+            timeout=self.streamer.timeout
+        )
+        
+        # Cancel pending tasks
+        for task in pending:
+            task.cancel()
+            
+        # Process completed tasks
+        for idx, task in tasks.items():
+            if task in done:
+                try:
+                    value = await task
+                    if value == self.streamer.stop_signal:
+                        samples_to_remove.add(idx)
+                    else:
+                        batch_chunks[idx] = value
+                except asyncio.CancelledError:
+                    pass
+                    
+        self.active_samples -= samples_to_remove
+        
+        if batch_chunks:
+            return batch_chunks
+        elif self.active_samples:
+            # Try again if we still have active samples
+            return await self.__anext__()
+        else:
+            raise StopAsyncIteration()
+    
+    async def _get_chunk(self, idx):
+        """Helper to get a chunk from a specific queue."""
+        return await self.streamer.audio_queues[idx].get()