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"""
PyTorch Lightning DataModule for LoRA Training
Handles data loading and preprocessing for training ACE-Step LoRA adapters.
Supports both raw audio loading and preprocessed tensor loading.
"""
import os
import json
import random
from typing import Optional, List, Dict, Any, Tuple
from loguru import logger
import torch
import torchaudio
from torch.utils.data import Dataset, DataLoader
try:
from lightning.pytorch import LightningDataModule
LIGHTNING_AVAILABLE = True
except ImportError:
LIGHTNING_AVAILABLE = False
logger.warning("Lightning not installed. Training module will not be available.")
# Create a dummy class for type hints
class LightningDataModule:
pass
# ============================================================================
# Preprocessed Tensor Dataset (Recommended for Training)
# ============================================================================
class PreprocessedTensorDataset(Dataset):
"""Dataset that loads preprocessed tensor files.
This is the recommended dataset for training as all tensors are pre-computed:
- target_latents: VAE-encoded audio [T, 64]
- encoder_hidden_states: Condition encoder output [L, D]
- encoder_attention_mask: Condition mask [L]
- context_latents: Source context [T, 65]
- attention_mask: Audio latent mask [T]
No VAE/text encoder needed during training - just load tensors directly!
"""
def __init__(self, tensor_dir: str):
"""Initialize from a directory of preprocessed .pt files.
Args:
tensor_dir: Directory containing preprocessed .pt files and manifest.json
"""
self.tensor_dir = tensor_dir
self.sample_paths = []
# Load manifest if exists
manifest_path = os.path.join(tensor_dir, "manifest.json")
if os.path.exists(manifest_path):
with open(manifest_path, 'r') as f:
manifest = json.load(f)
self.sample_paths = manifest.get("samples", [])
else:
# Fallback: scan directory for .pt files
for f in os.listdir(tensor_dir):
if f.endswith('.pt') and f != "manifest.json":
self.sample_paths.append(os.path.join(tensor_dir, f))
# Validate paths
self.valid_paths = [p for p in self.sample_paths if os.path.exists(p)]
if len(self.valid_paths) != len(self.sample_paths):
logger.warning(f"Some tensor files not found: {len(self.sample_paths) - len(self.valid_paths)} missing")
logger.info(f"PreprocessedTensorDataset: {len(self.valid_paths)} samples from {tensor_dir}")
def __len__(self) -> int:
return len(self.valid_paths)
def __getitem__(self, idx: int) -> Dict[str, torch.Tensor]:
"""Load a preprocessed tensor file.
Returns:
Dictionary containing all pre-computed tensors for training
"""
tensor_path = self.valid_paths[idx]
data = torch.load(tensor_path, map_location='cpu')
return {
"target_latents": data["target_latents"], # [T, 64]
"attention_mask": data["attention_mask"], # [T]
"encoder_hidden_states": data["encoder_hidden_states"], # [L, D]
"encoder_attention_mask": data["encoder_attention_mask"], # [L]
"context_latents": data["context_latents"], # [T, 65]
"metadata": data.get("metadata", {}),
}
def collate_preprocessed_batch(batch: List[Dict]) -> Dict[str, torch.Tensor]:
"""Collate function for preprocessed tensor batches.
Handles variable-length tensors by padding to the longest in the batch.
Args:
batch: List of sample dictionaries with pre-computed tensors
Returns:
Batched dictionary with all tensors stacked
"""
# Get max lengths
max_latent_len = max(s["target_latents"].shape[0] for s in batch)
max_encoder_len = max(s["encoder_hidden_states"].shape[0] for s in batch)
# Pad and stack tensors
target_latents = []
attention_masks = []
encoder_hidden_states = []
encoder_attention_masks = []
context_latents = []
for sample in batch:
# Pad target_latents [T, 64] -> [max_T, 64]
tl = sample["target_latents"]
if tl.shape[0] < max_latent_len:
pad = torch.zeros(max_latent_len - tl.shape[0], tl.shape[1])
tl = torch.cat([tl, pad], dim=0)
target_latents.append(tl)
# Pad attention_mask [T] -> [max_T]
am = sample["attention_mask"]
if am.shape[0] < max_latent_len:
pad = torch.zeros(max_latent_len - am.shape[0])
am = torch.cat([am, pad], dim=0)
attention_masks.append(am)
# Pad context_latents [T, 65] -> [max_T, 65]
cl = sample["context_latents"]
if cl.shape[0] < max_latent_len:
pad = torch.zeros(max_latent_len - cl.shape[0], cl.shape[1])
cl = torch.cat([cl, pad], dim=0)
context_latents.append(cl)
# Pad encoder_hidden_states [L, D] -> [max_L, D]
ehs = sample["encoder_hidden_states"]
if ehs.shape[0] < max_encoder_len:
pad = torch.zeros(max_encoder_len - ehs.shape[0], ehs.shape[1])
ehs = torch.cat([ehs, pad], dim=0)
encoder_hidden_states.append(ehs)
# Pad encoder_attention_mask [L] -> [max_L]
eam = sample["encoder_attention_mask"]
if eam.shape[0] < max_encoder_len:
pad = torch.zeros(max_encoder_len - eam.shape[0])
eam = torch.cat([eam, pad], dim=0)
encoder_attention_masks.append(eam)
return {
"target_latents": torch.stack(target_latents), # [B, T, 64]
"attention_mask": torch.stack(attention_masks), # [B, T]
"encoder_hidden_states": torch.stack(encoder_hidden_states), # [B, L, D]
"encoder_attention_mask": torch.stack(encoder_attention_masks), # [B, L]
"context_latents": torch.stack(context_latents), # [B, T, 65]
"metadata": [s["metadata"] for s in batch],
}
class PreprocessedDataModule(LightningDataModule if LIGHTNING_AVAILABLE else object):
"""DataModule for preprocessed tensor files.
This is the recommended DataModule for training. It loads pre-computed tensors
directly without needing VAE, text encoder, or condition encoder at training time.
"""
def __init__(
self,
tensor_dir: str,
batch_size: int = 1,
num_workers: int = 4,
pin_memory: bool = True,
val_split: float = 0.0,
):
"""Initialize the data module.
Args:
tensor_dir: Directory containing preprocessed .pt files
batch_size: Training batch size
num_workers: Number of data loading workers
pin_memory: Whether to pin memory for faster GPU transfer
val_split: Fraction of data for validation (0 = no validation)
"""
if LIGHTNING_AVAILABLE:
super().__init__()
self.tensor_dir = tensor_dir
self.batch_size = batch_size
self.num_workers = num_workers
self.pin_memory = pin_memory
self.val_split = val_split
self.train_dataset = None
self.val_dataset = None
def setup(self, stage: Optional[str] = None):
"""Setup datasets."""
if stage == 'fit' or stage is None:
# Create full dataset
full_dataset = PreprocessedTensorDataset(self.tensor_dir)
# Split if validation requested
if self.val_split > 0 and len(full_dataset) > 1:
n_val = max(1, int(len(full_dataset) * self.val_split))
n_train = len(full_dataset) - n_val
self.train_dataset, self.val_dataset = torch.utils.data.random_split(
full_dataset, [n_train, n_val]
)
else:
self.train_dataset = full_dataset
self.val_dataset = None
def train_dataloader(self) -> DataLoader:
"""Create training dataloader."""
return DataLoader(
self.train_dataset,
batch_size=self.batch_size,
shuffle=True,
num_workers=self.num_workers,
pin_memory=self.pin_memory,
collate_fn=collate_preprocessed_batch,
drop_last=True,
)
def val_dataloader(self) -> Optional[DataLoader]:
"""Create validation dataloader."""
if self.val_dataset is None:
return None
return DataLoader(
self.val_dataset,
batch_size=self.batch_size,
shuffle=False,
num_workers=self.num_workers,
pin_memory=self.pin_memory,
collate_fn=collate_preprocessed_batch,
)
# ============================================================================
# Raw Audio Dataset (Legacy - for backward compatibility)
# ============================================================================
class AceStepTrainingDataset(Dataset):
"""Dataset for ACE-Step LoRA training from raw audio.
DEPRECATED: Use PreprocessedTensorDataset instead for better performance.
Audio Format Requirements (handled automatically):
- Sample rate: 48kHz (resampled if different)
- Channels: Stereo (2 channels, mono is duplicated)
- Max duration: 240 seconds (4 minutes)
- Min duration: 5 seconds (padded if shorter)
"""
def __init__(
self,
samples: List[Dict[str, Any]],
dit_handler,
max_duration: float = 240.0,
target_sample_rate: int = 48000,
):
"""Initialize the dataset."""
self.samples = samples
self.dit_handler = dit_handler
self.max_duration = max_duration
self.target_sample_rate = target_sample_rate
self.valid_samples = self._validate_samples()
logger.info(f"Dataset initialized with {len(self.valid_samples)} valid samples")
def _validate_samples(self) -> List[Dict[str, Any]]:
"""Validate and filter samples."""
valid = []
for i, sample in enumerate(self.samples):
audio_path = sample.get("audio_path", "")
if not audio_path or not os.path.exists(audio_path):
logger.warning(f"Sample {i}: Audio file not found: {audio_path}")
continue
if not sample.get("caption"):
logger.warning(f"Sample {i}: Missing caption")
continue
valid.append(sample)
return valid
def __len__(self) -> int:
return len(self.valid_samples)
def __getitem__(self, idx: int) -> Dict[str, torch.Tensor]:
"""Get a single training sample."""
sample = self.valid_samples[idx]
audio_path = sample["audio_path"]
audio, sr = torchaudio.load(audio_path)
# Resample to 48kHz
if sr != self.target_sample_rate:
resampler = torchaudio.transforms.Resample(sr, self.target_sample_rate)
audio = resampler(audio)
# Convert to stereo
if audio.shape[0] == 1:
audio = audio.repeat(2, 1)
elif audio.shape[0] > 2:
audio = audio[:2, :]
# Truncate/pad
max_samples = int(self.max_duration * self.target_sample_rate)
if audio.shape[1] > max_samples:
audio = audio[:, :max_samples]
min_samples = int(5.0 * self.target_sample_rate)
if audio.shape[1] < min_samples:
padding = min_samples - audio.shape[1]
audio = torch.nn.functional.pad(audio, (0, padding))
return {
"audio": audio,
"caption": sample.get("caption", ""),
"lyrics": sample.get("lyrics", "[Instrumental]"),
"metadata": {
"caption": sample.get("caption", ""),
"lyrics": sample.get("lyrics", "[Instrumental]"),
"bpm": sample.get("bpm"),
"keyscale": sample.get("keyscale", ""),
"timesignature": sample.get("timesignature", ""),
"duration": sample.get("duration", audio.shape[1] / self.target_sample_rate),
"language": sample.get("language", "instrumental"),
"is_instrumental": sample.get("is_instrumental", True),
},
"audio_path": audio_path,
}
def collate_training_batch(batch: List[Dict]) -> Dict[str, Any]:
"""Collate function for raw audio batches (legacy)."""
max_len = max(sample["audio"].shape[1] for sample in batch)
padded_audio = []
attention_masks = []
for sample in batch:
audio = sample["audio"]
audio_len = audio.shape[1]
if audio_len < max_len:
padding = max_len - audio_len
audio = torch.nn.functional.pad(audio, (0, padding))
padded_audio.append(audio)
mask = torch.ones(max_len)
if audio_len < max_len:
mask[audio_len:] = 0
attention_masks.append(mask)
return {
"audio": torch.stack(padded_audio),
"attention_mask": torch.stack(attention_masks),
"captions": [s["caption"] for s in batch],
"lyrics": [s["lyrics"] for s in batch],
"metadata": [s["metadata"] for s in batch],
"audio_paths": [s["audio_path"] for s in batch],
}
class AceStepDataModule(LightningDataModule if LIGHTNING_AVAILABLE else object):
"""DataModule for raw audio loading (legacy).
DEPRECATED: Use PreprocessedDataModule for better training performance.
"""
def __init__(
self,
samples: List[Dict[str, Any]],
dit_handler,
batch_size: int = 1,
num_workers: int = 4,
pin_memory: bool = True,
max_duration: float = 240.0,
val_split: float = 0.0,
):
if LIGHTNING_AVAILABLE:
super().__init__()
self.samples = samples
self.dit_handler = dit_handler
self.batch_size = batch_size
self.num_workers = num_workers
self.pin_memory = pin_memory
self.max_duration = max_duration
self.val_split = val_split
self.train_dataset = None
self.val_dataset = None
def setup(self, stage: Optional[str] = None):
if stage == 'fit' or stage is None:
if self.val_split > 0 and len(self.samples) > 1:
n_val = max(1, int(len(self.samples) * self.val_split))
indices = list(range(len(self.samples)))
random.shuffle(indices)
val_indices = indices[:n_val]
train_indices = indices[n_val:]
train_samples = [self.samples[i] for i in train_indices]
val_samples = [self.samples[i] for i in val_indices]
self.train_dataset = AceStepTrainingDataset(
train_samples, self.dit_handler, self.max_duration
)
self.val_dataset = AceStepTrainingDataset(
val_samples, self.dit_handler, self.max_duration
)
else:
self.train_dataset = AceStepTrainingDataset(
self.samples, self.dit_handler, self.max_duration
)
self.val_dataset = None
def train_dataloader(self) -> DataLoader:
return DataLoader(
self.train_dataset,
batch_size=self.batch_size,
shuffle=True,
num_workers=self.num_workers,
pin_memory=self.pin_memory,
collate_fn=collate_training_batch,
drop_last=True,
)
def val_dataloader(self) -> Optional[DataLoader]:
if self.val_dataset is None:
return None
return DataLoader(
self.val_dataset,
batch_size=self.batch_size,
shuffle=False,
num_workers=self.num_workers,
pin_memory=self.pin_memory,
collate_fn=collate_training_batch,
)
def load_dataset_from_json(json_path: str) -> Tuple[List[Dict[str, Any]], Dict[str, Any]]:
"""Load a dataset from JSON file."""
with open(json_path, 'r', encoding='utf-8') as f:
data = json.load(f)
metadata = data.get("metadata", {})
samples = data.get("samples", [])
return samples, metadata
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