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@@ -33,3 +33,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+tokenizer.json filter=lfs diff=lfs merge=lfs -text

config.json

@@ -0,0 +1,39 @@
+{
+  "architectures": [
+    "Gemma3ForCausalLM"
+  ],
+  "auto_map": {
+    "AutoConfig": "configuration_gemmagain.GemmagainConfig",
+    "AutoModelForCausalLM": "modeling_gemmagain.GemmagainForCausalLM"
+  },
+  "attention_bias": false,
+  "attention_dropout": 0.0,
+  "attn_logit_softcapping": null,
+  "cache_implementation": "hybrid",
+  "final_logit_softcapping": null,
+  "head_dim": 256,
+  "hidden_activation": "gelu_pytorch_tanh",
+  "hidden_size": 2560,
+  "initializer_range": 0.02,
+  "intermediate_size": 10240,
+  "max_position_embeddings": 131072,
+  "model_type": "gemma3",
+  "num_attention_heads": 8,
+  "num_hidden_layers": 34,
+  "num_key_value_heads": 4,
+  "query_pre_attn_scalar": 256,
+  "rms_norm_eps": 1e-06,
+  "rope_local_base_freq": 10000.0,
+  "rope_scaling": {
+    "factor": 8.0,
+    "rope_type": "linear"
+  },
+  "rope_theta": 1000000.0,
+  "sliding_window": 1024,
+  "sliding_window_pattern": 6,
+  "layer_sequence": [[0, 34, 1]],
+  "torch_dtype": "bfloat16",
+  "use_cache": true,
+  "vocab_size": 262208,
+  "transformers_version": "4.51.0"
+}

configuration_gemmagain.py

@@ -0,0 +1,186 @@
+# coding=utf-8
+# Copyright 2025 Google Inc. HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Gemmagain model configuration - Gemma3 with layer looping support"""
+
+from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.modeling_rope_utils import rope_config_validation
+from transformers.utils import logging
+
+
+logger = logging.get_logger(__name__)
+
+
+class GemmagainConfig(PretrainedConfig):
+    r"""
+    Configuration class for Gemmagain - a Gemma3 text model with layer looping support.
+
+    This extends Gemma3TextConfig to add the `layer_sequence` parameter which controls
+    how layers are executed, allowing layers to be repeated multiple times.
+
+    Args:
+        vocab_size (`int`, *optional*, defaults to 262208):
+            Vocabulary size of the model.
+        hidden_size (`int`, *optional*, defaults to 2560):
+            Dimension of the hidden representations.
+        intermediate_size (`int`, *optional*, defaults to 10240):
+            Dimension of the MLP representations.
+        num_hidden_layers (`int`, *optional*, defaults to 34):
+            Number of hidden layers in the Transformer decoder.
+        num_attention_heads (`int`, *optional*, defaults to 8):
+            Number of attention heads for each attention layer.
+        num_key_value_heads (`int`, *optional*, defaults to 4):
+            Number of key_value heads for GQA.
+        head_dim (`int`, *optional*, defaults to 256):
+            The attention head dimension.
+        hidden_activation (`str`, *optional*, defaults to `"gelu_pytorch_tanh"`):
+            The activation function.
+        max_position_embeddings (`int`, *optional*, defaults to 131072):
+            Maximum sequence length.
+        layer_sequence (`list`, *optional*):
+            Order to execute layers. Defaults to all layers once.
+            Flexible format - each item can be:
+            - An integer: single layer index (e.g., 5 means layer 5)
+            - A 2-element list [start, end]: range of layers (e.g., [4, 20] means layers 4-19)
+            - A 3-element list [start, end, repeats]: range repeated N times
+            Examples:
+            - [[0, 34, 1]]: all 34 layers once
+            - [[0, 10], [10, 28, 2], [28, 34]]: layers 0-9, then 10-27 twice, then 28-33
+        layer_types (`list`, *optional*):
+            Attention pattern for each layer ("sliding_attention" or "full_attention").
+        sliding_window (`int`, *optional*, defaults to 1024):
+            Size of the sliding window for sliding attention layers.
+        rope_theta (`float`, *optional*, defaults to 1000000.0):
+            Base period for RoPE embeddings (global attention).
+        rope_local_base_freq (`float`, *optional*, defaults to 10000.0):
+            Base period for RoPE embeddings (local/sliding attention).
+        query_pre_attn_scalar (`float`, *optional*, defaults to 256):
+            Scaling factor for attention scores.
+        rms_norm_eps (`float`, *optional*, defaults to 1e-6):
+            Epsilon for RMS normalization.
+        attention_bias (`bool`, *optional*, defaults to False):
+            Whether to use bias in attention projections.
+        attention_dropout (`float`, *optional*, defaults to 0.0):
+            Dropout ratio for attention.
+        final_logit_softcapping (`float`, *optional*):
+            Softcapping for final logits.
+        attn_logit_softcapping (`float`, *optional*):
+            Softcapping for attention logits.
+        rope_scaling (`dict`, *optional*):
+            RoPE scaling configuration.
+        use_bidirectional_attention (`bool`, *optional*, defaults to False):
+            If True, use bidirectional attention instead of causal.
+    """
+
+    model_type = "gemma3"
+    keys_to_ignore_at_inference = ["past_key_values"]
+    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",
+    }
+    base_model_pp_plan = {
+        "embed_tokens": (["input_ids"], ["inputs_embeds"]),
+        "layers": (["hidden_states", "attention_mask"], ["hidden_states"]),
+        "norm": (["hidden_states"], ["hidden_states"]),
+    }
+
+    def __init__(
+        self,
+        vocab_size=262_208,
+        hidden_size=2560,
+        intermediate_size=10240,
+        num_hidden_layers=34,
+        num_attention_heads=8,
+        num_key_value_heads=4,
+        head_dim=256,
+        hidden_activation="gelu_pytorch_tanh",
+        max_position_embeddings=131_072,
+        initializer_range=0.02,
+        rms_norm_eps=1e-6,
+        use_cache=True,
+        pad_token_id=0,
+        eos_token_id=1,
+        bos_token_id=2,
+        tie_word_embeddings=True,
+        rope_theta=1_000_000.0,
+        attention_bias=False,
+        attention_dropout=0.0,
+        query_pre_attn_scalar=256,
+        sliding_window=1024,
+        layer_types=None,
+        layer_sequence=None,
+        final_logit_softcapping=None,
+        attn_logit_softcapping=None,
+        rope_scaling=None,
+        rope_local_base_freq=10_000.0,
+        use_bidirectional_attention=False,
+        **kwargs,
+    ):
+        super().__init__(
+            pad_token_id=pad_token_id,
+            bos_token_id=bos_token_id,
+            eos_token_id=eos_token_id,
+            tie_word_embeddings=tie_word_embeddings,
+            **kwargs,
+        )
+        self.vocab_size = vocab_size
+        self.max_position_embeddings = max_position_embeddings
+        self.hidden_size = hidden_size
+        self.intermediate_size = intermediate_size
+        self.num_hidden_layers = num_hidden_layers
+        self.num_attention_heads = num_attention_heads
+        self.head_dim = head_dim
+        self.num_key_value_heads = num_key_value_heads
+        self.initializer_range = initializer_range
+        self.rms_norm_eps = rms_norm_eps
+        self.use_cache = use_cache
+        self.rope_theta = rope_theta
+        self.attention_bias = attention_bias
+        self.attention_dropout = attention_dropout
+        self.hidden_activation = hidden_activation
+        self.query_pre_attn_scalar = query_pre_attn_scalar
+        self.sliding_window = sliding_window
+        self.final_logit_softcapping = final_logit_softcapping
+        self.attn_logit_softcapping = attn_logit_softcapping
+        self.use_bidirectional_attention = use_bidirectional_attention
+
+        if use_bidirectional_attention:
+            self.sliding_window = (self.sliding_window // 2) + 1
+
+        self.rope_local_base_freq = rope_local_base_freq
+        self.rope_scaling = rope_scaling
+        rope_config_validation(self)
+
+        # Layer sequence for looping - defaults to all layers once
+        if layer_sequence is None:
+            layer_sequence = [[0, num_hidden_layers, 1]]
+        self.layer_sequence = layer_sequence
+
+        # Layer types (sliding vs full attention)
+        self._sliding_window_pattern = kwargs.get("sliding_window_pattern", 6)
+        self.layer_types = layer_types
+        if self.layer_types is None:
+            self.layer_types = [
+                "sliding_attention" if bool((i + 1) % self._sliding_window_pattern) else "full_attention"
+                for i in range(self.num_hidden_layers)
+            ]
+        layer_type_validation(self.layer_types, self.num_hidden_layers)
+
+
+__all__ = ["GemmagainConfig"]

generation_config.json

@@ -0,0 +1,13 @@
+{
+  "bos_token_id": 2,
+  "cache_implementation": "hybrid",
+  "do_sample": true,
+  "eos_token_id": [
+    1,
+    106
+  ],
+  "pad_token_id": 0,
+  "top_k": 64,
+  "top_p": 0.95,
+  "transformers_version": "4.51.0"
+}

model-00001-of-00002.safetensors

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model.safetensors.index.json

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+}

modeling_gemmagain.py

@@ -0,0 +1,573 @@
+# coding=utf-8
+# Copyright 2025 Google Inc. HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Gemmagain - Gemma3 text model with layer looping support.
+
+This model allows running the same physical layers multiple times in sequence,
+enabling parameter-efficient deep networks. Compatible with standard Gemma3 weights.
+"""
+import copy
+from typing import Callable, Optional, Union
+
+import torch
+import torch.nn as nn
+from torch.nn import CrossEntropyLoss
+
+from transformers.activations import ACT2FN
+from transformers.cache_utils import Cache, DynamicCache, DynamicLayer
+from transformers.generation import GenerationMixin
+from transformers.masking_utils import create_causal_mask, create_sliding_window_causal_mask
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_layers import GradientCheckpointingLayer
+from transformers.modeling_outputs import BaseModelOutputWithPast, CausalLMOutputWithPast
+from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
+from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from transformers.processing_utils import Unpack
+from transformers.utils import TransformersKwargs, auto_docstring, can_return_tuple, logging
+from transformers.utils.deprecation import deprecate_kwarg
+
+from .configuration_gemmagain import GemmagainConfig
+
+
+logger = logging.get_logger(__name__)
+
+
+class Gemma3TextScaledWordEmbedding(nn.Embedding):
+    """
+    This module overrides nn.Embeddings' forward by multiplying with embeddings scale.
+    """
+
+    def __init__(self, num_embeddings: int, embedding_dim: int, padding_idx: int, embed_scale: float = 1.0):
+        super().__init__(num_embeddings, embedding_dim, padding_idx)
+        self.register_buffer("embed_scale", torch.tensor(embed_scale), persistent=False)
+
+    def forward(self, input_ids: torch.Tensor):
+        return super().forward(input_ids) * self.embed_scale.to(self.weight.dtype)
+
+
+class Gemma3MLP(nn.Module):
+    def __init__(self, config: GemmagainConfig):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
+        self.act_fn = ACT2FN[config.hidden_activation]
+
+    def forward(self, x):
+        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
+        return down_proj
+
+
+class Gemma3RMSNorm(nn.Module):
+    def __init__(self, dim: int, eps: float = 1e-6):
+        super().__init__()
+        self.eps = eps
+        self.weight = nn.Parameter(torch.zeros(dim))
+
+    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())
+        # Gemma3 uses (x * w).to(dtype) instead of x.to(dtype) * w
+        output = output * (1.0 + self.weight.float())
+        return output.type_as(x)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.eps}"
+
+
+class Gemma3RotaryEmbedding(nn.Module):
+    inv_freq: torch.Tensor
+
+    def __init__(self, config: GemmagainConfig, device=None):
+        super().__init__()
+        if hasattr(config, "rope_scaling") and isinstance(config.rope_scaling, dict):
+            self.rope_type = config.rope_scaling.get("rope_type", config.rope_scaling.get("type"))
+        else:
+            self.rope_type = "default"
+        self.max_seq_len_cached = config.max_position_embeddings
+        self.original_max_seq_len = config.max_position_embeddings
+
+        self.config = config
+        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
+
+        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+        self.original_inv_freq = self.inv_freq
+
+    @torch.no_grad()
+    @dynamic_rope_update
+    def forward(self, x, position_ids):
+        inv_freq_expanded = self.inv_freq[None, :, None].float().expand(position_ids.shape[0], -1, 1).to(x.device)
+        position_ids_expanded = position_ids[:, None, :].float()
+
+        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
+        with torch.autocast(device_type=device_type, enabled=False):
+            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(1, 2)
+            emb = torch.cat((freqs, freqs), dim=-1)
+            cos = emb.cos() * self.attention_scaling
+            sin = emb.sin() * self.attention_scaling
+
+        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors."""
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """Repeat KV heads for GQA."""
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+def eager_attention_forward(
+    module: nn.Module,
+    query: torch.Tensor,
+    key: torch.Tensor,
+    value: torch.Tensor,
+    attention_mask: Optional[torch.Tensor],
+    dropout: float = 0.0,
+    scaling: Optional[float] = None,
+    softcap: Optional[float] = None,
+    **kwargs,
+) -> tuple[torch.Tensor, torch.Tensor]:
+    if scaling is None:
+        scaling = module.head_dim**-0.5
+
+    key_states = repeat_kv(key, module.num_key_value_groups)
+    value_states = repeat_kv(value, module.num_key_value_groups)
+
+    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
+
+    if softcap is not None:
+        attn_weights = attn_weights / softcap
+        attn_weights = torch.tanh(attn_weights)
+        attn_weights = attn_weights * softcap
+    if attention_mask is not None:
+        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
+        attn_weights = attn_weights + causal_mask
+
+    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
+    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
+    attn_output = torch.matmul(attn_weights, value_states)
+    attn_output = attn_output.transpose(1, 2).contiguous()
+    return attn_output, attn_weights
+
+
+class Gemma3Attention(nn.Module):
+    """Multi-headed attention with support for looping (cache_slot_idx)."""
+
+    def __init__(self, config: GemmagainConfig, layer_idx: int):
+        super().__init__()
+        self.is_sliding = config.layer_types[layer_idx] == "sliding_attention"
+        self.config = config
+        self.layer_idx = layer_idx
+        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
+        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
+        self.scaling = config.query_pre_attn_scalar**-0.5
+        self.attention_dropout = self.config.attention_dropout
+        self.is_causal = not self.config.use_bidirectional_attention
+
+        self.q_proj = nn.Linear(
+            config.hidden_size, config.num_attention_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.k_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.v_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.o_proj = nn.Linear(
+            config.num_attention_heads * self.head_dim, config.hidden_size, bias=config.attention_bias
+        )
+        self.attn_logit_softcapping = self.config.attn_logit_softcapping
+        self.sliding_window = config.sliding_window if self.is_sliding else None
+
+        self.q_norm = Gemma3RMSNorm(dim=config.head_dim, eps=config.rms_norm_eps)
+        self.k_norm = Gemma3RMSNorm(dim=config.head_dim, eps=config.rms_norm_eps)
+
+    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: torch.Tensor,
+        attention_mask: Optional[torch.Tensor],
+        past_key_values: Optional[Cache] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        cache_slot_idx: Optional[int] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        key_states = self.k_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+
+        query_states = self.q_norm(query_states)
+        key_states = self.k_norm(key_states)
+
+        cos, sin = position_embeddings
+        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)
+
+        if past_key_values is not None:
+            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
+            # Use cache_slot_idx for looping support - each visit to a layer gets its own cache slot
+            slot_idx = cache_slot_idx if cache_slot_idx is not None else self.layer_idx
+            key_states, value_states = past_key_values.update(key_states, value_states, slot_idx, cache_kwargs)
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]
+
+        attn_output, attn_weights = attention_interface(
+            self,
+            query_states,
+            key_states,
+            value_states,
+            attention_mask,
+            dropout=self.attention_dropout if self.training else 0.0,
+            scaling=self.scaling,
+            sliding_window=self.sliding_window,
+            **kwargs,
+        )
+
+        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
+        attn_output = self.o_proj(attn_output)
+        return attn_output, attn_weights
+
+
+class Gemma3DecoderLayer(GradientCheckpointingLayer):
+    def __init__(self, config: GemmagainConfig, layer_idx: int):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.layer_idx = layer_idx
+        self.attention_type = config.layer_types[layer_idx]
+        self.self_attn = Gemma3Attention(config=config, layer_idx=layer_idx)
+        self.mlp = Gemma3MLP(config)
+        self.input_layernorm = Gemma3RMSNorm(self.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = Gemma3RMSNorm(self.hidden_size, eps=config.rms_norm_eps)
+        self.pre_feedforward_layernorm = Gemma3RMSNorm(self.hidden_size, eps=config.rms_norm_eps)
+        self.post_feedforward_layernorm = Gemma3RMSNorm(self.hidden_size, eps=config.rms_norm_eps)
+
+    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings_global: torch.Tensor,
+        position_embeddings_local: torch.Tensor,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        use_cache: Optional[bool] = False,
+        cache_position: Optional[torch.LongTensor] = None,
+        cache_slot_idx: Optional[int] = None,
+        **kwargs,
+    ) -> torch.Tensor:
+        residual = hidden_states
+
+        hidden_states = self.input_layernorm(hidden_states)
+
+        # Apply global RoPE to non-sliding layers, local RoPE to sliding layers
+        if self.self_attn.is_sliding:
+            position_embeddings = position_embeddings_local
+        else:
+            position_embeddings = position_embeddings_global
+
+        hidden_states, _ = self.self_attn(
+            hidden_states=hidden_states,
+            position_embeddings=position_embeddings,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            cache_slot_idx=cache_slot_idx,
+            **kwargs,
+        )
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states = residual + hidden_states
+
+        residual = hidden_states
+        hidden_states = self.pre_feedforward_layernorm(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = self.post_feedforward_layernorm(hidden_states)
+        hidden_states = residual + hidden_states
+
+        return hidden_states
+
+
+@auto_docstring
+class GemmagainPreTrainedModel(PreTrainedModel):
+    config_class = GemmagainConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _no_split_modules = ["Gemma3DecoderLayer"]
+    _skip_keys_device_placement = ["past_key_values"]
+    _supports_flash_attn = True
+    _supports_sdpa = True
+    _supports_flex_attn = True
+    _can_compile_fullgraph = True
+    _supports_attention_backend = True
+    _can_record_outputs = {
+        "hidden_states": Gemma3DecoderLayer,
+        "attentions": Gemma3Attention,
+    }
+
+    def _init_weights(self, module):
+        super()._init_weights(module)
+        # Initialize RMSNorm weights to 0 (Gemma3 uses 1 + weight)
+        if "RMSNorm" in module.__class__.__name__:
+            module.weight.data.zero_()
+
+
+def _expand_layer_sequence(layer_sequence, num_hidden_layers):
+    """Expand layer_sequence config into a flat list of layer indices."""
+    l_seq = []
+    for item in layer_sequence:
+        if isinstance(item, int):
+            l_seq.append(item)
+        elif isinstance(item, list):
+            if len(item) == 2:
+                start, end = item
+                l_seq += list(range(start, min(end, num_hidden_layers)))
+            elif len(item) == 3:
+                start, end, repeats = item
+                l_seq += list(range(start, min(end, num_hidden_layers))) * repeats
+            else:
+                raise ValueError(f"Invalid layer_sequence item: {item}")
+        else:
+            raise ValueError(f"Invalid layer_sequence item type: {type(item)}")
+    return l_seq
+
+
+def _bidirectional_window_overlay(sliding_window: int) -> Callable[[int, int, int, int], bool]:
+    """Enables a bidirectional mask within the sliding window."""
+    def inner_mask(batch_idx: int, head_idx: int, q_idx: int, kv_idx: int) -> bool:
+        return abs(q_idx - kv_idx) < sliding_window
+    return inner_mask
+
+
+@auto_docstring
+class GemmagainModel(GemmagainPreTrainedModel):
+    def __init__(self, config: GemmagainConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+
+        self.embed_tokens = Gemma3TextScaledWordEmbedding(
+            config.vocab_size, config.hidden_size, self.padding_idx, embed_scale=config.hidden_size**0.5
+        )
+        self.layers = nn.ModuleList(
+            [Gemma3DecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
+        )
+        self.norm = Gemma3RMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = Gemma3RotaryEmbedding(config=config)
+        self.gradient_checkpointing = False
+
+        # Create local RoPE with different theta
+        local_config = copy.deepcopy(config)
+        local_config.rope_theta = config.rope_local_base_freq
+        local_config.rope_scaling = {"rope_type": "default"}
+        self.rotary_emb_local = Gemma3RotaryEmbedding(config=local_config)
+
+        # Pre-compute expanded layer sequence for looping
+        self._layer_sequence = _expand_layer_sequence(config.layer_sequence, config.num_hidden_layers)
+        self._num_cache_slots = len(self._layer_sequence)
+
+        self.post_init()
+
+    @auto_docstring
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> BaseModelOutputWithPast:
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")
+
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+
+        if use_cache:
+            if past_key_values is None:
+                # Create cache with enough slots for the full layer sequence
+                cache_config = copy.copy(self.config)
+                cache_config.num_hidden_layers = self._num_cache_slots
+                past_key_values = DynamicCache(config=cache_config)
+            elif isinstance(past_key_values, DynamicCache) and len(past_key_values.layers) < self._num_cache_slots:
+                # Extend cache if created externally with fewer slots
+                while len(past_key_values.layers) < self._num_cache_slots:
+                    past_key_values.layers.append(DynamicLayer())
+
+        if cache_position is None:
+            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
+            cache_position = torch.arange(
+                past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device
+            )
+
+        if position_ids is None:
+            position_ids = cache_position.unsqueeze(0)
+
+        # Prepare attention masks
+        if not isinstance(causal_mask_mapping := attention_mask, dict):
+            mask_kwargs = {
+                "config": self.config,
+                "input_embeds": inputs_embeds,
+                "attention_mask": attention_mask,
+                "cache_position": cache_position,
+                "past_key_values": past_key_values,
+                "position_ids": position_ids,
+            }
+            sliding_mask_kwargs = mask_kwargs.copy()
+
+            if self.config.use_bidirectional_attention:
+                mask_kwargs["or_mask_function"] = lambda *args: torch.tensor(True, dtype=torch.bool)
+                sliding_mask_kwargs["or_mask_function"] = _bidirectional_window_overlay(self.config.sliding_window)
+
+            causal_mask_mapping = {
+                "full_attention": create_causal_mask(**mask_kwargs),
+                "sliding_attention": create_sliding_window_causal_mask(**sliding_mask_kwargs),
+            }
+
+        hidden_states = inputs_embeds
+        position_embeddings_global = self.rotary_emb(hidden_states, position_ids)
+        position_embeddings_local = self.rotary_emb_local(hidden_states, position_ids)
+
+        # Execute layers in the configured sequence with looping support
+        for cache_slot_idx, layer_idx in enumerate(self._layer_sequence):
+            decoder_layer = self.layers[layer_idx]
+            hidden_states = decoder_layer(
+                hidden_states,
+                position_embeddings_global=position_embeddings_global,
+                position_embeddings_local=position_embeddings_local,
+                attention_mask=causal_mask_mapping[decoder_layer.attention_type],
+                position_ids=position_ids,
+                past_key_values=past_key_values,
+                use_cache=use_cache,
+                cache_position=cache_position,
+                cache_slot_idx=cache_slot_idx,
+                **kwargs,
+            )
+
+        hidden_states = self.norm(hidden_states)
+
+        return BaseModelOutputWithPast(
+            last_hidden_state=hidden_states,
+            past_key_values=past_key_values if use_cache else None,
+        )
+
+
+@auto_docstring
+class GemmagainForCausalLM(GemmagainPreTrainedModel, GenerationMixin):
+    _tied_weights_keys = ["lm_head.weight"]
+    _tp_plan = {"lm_head": "colwise_rep"}
+    _pp_plan = {"lm_head": (["hidden_states"], ["logits"])}
+
+    def __init__(self, config: GemmagainConfig):
+        super().__init__(config)
+        self.model = GemmagainModel(config)
+        self.vocab_size = config.vocab_size
+        self.lm_head = nn.Linear(config.hidden_size, config.vocab_size, bias=False)
+
+        self.post_init()
+
+    @can_return_tuple
+    @auto_docstring
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        logits_to_keep: Union[int, torch.Tensor] = 0,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> CausalLMOutputWithPast:
+        outputs: BaseModelOutputWithPast = self.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,
+            cache_position=cache_position,
+            **kwargs,
+        )
+
+        hidden_states = outputs.last_hidden_state
+        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 self.config.final_logit_softcapping is not None:
+            logits = logits / self.config.final_logit_softcapping
+            logits = torch.tanh(logits)
+            logits = logits * self.config.final_logit_softcapping
+
+        loss = None
+        if labels is not None:
+            # Standard loss calculation
+            shift_logits = logits[..., :-1, :].contiguous()
+            shift_labels = labels[..., 1:].contiguous()
+            loss_fct = CrossEntropyLoss()
+            shift_logits = shift_logits.view(-1, self.config.vocab_size)
+            shift_labels = shift_labels.view(-1)
+            shift_labels = shift_labels.to(shift_logits.device)
+            loss = loss_fct(shift_logits, shift_labels)
+
+        return CausalLMOutputWithPast(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            hidden_states=outputs.hidden_states,
+            attentions=outputs.attentions,
+        )
+
+
+__all__ = [
+    "GemmagainForCausalLM",
+    "GemmagainModel",
+    "GemmagainPreTrainedModel",
+]

special_tokens_map.json

@@ -0,0 +1,33 @@
+{
+  "boi_token": "<start_of_image>",
+  "bos_token": {
+    "content": "<bos>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "eoi_token": "<end_of_image>",
+  "eos_token": {
+    "content": "<eos>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "image_token": "<image_soft_token>",
+  "pad_token": {
+    "content": "<pad>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  },
+  "unk_token": {
+    "content": "<unk>",
+    "lstrip": false,
+    "normalized": false,
+    "rstrip": false,
+    "single_word": false
+  }
+}

tokenizer.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4667f2089529e8e7657cfb6d1c19910ae71ff5f28aa7ab2ff2763330affad795
+size 33384568

tokenizer.model

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:1299c11d7cf632ef3b4e11937501358ada021bbdf7c47638d13c0ee982f2e79c
+size 4689074