feat(rebase + unify subfunctions): rebase to transformers v4.57.3 and align the subfunction changes.

QEfficient/transformers/cache_utils.py

@@ -10,7 +10,7 @@
 from typing import Any, Dict, List, Optional, Tuple
 
 import torch
-from transformers.cache_utils import DynamicCache, DynamicLayer, EncoderDecoderCache, HybridCache, HybridChunkedCache
+from transformers.cache_utils import Cache, CacheLayerMixin, EncoderDecoderCache, HybridCache, HybridChunkedCache
 
 from QEfficient.customop import (
     CtxGatherFunc,
@@ -54,7 +54,47 @@ def _get_invalid_idx_value(cls):
             return 0
 
 
-class QEffDynamicLayer(DynamicLayer):
+class QEffDynamicLayer(CacheLayerMixin):
+    is_sliding = False
+
+    def __init__(self):
+        super().__init__()
+
+    def lazy_initialization(self, key_states: torch.Tensor):
+        self.dtype = key_states.dtype
+        self.device = key_states.device
+        self.keys = torch.tensor([], dtype=self.dtype, device=self.device)
+        self.values = torch.tensor([], dtype=self.dtype, device=self.device)
+        self.is_initialized = True
+
+    def get_mask_sizes(self, cache_position: torch.Tensor) -> tuple[int, int]:
+        kv_offset = 0
+        query_length = cache_position.shape[0]
+        kv_length = self.get_seq_length() + query_length
+        return kv_length, kv_offset
+
+    def get_seq_length(self) -> int:
+        if self.keys is None or self.keys.numel() == 0:
+            return 0
+        return self.keys.shape[-2]
+
+    def get_max_cache_shape(self) -> int:
+        return -1
+
+    @classmethod
+    def from_tensors(cls, key_states: torch.Tensor, value_states: torch.Tensor) -> "QEffDynamicLayer":
+        layer = cls()
+        layer.keys = key_states
+        layer.values = value_states
+        layer._mark_initialized(key_states)
+        return layer
+
+    def _mark_initialized(self, reference_states: torch.Tensor) -> None:
+        if not self.is_initialized:
+            self.dtype = reference_states.dtype
+            self.device = reference_states.device
+            self.is_initialized = True
+
     def read_only(self, cache_kwargs):
         """
         Reads the `key_states` and `value_states` for the layer.
@@ -68,6 +108,8 @@ def read_only(self, cache_kwargs):
         """
         # Gather
         k_out, v_out = self.keys, self.values
+        if k_out is not None:
+            self._mark_initialized(k_out)
         position_ids = cache_kwargs.get("position_ids")
         batch_index = cache_kwargs.get("batch_index", None)
         ctx_len = cache_kwargs.get("CCL", k_out.shape[2])
@@ -109,6 +151,8 @@ def read_only_blockedKV(self, start_index, end_index, cache_kwargs):
         """
         # Gather
         k_out, v_out = self.keys, self.values
+        if k_out is not None:
+            self._mark_initialized(k_out)
         position_ids = cache_kwargs.get("position_ids")
         batch_index = cache_kwargs.get("batch_index", None)
         batch, num_kv_heads, _, _ = k_out.shape
@@ -150,7 +194,9 @@ def write_only(self, key_states, value_states, cache_kwargs):
         if self.keys is None:
             self.keys = key_states
             self.values = value_states
+            self._mark_initialized(self.keys)
         else:
+            self._mark_initialized(self.keys)
             position_ids = cache_kwargs.get("position_ids")
             batch_index = cache_kwargs.get("batch_index", None)  # Check and fetch batch index value form the kwargs
 
@@ -189,8 +235,10 @@ def update(
         if self.keys is None:
             self.keys = key_states
             self.values = value_states
+            self._mark_initialized(self.keys)
             k_out, v_out = self.keys, self.values
         else:
+            self._mark_initialized(self.keys)
             position_ids = cache_kwargs.get("position_ids")
             batch_index = cache_kwargs.get("batch_index", None)  # Check and fetch batch index value form the kwargs
 
@@ -252,8 +300,10 @@ def update3D(
         if self.keys is None:
             self.keys = key_states
             self.values = value_states
+            self._mark_initialized(self.keys)
             k_out, v_out = self.keys, self.values
         else:
+            self._mark_initialized(self.keys)
             position_ids = cache_kwargs.get("position_ids")
             batch_index = cache_kwargs.get("batch_index", None)
 
@@ -293,7 +343,7 @@ def update3D(
         return k_out, v_out
 
 
-class QEffDynamicCache(DynamicCache):
+class QEffDynamicCache(Cache):
     """
     A cache that grows dynamically as more tokens are generated. This is the default for generative models.
 
@@ -307,15 +357,46 @@ class QEffDynamicCache(DynamicCache):
     """
 
     def __init__(self, ddp_cache_data: Optional[Iterable[tuple[torch.Tensor, torch.Tensor]]] = None, *args, **kwargs):
-        # Remove layer_classes if present to avoid duplicate argument
+        # Remove cache-layer construction args if present to avoid duplicate arguments.
         kwargs.pop("layer_classes", None)
-        from transformers.cache_utils import Cache  # Import here to avoid circular import
-
-        Cache.__init__(self, layer_classes=QEffDynamicLayer, *args, **kwargs)
+        kwargs.pop("layers", None)
+        kwargs.pop("layer_class_to_replicate", None)
+
+        try:
+            # transformers>=4.57
+            Cache.__init__(self, *args, layer_class_to_replicate=QEffDynamicLayer, **kwargs)
+        except TypeError:
+            # transformers<=4.56
+            Cache.__init__(self, *args, layer_classes=QEffDynamicLayer, **kwargs)
         if ddp_cache_data is not None:
             for key_states, value_states in ddp_cache_data:
                 self.layers.append(QEffDynamicLayer.from_tensors(key_states, value_states))
 
+    def append_new_layers(self, layer_idx: int) -> None:
+        while len(self.layers) <= layer_idx:
+            self.layers.append(QEffDynamicLayer())
+
+    @classmethod
+    def from_legacy_cache(cls, past_key_values: Optional[Tuple[Tuple[torch.FloatTensor]]] = None) -> "QEffDynamicCache":
+        cache = cls()
+        if past_key_values is not None:
+            for layer_idx in range(len(past_key_values)):
+                key_states, value_states = past_key_values[layer_idx]
+                cache.update(key_states, value_states, layer_idx)
+        return cache
+
+    def to_legacy_cache(self) -> Tuple[Tuple[torch.Tensor, torch.Tensor]]:
+        legacy_cache = ()
+        for layer in self.layers:
+            legacy_cache += ((layer.keys, layer.values),)
+        return legacy_cache
+
+    def get_seq_length(self, layer_idx: Optional[int] = 0, cache_position: Optional[torch.LongTensor] = None) -> int:
+        """
+        Keep backward-compatible call shape while deferring to upstream implementation.
+        """
+        return super().get_seq_length(layer_idx)
+
     def read_only(self, layer_idx, cache_kwargs):
         """
         Reads the `key_states` and `value_states` for the layer `layer_idx`.
@@ -405,10 +486,7 @@ def from_legacy_cache(
         cls, past_key_values: Optional[Tuple[Tuple[torch.FloatTensor]]] = None
     ) -> "EncoderDecoderCache":
         """Converts a cache in the legacy cache format into an equivalent `EncoderDecoderCache`."""
-        cache = cls(
-            self_attention_cache=QEffDynamicCache(),
-            cross_attention_cache=QEffDynamicCache(),
-        )
+        cache = cls(QEffDynamicCache(), QEffDynamicCache())
         if past_key_values is not None:
             for layer_idx in range(len(past_key_values)):
                 key_states, value_states = past_key_values[layer_idx][:2]
@@ -419,6 +497,18 @@ def from_legacy_cache(
                     cache.is_updated[layer_idx] = True
         return cache
 
+    def to_legacy_cache(self):
+        self_attn_legacy = self.self_attention_cache.to_legacy_cache()
+        cross_attn_legacy = self.cross_attention_cache.to_legacy_cache()
+
+        legacy_cache = ()
+        for layer_idx, self_attn_layer in enumerate(self_attn_legacy):
+            if layer_idx < len(cross_attn_legacy):
+                legacy_cache += (self_attn_layer + cross_attn_legacy[layer_idx],)
+            else:
+                legacy_cache += (self_attn_layer,)
+        return legacy_cache
+
 
 # TODO:This function will be depercated in future.
 class QEffHybridCache(HybridCache):
@@ -447,7 +537,7 @@ def __len__(self):
         """
         return len(self.key_cache)
 
-    def get_seq_length(self, layer_idx: Optional[int] = 0) -> int:
+    def get_seq_length(self, layer_idx: Optional[int] = 0, cache_position: Optional[torch.LongTensor] = None) -> int:
         """Returns the sequence length of the cached states. A layer index can be optionally passed."""
         # TODO: deprecate this function in favor of `cache_position`
         is_empty_layer = (
@@ -531,7 +621,7 @@ def __len__(self):
         """
         return len(self.key_cache)
 
-    def get_seq_length(self, layer_idx: Optional[int] = 0) -> int:
+    def get_seq_length(self, layer_idx: Optional[int] = 0, cache_position: Optional[torch.LongTensor] = None) -> int:
         """Returns the sequence length of the cached states. A layer index can be optionally passed."""
         # TODO: deprecate this function in favor of `cache_position`
         is_empty_layer = (
@@ -663,7 +753,7 @@ def __len__(self):
         """
         return len(self.key_cache)
 
-    def get_seq_length(self, layer_idx: Optional[int] = 0) -> int:
+    def get_seq_length(self, layer_idx: Optional[int] = 0, cache_position: Optional[torch.LongTensor] = None) -> int:
         """Returns the sequence length of the cached states. A layer index can be optionally passed."""
         # TODO: deprecate this function in favor of `cache_position`
         is_empty_layer = (
@@ -783,7 +873,7 @@ def __len__(self):
         """
         return len(self.key_cache)
 
-    def get_seq_length(self, layer_idx: Optional[int] = 0) -> int:
+    def get_seq_length(self, layer_idx: Optional[int] = 0, cache_position: Optional[torch.LongTensor] = None) -> int:
         """Returns the sequence length of the cached states. A layer index can be optionally passed."""
         # TODO: deprecate this function in favor of `cache_position`
         is_empty_layer = (

QEfficient/transformers/modeling_utils.py

@@ -191,6 +191,7 @@
     ]
 )
 
+
 # This is for supporting different seq_len for different layers for Sliding window attn, chunked attn etc.
 DYNAMIC_SEQ_LEN_SUPPORTED_MODEL_ARCH = {"gemma3", "llama4", "gemma3_text", "llama4_text"}
 

QEfficient/transformers/models/falcon/modeling_falcon.py

@@ -59,16 +59,6 @@ def _set_cos_sin_cache(self, seq_len, device, dtype):
         self.register_buffer("cos_cached", emb.cos().to(dtype), persistent=False)
         self.register_buffer("sin_cached", emb.sin().to(dtype), persistent=False)
 
-    def forward(self, x, seq_len=None):
-        # x: [bs, num_attention_heads, seq_len, head_size]
-        if seq_len > self.max_seq_len_cached:
-            self._set_cos_sin_cache(seq_len=seq_len, device=x.device, dtype=x.dtype)
-
-        return (
-            self.cos_cached[:seq_len].to(dtype=x.dtype) * self.attention_scaling,
-            self.sin_cached[:seq_len].to(dtype=x.dtype) * self.attention_scaling,
-        )
-
 
 def qeff_apply_rotary_pos_emb(q, k, cos, sin, position_ids, unsqueeze_dim=1):
     """Applies Rotary Position Embedding to the query and key tensors.
@@ -108,9 +98,6 @@ class QEffFalconAttention(FalconAttention):
     - add new args position idx for the cache_kwargs for kv retention
     """
 
-    def __qeff_init__(self):
-        self.rotary_emb = QEffFalconRotaryEmbedding(config=self.config)
-
     def forward(
         self,
         hidden_states: torch.Tensor,
@@ -125,6 +112,8 @@ def forward(
         use_cache: bool = False,
         output_attentions: bool = False,
         cache_position: Optional[torch.LongTensor] = None,
+        cos_cached: Optional[torch.Tensor] = None,
+        sin_cached: Optional[torch.Tensor] = None,
     ):
         fused_qkv = self.query_key_value(hidden_states)  # [batch_size, seq_length, 3 x hidden_size]
         num_kv_heads = self.num_heads if self.new_decoder_architecture else self.num_kv_heads
@@ -137,9 +126,8 @@ def forward(
         key_layer = key_layer.transpose(1, 2).reshape(batch_size, num_kv_heads, query_length, self.head_dim)
         value_layer = value_layer.transpose(1, 2).reshape(batch_size, num_kv_heads, query_length, self.head_dim)
 
-        kv_seq_len = past_key_value.get_seq_length(self.layer_idx, cache_position)
-        cos, sin = self.rotary_emb(value_layer, seq_len=kv_seq_len)
-        query_layer, key_layer = qeff_apply_rotary_pos_emb(query_layer, key_layer, cos, sin, position_ids)
+        # kv_seq_len = past_key_value.get_seq_length(self.layer_idx, cache_position)
+        query_layer, key_layer = qeff_apply_rotary_pos_emb(query_layer, key_layer, cos_cached, sin_cached, position_ids)
 
         if layer_past is not None:
             cache_kwargs = {"batch_index": batch_index, "position_ids": position_ids}
@@ -184,6 +172,8 @@ def forward(
         use_cache: bool = False,
         output_attentions: bool = False,
         cache_position: Optional[torch.LongTensor] = None,
+        sin_cached=None,
+        cos_cached=None,
         **kwargs,
     ):
         residual = hidden_states
@@ -208,6 +198,8 @@ def forward(
             use_cache=use_cache,
             output_attentions=output_attentions,
             cache_position=cache_position,
+            sin_cached=sin_cached,
+            cos_cached=cos_cached,
         )
 
         if not self.config.new_decoder_architecture:
@@ -245,6 +237,11 @@ class QEffFalconModel(FalconModel):
     - update causal attention mask
     """
 
+    def __qeff_init__(self):
+        self.rotary_emb = QEffFalconRotaryEmbedding(config=self.config)
+        self.sin_cached = torch.nn.Parameter(self.rotary_emb.sin_cached * self.rotary_emb.attention_scaling)
+        self.cos_cached = torch.nn.Parameter(self.rotary_emb.cos_cached * self.rotary_emb.attention_scaling)
+
     def forward(
         self,
         input_ids: torch.LongTensor = None,
@@ -322,6 +319,8 @@ def forward(
                 output_attentions=output_attentions,
                 alibi=alibi,
                 cache_position=cache_position,
+                sin_cached=self.sin_cached,
+                cos_cached=self.cos_cached,
             )
 
             hidden_states = outputs[0]