Make StaticCache configurable at model construct time

docs/source/en/main_classes/executorch.md

@@ -0,0 +1,31 @@
+<!--Copyright 2024 The HuggingFace 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.
+
+⚠️ Note that this file is in Markdown but contain specific syntax for our doc-builder (similar to MDX) that may not be
+rendered properly in your Markdown viewer.
+
+-->
+
+# ExecuTorch
+
+[`ExecuTorch`](https://github.com/pytorch/executorch) is an end-to-end solution for enabling on-device inference capabilities across mobile and edge devices including wearables, embedded devices and microcontrollers. It is part of the PyTorch ecosystem and supports the deployment of PyTorch models with a focus on portability, productivity, and performance.
+
+ExecuTorch introduces well defined entry points to perform model, device, and/or use-case specific optimizations such as backend delegation, user-defined compiler transformations, memory planning, and more. The first step in preparing a PyTorch model for execution on an edge device using ExecuTorch is to export the model. This is achieved through the use of a PyTorch API called [`torch.export`](https://pytorch.org/docs/stable/export.html).
+
+
+## ExecuTorch Integration
+
+An integration point is being developed to ensure that 🤗 Transformers can be exported using `torch.export`. The goal of this integration is not only to enable export but also to ensure that the exported artifact can be further lowered and optimized to run efficiently in `ExecuTorch`, particularly for mobile and edge use cases.
+
+[[autodoc]] integrations.executorch.TorchExportableModuleWithStaticCache
+    - forward
+
+[[autodoc]] integrations.executorch.convert_and_export_with_cache

src/transformers/__init__.py

@@ -1309,6 +1309,12 @@
             "WhisperTimeStampLogitsProcessor",
         ]
     )
+
+    # PyTorch domain libraries integration
+    _import_structure["integrations.executorch"] = []
+    _import_structure["integrations.executorch"].append("TorchExportableModuleWithStaticCache")
+    _import_structure["integrations.executorch"].append("convert_and_export_with_cache")
+
     _import_structure["modeling_flash_attention_utils"] = []
     _import_structure["modeling_outputs"] = []
     _import_structure["modeling_rope_utils"] = ["ROPE_INIT_FUNCTIONS"]
@@ -6074,6 +6080,10 @@
             WatermarkLogitsProcessor,
             WhisperTimeStampLogitsProcessor,
         )
+        from .integrations.executorch import (
+            TorchExportableModuleWithStaticCache,
+            convert_and_export_with_cache,
+        )
         from .modeling_rope_utils import ROPE_INIT_FUNCTIONS
         from .modeling_utils import PreTrainedModel
         from .models.albert import (

src/transformers/cache_utils.py

@@ -293,6 +293,46 @@ def validate(self):
             )
 
 
+@dataclass
+class StaticCacheConfig(CacheConfig):
+    """
+    Configuration class for static cache settings.
+    """
+
+    cache_implementation = "static"
+
+    def __init__(self, batch_size: int, max_cache_len: int, device="cpu"):
+        self.batch_size = batch_size
+        self.max_cache_len = max_cache_len
+        self.device = device
+
+    def validate(self):
+        """Validates if the arguments passed are correct"""
+
+        incorrect_arg_msg = (
+            "Some of the keys in `cache_config` are defined incorrectly. `{key}` should be {correct_value}` "
+            "but found {found_value}"
+        )
+
+        if self.batch_size <= 0:
+            raise ValueError(
+                incorrect_arg_msg.format(
+                    key="batch_size",
+                    correct_value="> 0",
+                    found_value=self.batch_size,
+                ),
+            )
+
+        if self.max_cache_len <= 0:
+            raise ValueError(
+                incorrect_arg_msg.format(
+                    key="max_cache_len",
+                    correct_value="> 0",
+                    found_value=self.max_cache_len,
+                ),
+            )
+
+
 class DynamicCache(Cache):
     """
     A cache that grows dynamically as more tokens are generated. This is the default for generative models.

src/transformers/generation/configuration_utils.py

@@ -45,9 +45,10 @@
 NEEDS_CACHE_CONFIG = {}
 
 if is_torch_available():
-    from ..cache_utils import QuantizedCacheConfig
+    from ..cache_utils import QuantizedCacheConfig, StaticCacheConfig
 
     NEEDS_CACHE_CONFIG["quantized"] = QuantizedCacheConfig
+    NEEDS_CACHE_CONFIG["static"] = StaticCacheConfig
 
 
 class GenerationMode(ExplicitEnum):

src/transformers/integrations/executorch.py

@@ -0,0 +1,147 @@
+import torch
+
+from transformers import (
+    PreTrainedModel,
+    StaticCache,
+)
+from transformers.pytorch_utils import is_torch_greater_or_equal_than_2_3
+
+
+class TorchExportableModuleWithStaticCache(torch.nn.Module):
+    """
+    A wrapper module designed to make a `PreTrainedModel` exportable with `torch.export`,
+    specifically for use with static caching. This module ensures that the exported model
+    is compatible with further lowering and execution in `ExecuTorch`.
+
+    Note:
+        This class is specifically designed to support export process using `torch.export`
+        in a way that ensures the model can be further lowered and run efficiently in `ExecuTorch`.
+    """
+
+    def __init__(self, model: PreTrainedModel):
+        """
+        Initializes the wrapper module with the pretrained model.
+
+        Args:
+            model (`PreTrainedModel`): The pretrained model to wrap. The model must have caching
+            enabled and use a 'static' caching implementation.
+
+        Raises:
+            AssertionError: If the pretrained model does not have caching enabled or if it does
+            not use a 'static' caching implementation in `model.generation_config`.
+        """
+        super().__init__()
+
+        # Sanity checks
+        if model.generation_config is None:
+            raise AssertionError(
+                "The model must have a generation config to be exported with static caching. "
+                "Please set `generation_config`."
+            )
+
+        if not model.generation_config.use_cache:
+            raise AssertionError(
+                "The model must have caching enabled to be exported with static caching. "
+                "Please set `generation_config.use_cache=True`."
+            )
+
+        if model.generation_config.cache_implementation != "static":
+            raise AssertionError(
+                "The model must use a 'static' caching implementation to be exported with static caching. "
+                "Please set `generation_config.cache_implementation='static'`."
+            )
+
+        self.model = model
+        self.static_cache = StaticCache(
+            config=self.model.config,
+            batch_size=self.model.generation_config.cache_config.batch_size,
+            max_cache_len=self.model.generation_config.cache_config.max_cache_len,
+            dtype=self.model.config.torch_dtype,
+        )
+        self.is_causal = any("CausalLM" in arch for arch in self.model.config.architectures)
+        if self.is_causal:
+            causal_mask = torch.tril(
+                torch.ones(
+                    self.static_cache.max_cache_len,
+                    self.static_cache.max_cache_len,
+                    dtype=torch.bool,
+                )
+            )
+            self.register_buffer("mask", causal_mask, persistent=False)
+
+    def forward(self, input_ids: torch.Tensor, cache_position: torch.Tensor):
+        """
+        Forward pass of the module, which is compatible with the ExecuTorch runtime.
+
+        Args:
+            input_ids (`torch.Tensor`): Tensor representing current input token id to the module.
+            cache_position (`torch.Tensor`): Tensor representing current input position in the cache.
+
+        Returns:
+            torch.Tensor: Logits output from the model.
+
+        This forward adapter serves two primary purposes:
+
+        1. **Making the Model `torch.export`-Compatible**:
+            The adapter hides unsupported objects, such as the `Cache`, from the graph inputs and outputs,
+            enabling the model to be exportable using `torch.export` without encountering issues.
+
+        2. **Ensuring Compatibility with `ExecuTorch` runtime**:
+            The adapter matches the model's forward signature with that in `executorch/extension/llm/runner`,
+            ensuring that the exported model can be executed in `ExecuTorch` out-of-the-box.
+        """
+        _, seqlen = input_ids.shape
+        attn_mask = self.mask[cache_position, :seqlen] if self.is_causal else None
+        outs = self.model(
+            input_ids=input_ids,
+            attention_mask=attn_mask,
+            position_ids=cache_position.unsqueeze(0),
+            cache_position=cache_position,
+            past_key_values=self.static_cache,
+            use_cache=True,
+        )
+        return outs.logits
+
+
+def convert_and_export_with_cache(
+    model: PreTrainedModel,
+    example_input_ids: torch.Tensor = None,
+    example_cache_position: torch.Tensor = None,
+):
+    """
+    Convert a `PreTrainedModel` into an exportable module and export it using `torch.export`,
+    ensuring the exported model is compatible with `ExecuTorch`.
+
+    Args:
+        model (`PreTrainedModel`): The pretrained model to be exported.
+        example_input_ids (`torch.Tensor`): Example input token id used by `torch.export`.
+        example_cache_position (`torch.Tensor`): Example current cache position used by `torch.export`.
+
+    Returns:
+        Exported program (`torch.export.ExportedProgram`): The exported program generated via `torch.export`.
+    """
+
+    if not is_torch_greater_or_equal_than_2_3:
+        raise ImportError("torch >= 2.3 is required.")
+
+    import torch.export._trace
+
+    with torch.no_grad():
+        # TODO: The default inputs only work for text models. We need to add support for vision/audio models.
+        example_input_ids = (
+            example_input_ids if example_input_ids is not None else torch.tensor([[1]], dtype=torch.long)
+        )
+        example_cache_position = (
+            example_cache_position if example_cache_position is not None else torch.tensor([0], dtype=torch.long)
+        )
+
+        # Due to issue https://github.com/pytorch/pytorch/issues/128394, we need to switch to use an internal
+        # export API and pre_dispatch=False. Switch to use the public API once the issue is included in 2.5 release.
+        exported_program = torch.export._trace._export(
+            TorchExportableModuleWithStaticCache(model),
+            args=(example_input_ids,),
+            kwargs={"cache_position": example_cache_position},
+            pre_dispatch=False,
+            strict=True,
+        )
+        return exported_program

src/transformers/modeling_utils.py

@@ -3184,6 +3184,7 @@ def from_pretrained(
         adapter_kwargs = kwargs.pop("adapter_kwargs", {})
         adapter_name = kwargs.pop("adapter_name", "default")
         use_flash_attention_2 = kwargs.pop("use_flash_attention_2", False)
+        generation_config = kwargs.pop("generation_config", None)
 
         gguf_file = kwargs.pop("gguf_file", None)
         # Cache path to the GGUF file
@@ -3959,7 +3960,10 @@ def from_pretrained(
         model.eval()
 
         # If it is a model with generation capabilities, attempt to load the generation config
-        if model.can_generate() and pretrained_model_name_or_path is not None:
+        if model.can_generate() and generation_config is not None:
+            logger.info("The user-defined `generation_config` will be used to override the default generation config.")
+            model.generation_config = model.generation_config.from_dict(generation_config.to_dict())
+        elif model.can_generate() and pretrained_model_name_or_path is not None:
             try:
                 model.generation_config = GenerationConfig.from_pretrained(
                     pretrained_model_name_or_path,

src/transformers/utils/dummy_pt_objects.py

@@ -513,6 +513,17 @@ def __init__(self, *args, **kwargs):
         requires_backends(self, ["torch"])
 
 
+class TorchExportableModuleWithStaticCache(metaclass=DummyObject):
+    _backends = ["torch"]
+
+    def __init__(self, *args, **kwargs):
+        requires_backends(self, ["torch"])
+
+
+def convert_and_export_with_cache(*args, **kwargs):
+    requires_backends(convert_and_export_with_cache, ["torch"])
+
+
 ROPE_INIT_FUNCTIONS = None