[quant] QoL improvements for pipeline-level quant config

src/diffusers/__init__.py

@@ -38,6 +38,7 @@
     "loaders": ["FromOriginalModelMixin"],
     "models": [],
     "pipelines": [],
+    "quantizers.pipe_quant_config": ["PipelineQuantizationConfig"],
     "quantizers.quantization_config": [],
     "schedulers": [],
     "utils": [

src/diffusers/pipelines/pipeline_utils.py

@@ -1096,6 +1096,8 @@ def load_module(name, value):
         model.register_to_config(_name_or_path=pretrained_model_name_or_path)
         if device_map is not None:
             setattr(model, "hf_device_map", final_device_map)
+        if quantization_config is not None:
+            setattr(model, "quantization_config", quantization_config)
         return model
 
     @property

src/diffusers/quantizers/__init__.py

@@ -12,183 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import inspect
-from typing import Dict, List, Optional, Union
 
-from ..utils import is_transformers_available, logging
 from .auto import DiffusersAutoQuantizer
 from .base import DiffusersQuantizer
-from .quantization_config import QuantizationConfigMixin as DiffQuantConfigMixin
-
-
-try:
-    from transformers.utils.quantization_config import QuantizationConfigMixin as TransformersQuantConfigMixin
-except ImportError:
-
-    class TransformersQuantConfigMixin:
-        pass
-
-
-logger = logging.get_logger(__name__)
-
-
-class PipelineQuantizationConfig:
-    """
-    Configuration class to be used when applying quantization on-the-fly to [`~DiffusionPipeline.from_pretrained`].
-
-    Args:
-        quant_backend (`str`): Quantization backend to be used. When using this option, we assume that the backend
-            is available to both `diffusers` and `transformers`.
-        quant_kwargs (`dict`): Params to initialize the quantization backend class.
-        components_to_quantize (`list`): Components of a pipeline to be quantized.
-        quant_mapping (`dict`): Mapping defining the quantization specs to be used for the pipeline
-            components. When using this argument, users are not expected to provide `quant_backend`, `quant_kawargs`,
-            and `components_to_quantize`.
-    """
-
-    def __init__(
-        self,
-        quant_backend: str = None,
-        quant_kwargs: Dict[str, Union[str, float, int, dict]] = None,
-        components_to_quantize: Optional[List[str]] = None,
-        quant_mapping: Dict[str, Union[DiffQuantConfigMixin, "TransformersQuantConfigMixin"]] = None,
-    ):
-        self.quant_backend = quant_backend
-        # Initialize kwargs to be {} to set to the defaults.
-        self.quant_kwargs = quant_kwargs or {}
-        self.components_to_quantize = components_to_quantize
-        self.quant_mapping = quant_mapping
-
-        self.post_init()
-
-    def post_init(self):
-        quant_mapping = self.quant_mapping
-        self.is_granular = True if quant_mapping is not None else False
-
-        self._validate_init_args()
-
-    def _validate_init_args(self):
-        if self.quant_backend and self.quant_mapping:
-            raise ValueError("Both `quant_backend` and `quant_mapping` cannot be specified at the same time.")
-
-        if not self.quant_mapping and not self.quant_backend:
-            raise ValueError("Must provide a `quant_backend` when not providing a `quant_mapping`.")
-
-        if not self.quant_kwargs and not self.quant_mapping:
-            raise ValueError("Both `quant_kwargs` and `quant_mapping` cannot be None.")
-
-        if self.quant_backend is not None:
-            self._validate_init_kwargs_in_backends()
-
-        if self.quant_mapping is not None:
-            self._validate_quant_mapping_args()
-
-    def _validate_init_kwargs_in_backends(self):
-        quant_backend = self.quant_backend
-
-        self._check_backend_availability(quant_backend)
-
-        quant_config_mapping_transformers, quant_config_mapping_diffusers = self._get_quant_config_list()
-
-        if quant_config_mapping_transformers is not None:
-            init_kwargs_transformers = inspect.signature(quant_config_mapping_transformers[quant_backend].__init__)
-            init_kwargs_transformers = {name for name in init_kwargs_transformers.parameters if name != "self"}
-        else:
-            init_kwargs_transformers = None
-
-        init_kwargs_diffusers = inspect.signature(quant_config_mapping_diffusers[quant_backend].__init__)
-        init_kwargs_diffusers = {name for name in init_kwargs_diffusers.parameters if name != "self"}
-
-        if init_kwargs_transformers != init_kwargs_diffusers:
-            raise ValueError(
-                "The signatures of the __init__ methods of the quantization config classes in `diffusers` and `transformers` don't match. "
-                f"Please provide a `quant_mapping` instead, in the {self.__class__.__name__} class. Refer to [the docs](https://huggingface.co/docs/diffusers/main/en/quantization/overview#pipeline-level-quantization) to learn more about how "
-                "this mapping would look like."
-            )
-
-    def _validate_quant_mapping_args(self):
-        quant_mapping = self.quant_mapping
-        transformers_map, diffusers_map = self._get_quant_config_list()
-
-        available_transformers = list(transformers_map.values()) if transformers_map else None
-        available_diffusers = list(diffusers_map.values())
-
-        for module_name, config in quant_mapping.items():
-            if any(isinstance(config, cfg) for cfg in available_diffusers):
-                continue
-
-            if available_transformers and any(isinstance(config, cfg) for cfg in available_transformers):
-                continue
-
-            if available_transformers:
-                raise ValueError(
-                    f"Provided config for module_name={module_name} could not be found. "
-                    f"Available diffusers configs: {available_diffusers}; "
-                    f"Available transformers configs: {available_transformers}."
-                )
-            else:
-                raise ValueError(
-                    f"Provided config for module_name={module_name} could not be found. "
-                    f"Available diffusers configs: {available_diffusers}."
-                )
-
-    def _check_backend_availability(self, quant_backend: str):
-        quant_config_mapping_transformers, quant_config_mapping_diffusers = self._get_quant_config_list()
-
-        available_backends_transformers = (
-            list(quant_config_mapping_transformers.keys()) if quant_config_mapping_transformers else None
-        )
-        available_backends_diffusers = list(quant_config_mapping_diffusers.keys())
-
-        if (
-            available_backends_transformers and quant_backend not in available_backends_transformers
-        ) or quant_backend not in quant_config_mapping_diffusers:
-            error_message = f"Provided quant_backend={quant_backend} was not found."
-            if available_backends_transformers:
-                error_message += f"\nAvailable ones (transformers): {available_backends_transformers}."
-            error_message += f"\nAvailable ones (diffusers): {available_backends_diffusers}."
-            raise ValueError(error_message)
-
-    def _resolve_quant_config(self, is_diffusers: bool = True, module_name: str = None):
-        quant_config_mapping_transformers, quant_config_mapping_diffusers = self._get_quant_config_list()
-
-        quant_mapping = self.quant_mapping
-        components_to_quantize = self.components_to_quantize
-
-        # Granular case
-        if self.is_granular and module_name in quant_mapping:
-            logger.debug(f"Initializing quantization config class for {module_name}.")
-            config = quant_mapping[module_name]
-            return config
-
-        # Global config case
-        else:
-            should_quantize = False
-            # Only quantize the modules requested for.
-            if components_to_quantize and module_name in components_to_quantize:
-                should_quantize = True
-            # No specification for `components_to_quantize` means all modules should be quantized.
-            elif not self.is_granular and not components_to_quantize:
-                should_quantize = True
-
-            if should_quantize:
-                logger.debug(f"Initializing quantization config class for {module_name}.")
-                mapping_to_use = quant_config_mapping_diffusers if is_diffusers else quant_config_mapping_transformers
-                quant_config_cls = mapping_to_use[self.quant_backend]
-                quant_kwargs = self.quant_kwargs
-                return quant_config_cls(**quant_kwargs)
-
-        # Fallback: no applicable configuration found.
-        return None
-
-    def _get_quant_config_list(self):
-        if is_transformers_available():
-            from transformers.quantizers.auto import (
-                AUTO_QUANTIZATION_CONFIG_MAPPING as quant_config_mapping_transformers,
-            )
-        else:
-            quant_config_mapping_transformers = None
-
-        from ..quantizers.auto import AUTO_QUANTIZATION_CONFIG_MAPPING as quant_config_mapping_diffusers
-
-        return quant_config_mapping_transformers, quant_config_mapping_diffusers
+from .pipe_quant_config import PipelineQuantizationConfig