[refactor] DiffusionPipeline.download (#9557)

* update

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Dhruv Nair <dhruv.nair@gmail.com>

src/diffusers/pipelines/pipeline_loading_utils.py

@@ -838,3 +838,108 @@ def _update_init_kwargs_with_connected_pipeline(
         )
 
     return init_kwargs
+
+
+def _get_custom_components_and_folders(
+    pretrained_model_name: str,
+    config_dict: Dict[str, Any],
+    filenames: Optional[List[str]] = None,
+    variant_filenames: Optional[List[str]] = None,
+    variant: Optional[str] = None,
+):
+    config_dict = config_dict.copy()
+
+    # retrieve all folder_names that contain relevant files
+    folder_names = [k for k, v in config_dict.items() if isinstance(v, list) and k != "_class_name"]
+
+    diffusers_module = importlib.import_module(__name__.split(".")[0])
+    pipelines = getattr(diffusers_module, "pipelines")
+
+    # optionally create a custom component <> custom file mapping
+    custom_components = {}
+    for component in folder_names:
+        module_candidate = config_dict[component][0]
+
+        if module_candidate is None or not isinstance(module_candidate, str):
+            continue
+
+        # We compute candidate file path on the Hub. Do not use `os.path.join`.
+        candidate_file = f"{component}/{module_candidate}.py"
+
+        if candidate_file in filenames:
+            custom_components[component] = module_candidate
+        elif module_candidate not in LOADABLE_CLASSES and not hasattr(pipelines, module_candidate):
+            raise ValueError(
+                f"{candidate_file} as defined in `model_index.json` does not exist in {pretrained_model_name} and is not a module in 'diffusers/pipelines'."
+            )
+
+    if len(variant_filenames) == 0 and variant is not None:
+        error_message = f"You are trying to load the model files of the `variant={variant}`, but no such modeling files are available."
+        raise ValueError(error_message)
+
+    return custom_components, folder_names
+
+
+def _get_ignore_patterns(
+    passed_components,
+    model_folder_names: List[str],
+    model_filenames: List[str],
+    variant_filenames: List[str],
+    use_safetensors: bool,
+    from_flax: bool,
+    allow_pickle: bool,
+    use_onnx: bool,
+    is_onnx: bool,
+    variant: Optional[str] = None,
+) -> List[str]:
+    if (
+        use_safetensors
+        and not allow_pickle
+        and not is_safetensors_compatible(
+            model_filenames, passed_components=passed_components, folder_names=model_folder_names
+        )
+    ):
+        raise EnvironmentError(
+            f"Could not find the necessary `safetensors` weights in {model_filenames} (variant={variant})"
+        )
+
+    if from_flax:
+        ignore_patterns = ["*.bin", "*.safetensors", "*.onnx", "*.pb"]
+
+    elif use_safetensors and is_safetensors_compatible(
+        model_filenames, passed_components=passed_components, folder_names=model_folder_names
+    ):
+        ignore_patterns = ["*.bin", "*.msgpack"]
+
+        use_onnx = use_onnx if use_onnx is not None else is_onnx
+        if not use_onnx:
+            ignore_patterns += ["*.onnx", "*.pb"]
+
+        safetensors_variant_filenames = {f for f in variant_filenames if f.endswith(".safetensors")}
+        safetensors_model_filenames = {f for f in model_filenames if f.endswith(".safetensors")}
+        if len(safetensors_variant_filenames) > 0 and safetensors_model_filenames != safetensors_variant_filenames:
+            logger.warning(
+                f"\nA mixture of {variant} and non-{variant} filenames will be loaded.\nLoaded {variant} filenames:\n"
+                f"[{', '.join(safetensors_variant_filenames)}]\nLoaded non-{variant} filenames:\n"
+                f"[{', '.join(safetensors_model_filenames - safetensors_variant_filenames)}\nIf this behavior is not "
+                f"expected, please check your folder structure."
+            )
+
+    else:
+        ignore_patterns = ["*.safetensors", "*.msgpack"]
+
+        use_onnx = use_onnx if use_onnx is not None else is_onnx
+        if not use_onnx:
+            ignore_patterns += ["*.onnx", "*.pb"]
+
+        bin_variant_filenames = {f for f in variant_filenames if f.endswith(".bin")}
+        bin_model_filenames = {f for f in model_filenames if f.endswith(".bin")}
+        if len(bin_variant_filenames) > 0 and bin_model_filenames != bin_variant_filenames:
+            logger.warning(
+                f"\nA mixture of {variant} and non-{variant} filenames will be loaded.\nLoaded {variant} filenames:\n"
+                f"[{', '.join(bin_variant_filenames)}]\nLoaded non-{variant} filenames:\n"
+                f"[{', '.join(bin_model_filenames - bin_variant_filenames)}\nIf this behavior is not expected, please check "
+                f"your folder structure."
+            )
+
+    return ignore_patterns

src/diffusers/pipelines/pipeline_utils.py

@@ -71,15 +71,16 @@ from .pipeline_loading_utils import (
     CUSTOM_PIPELINE_FILE_NAME,
     LOADABLE_CLASSES,
     _fetch_class_library_tuple,
+    _get_custom_components_and_folders,
     _get_custom_pipeline_class,
     _get_final_device_map,
+    _get_ignore_patterns,
     _get_pipeline_class,
     _identify_model_variants,
     _maybe_raise_warning_for_inpainting,
     _resolve_custom_pipeline_and_cls,
     _unwrap_model,
     _update_init_kwargs_with_connected_pipeline,
-    is_safetensors_compatible,
     load_sub_model,
     maybe_raise_or_warn,
     variant_compatible_siblings,
@@ -1298,44 +1299,18 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
             config_dict = cls._dict_from_json_file(config_file)
             ignore_filenames = config_dict.pop("_ignore_files", [])
 
-            # retrieve all folder_names that contain relevant files
-            folder_names = [k for k, v in config_dict.items() if isinstance(v, list) and k != "_class_name"]
-
-            diffusers_module = importlib.import_module(__name__.split(".")[0])
-            pipelines = getattr(diffusers_module, "pipelines")
-
-            # optionally create a custom component <> custom file mapping
-            custom_components = {}
-            for component in folder_names:
-                module_candidate = config_dict[component][0]
-
-                if module_candidate is None or not isinstance(module_candidate, str):
-                    continue
-
-                # We compute candidate file path on the Hub. Do not use `os.path.join`.
-                candidate_file = f"{component}/{module_candidate}.py"
-
-                if candidate_file in filenames:
-                    custom_components[component] = module_candidate
-                elif module_candidate not in LOADABLE_CLASSES and not hasattr(pipelines, module_candidate):
-                    raise ValueError(
-                        f"{candidate_file} as defined in `model_index.json` does not exist in {pretrained_model_name} and is not a module in 'diffusers/pipelines'."
-                    )
-
-            if len(variant_filenames) == 0 and variant is not None:
-                error_message = f"You are trying to load the model files of the `variant={variant}`, but no such modeling files are available."
-                raise ValueError(error_message)
-
             # remove ignored filenames
             model_filenames = set(model_filenames) - set(ignore_filenames)
             variant_filenames = set(variant_filenames) - set(ignore_filenames)
 
-            # if the whole pipeline is cached we don't have to ping the Hub
             if revision in DEPRECATED_REVISION_ARGS and version.parse(
                 version.parse(__version__).base_version
             ) >= version.parse("0.22.0"):
                 warn_deprecated_model_variant(pretrained_model_name, token, variant, revision, model_filenames)
 
+            custom_components, folder_names = _get_custom_components_and_folders(
+                pretrained_model_name, config_dict, filenames, variant_filenames, variant
+            )
             model_folder_names = {os.path.split(f)[0] for f in model_filenames if os.path.split(f)[0] in folder_names}
 
             custom_class_name = None
@@ -1395,48 +1370,18 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
             expected_components, _ = cls._get_signature_keys(pipeline_class)
             passed_components = [k for k in expected_components if k in kwargs]
 
-            if (
-                use_safetensors
-                and not allow_pickle
-                and not is_safetensors_compatible(
-                    model_filenames, passed_components=passed_components, folder_names=model_folder_names
-                )
-            ):
-                raise EnvironmentError(
-                    f"Could not find the necessary `safetensors` weights in {model_filenames} (variant={variant})"
-                )
-            if from_flax:
-                ignore_patterns = ["*.bin", "*.safetensors", "*.onnx", "*.pb"]
-            elif use_safetensors and is_safetensors_compatible(
-                model_filenames, passed_components=passed_components, folder_names=model_folder_names
-            ):
-                ignore_patterns = ["*.bin", "*.msgpack"]
-
-                use_onnx = use_onnx if use_onnx is not None else pipeline_class._is_onnx
-                if not use_onnx:
-                    ignore_patterns += ["*.onnx", "*.pb"]
-
-                safetensors_variant_filenames = {f for f in variant_filenames if f.endswith(".safetensors")}
-                safetensors_model_filenames = {f for f in model_filenames if f.endswith(".safetensors")}
-                if (
-                    len(safetensors_variant_filenames) > 0
-                    and safetensors_model_filenames != safetensors_variant_filenames
-                ):
-                    logger.warning(
-                        f"\nA mixture of {variant} and non-{variant} filenames will be loaded.\nLoaded {variant} filenames:\n[{', '.join(safetensors_variant_filenames)}]\nLoaded non-{variant} filenames:\n[{', '.join(safetensors_model_filenames - safetensors_variant_filenames)}\nIf this behavior is not expected, please check your folder structure."
-                    )
-            else:
-                ignore_patterns = ["*.safetensors", "*.msgpack"]
-
-                use_onnx = use_onnx if use_onnx is not None else pipeline_class._is_onnx
-                if not use_onnx:
-                    ignore_patterns += ["*.onnx", "*.pb"]
-
-                bin_variant_filenames = {f for f in variant_filenames if f.endswith(".bin")}
-                bin_model_filenames = {f for f in model_filenames if f.endswith(".bin")}
-                if len(bin_variant_filenames) > 0 and bin_model_filenames != bin_variant_filenames:
-                    logger.warning(
-                        f"\nA mixture of {variant} and non-{variant} filenames will be loaded.\nLoaded {variant} filenames:\n[{', '.join(bin_variant_filenames)}]\nLoaded non-{variant} filenames:\n[{', '.join(bin_model_filenames - bin_variant_filenames)}\nIf this behavior is not expected, please check your folder structure."
+            # retrieve all patterns that should not be downloaded and error out when needed
+            ignore_patterns = _get_ignore_patterns(
+                passed_components,
+                model_folder_names,
+                model_filenames,
+                variant_filenames,
+                use_safetensors,
+                from_flax,
+                allow_pickle,
+                use_onnx,
+                pipeline_class._is_onnx,
+                variant,
             )
 
             # Don't download any objects that are passed

tests/pipelines/test_pipeline_utils.py

@@ -18,7 +18,7 @@ from diffusers import (
     StableDiffusionPipeline,
     UNet2DConditionModel,
 )
-from diffusers.pipelines.pipeline_utils import is_safetensors_compatible
+from diffusers.pipelines.pipeline_loading_utils import is_safetensors_compatible
 from diffusers.utils.testing_utils import torch_device