[Custom pipeline] Easier loading of local pipelines (#1327)

* [Custom pipeline] Easier loading of local pipelines

* upgrade black

src/diffusers/pipeline_utils.py

@@ -18,6 +18,7 @@
 import inspect
 import os
 from dataclasses import dataclass
+from pathlib import Path
 from typing import Any, Dict, List, Optional, Union
 
 import numpy as np
@@ -483,8 +484,16 @@ def from_pretrained(cls, pretrained_model_name_or_path: Optional[Union[str, os.P
         # 2. Load the pipeline class, if using custom module then load it from the hub
         # if we load from explicit class, let's use it
         if custom_pipeline is not None:
+            if custom_pipeline.endswith(".py"):
+                path = Path(custom_pipeline)
+                # decompose into folder & file
+                file_name = path.name
+                custom_pipeline = path.parent.absolute()
+            else:
+                file_name = CUSTOM_PIPELINE_FILE_NAME
+
             pipeline_class = get_class_from_dynamic_module(
-                custom_pipeline, module_file=CUSTOM_PIPELINE_FILE_NAME, cache_dir=custom_pipeline
+                custom_pipeline, module_file=file_name, cache_dir=custom_pipeline
             )
         elif cls != DiffusionPipeline:
             pipeline_class = cls

tests/fixtures/custom_pipeline/what_ever.py

@@ -0,0 +1,101 @@
+# Copyright 2022 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.
+
+
+from typing import Optional, Tuple, Union
+
+import torch
+
+from diffusers.pipeline_utils import DiffusionPipeline, ImagePipelineOutput
+
+
+class CustomLocalPipeline(DiffusionPipeline):
+    r"""
+    This model inherits from [`DiffusionPipeline`]. Check the superclass documentation for the generic methods the
+    library implements for all the pipelines (such as downloading or saving, running on a particular device, etc.)
+
+    Parameters:
+        unet ([`UNet2DModel`]): U-Net architecture to denoise the encoded image.
+        scheduler ([`SchedulerMixin`]):
+            A scheduler to be used in combination with `unet` to denoise the encoded image. Can be one of
+            [`DDPMScheduler`], or [`DDIMScheduler`].
+    """
+
+    def __init__(self, unet, scheduler):
+        super().__init__()
+        self.register_modules(unet=unet, scheduler=scheduler)
+
+    @torch.no_grad()
+    def __call__(
+        self,
+        batch_size: int = 1,
+        generator: Optional[torch.Generator] = None,
+        num_inference_steps: int = 50,
+        output_type: Optional[str] = "pil",
+        return_dict: bool = True,
+        **kwargs,
+    ) -> Union[ImagePipelineOutput, Tuple]:
+        r"""
+        Args:
+            batch_size (`int`, *optional*, defaults to 1):
+                The number of images to generate.
+            generator (`torch.Generator`, *optional*):
+                A [torch generator](https://pytorch.org/docs/stable/generated/torch.Generator.html) to make generation
+                deterministic.
+            eta (`float`, *optional*, defaults to 0.0):
+                The eta parameter which controls the scale of the variance (0 is DDIM and 1 is one type of DDPM).
+            num_inference_steps (`int`, *optional*, defaults to 50):
+                The number of denoising steps. More denoising steps usually lead to a higher quality image at the
+                expense of slower inference.
+            output_type (`str`, *optional*, defaults to `"pil"`):
+                The output format of the generate image. Choose between
+                [PIL](https://pillow.readthedocs.io/en/stable/): `PIL.Image.Image` or `np.array`.
+            return_dict (`bool`, *optional*, defaults to `True`):
+                Whether or not to return a [`~pipeline_utils.ImagePipelineOutput`] instead of a plain tuple.
+
+        Returns:
+            [`~pipeline_utils.ImagePipelineOutput`] or `tuple`: [`~pipelines.utils.ImagePipelineOutput`] if
+            `return_dict` is True, otherwise a `tuple. When returning a tuple, the first element is a list with the
+            generated images.
+        """
+
+        # Sample gaussian noise to begin loop
+        image = torch.randn(
+            (batch_size, self.unet.in_channels, self.unet.sample_size, self.unet.sample_size),
+            generator=generator,
+        )
+        image = image.to(self.device)
+
+        # set step values
+        self.scheduler.set_timesteps(num_inference_steps)
+
+        for t in self.progress_bar(self.scheduler.timesteps):
+            # 1. predict noise model_output
+            model_output = self.unet(image, t).sample
+
+            # 2. predict previous mean of image x_t-1 and add variance depending on eta
+            # eta corresponds to η in paper and should be between [0, 1]
+            # do x_t -> x_t-1
+            image = self.scheduler.step(model_output, t, image).prev_sample
+
+        image = (image / 2 + 0.5).clamp(0, 1)
+        image = image.cpu().permute(0, 2, 3, 1).numpy()
+        if output_type == "pil":
+            image = self.numpy_to_pil(image)
+
+        if not return_dict:
+            return (image,), "This is a local test"
+
+        return ImagePipelineOutput(images=image), "This is a local test"

tests/test_pipelines.py

@@ -192,7 +192,7 @@ def test_run_custom_pipeline(self):
         # compare output to https://huggingface.co/hf-internal-testing/diffusers-dummy-pipeline/blob/main/pipeline.py#L102
         assert output_str == "This is a test"
 
-    def test_local_custom_pipeline(self):
+    def test_local_custom_pipeline_repo(self):
         local_custom_pipeline_path = get_tests_dir("fixtures/custom_pipeline")
         pipeline = DiffusionPipeline.from_pretrained(
             "google/ddpm-cifar10-32", custom_pipeline=local_custom_pipeline_path
@@ -205,6 +205,20 @@ def test_local_custom_pipeline(self):
         # compare to https://github.com/huggingface/diffusers/blob/main/tests/fixtures/custom_pipeline/pipeline.py#L102
         assert output_str == "This is a local test"
 
+    def test_local_custom_pipeline_file(self):
+        local_custom_pipeline_path = get_tests_dir("fixtures/custom_pipeline")
+        local_custom_pipeline_path = os.path.join(local_custom_pipeline_path, "what_ever.py")
+        pipeline = DiffusionPipeline.from_pretrained(
+            "google/ddpm-cifar10-32", custom_pipeline=local_custom_pipeline_path
+        )
+        pipeline = pipeline.to(torch_device)
+        images, output_str = pipeline(num_inference_steps=2, output_type="np")
+
+        assert pipeline.__class__.__name__ == "CustomLocalPipeline"
+        assert images[0].shape == (1, 32, 32, 3)
+        # compare to https://github.com/huggingface/diffusers/blob/main/tests/fixtures/custom_pipeline/pipeline.py#L102
+        assert output_str == "This is a local test"
+
     @slow
     @require_torch_gpu
     def test_load_pipeline_from_git(self):