add multi adapter support to StableDiffusionXLAdapterPipeline (#5127)

fix and add tests
Co-authored-by: yiyixuxu <yixu310@gmail,com>

src/diffusers/pipelines/t2i_adapter/pipeline_stable_diffusion_xl_adapter.py

@@ -787,8 +787,16 @@ class StableDiffusionXLAdapterPipeline(
         height, width = self._default_height_width(height, width, image)
         device = self._execution_device
 
-        adapter_input = _preprocess_adapter_image(image, height, width).to(device)
+        if isinstance(self.adapter, MultiAdapter):
+            adapter_input = []
 
+            for one_image in image:
+                one_image = _preprocess_adapter_image(one_image, height, width)
+                one_image = one_image.to(device=device, dtype=self.adapter.dtype)
+                adapter_input.append(one_image)
+        else:
+            adapter_input = _preprocess_adapter_image(image, height, width)
+            adapter_input = adapter_input.to(device=device, dtype=self.adapter.dtype)
         original_size = original_size or (height, width)
         target_size = target_size or (height, width)
 
@@ -865,7 +873,11 @@ class StableDiffusionXLAdapterPipeline(
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
         # 7. Prepare added time ids & embeddings & adapter features
-        adapter_input = adapter_input.type(latents.dtype)
+        if isinstance(self.adapter, MultiAdapter):
+            adapter_state = self.adapter(adapter_input, adapter_conditioning_scale)
+            for k, v in enumerate(adapter_state):
+                adapter_state[k] = v
+        else:
             adapter_state = self.adapter(adapter_input)
             for k, v in enumerate(adapter_state):
                 adapter_state[k] = v * adapter_conditioning_scale

tests/pipelines/stable_diffusion_xl/test_stable_diffusion_xl_adapter.py

@@ -20,17 +20,20 @@ import numpy as np
 import torch
 from transformers import CLIPTextConfig, CLIPTextModel, CLIPTextModelWithProjection, CLIPTokenizer
 
+import diffusers
 from diffusers import (
     AutoencoderKL,
     EulerDiscreteScheduler,
+    MultiAdapter,
     StableDiffusionXLAdapterPipeline,
     T2IAdapter,
     UNet2DConditionModel,
 )
-from diffusers.utils.testing_utils import enable_full_determinism, floats_tensor
+from diffusers.utils import logging
+from diffusers.utils.testing_utils import enable_full_determinism, floats_tensor, torch_device
 
 from ..pipeline_params import TEXT_GUIDED_IMAGE_VARIATION_BATCH_PARAMS, TEXT_GUIDED_IMAGE_VARIATION_PARAMS
-from ..test_pipelines_common import PipelineTesterMixin
+from ..test_pipelines_common import PipelineTesterMixin, assert_mean_pixel_difference
 
 
 enable_full_determinism()
@@ -41,7 +44,7 @@ class StableDiffusionXLAdapterPipelineFastTests(PipelineTesterMixin, unittest.Te
     params = TEXT_GUIDED_IMAGE_VARIATION_PARAMS
     batch_params = TEXT_GUIDED_IMAGE_VARIATION_BATCH_PARAMS
 
-    def get_dummy_components(self):
+    def get_dummy_components(self, adapter_type="full_adapter_xl"):
         torch.manual_seed(0)
         unet = UNet2DConditionModel(
             block_out_channels=(32, 64),
@@ -97,13 +100,38 @@ class StableDiffusionXLAdapterPipelineFastTests(PipelineTesterMixin, unittest.Te
 
         text_encoder_2 = CLIPTextModelWithProjection(text_encoder_config)
         tokenizer_2 = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")
+        if adapter_type == "full_adapter_xl":
             adapter = T2IAdapter(
+                in_channels=3,
+                channels=[32, 64],
+                num_res_blocks=2,
+                downscale_factor=4,
+                adapter_type=adapter_type,
+            )
+        elif adapter_type == "multi_adapter":
+            adapter = MultiAdapter(
+                [
+                    T2IAdapter(
+                        in_channels=3,
+                        channels=[32, 64],
+                        num_res_blocks=2,
+                        downscale_factor=4,
+                        adapter_type="full_adapter_xl",
+                    ),
+                    T2IAdapter(
                         in_channels=3,
                         channels=[32, 64],
                         num_res_blocks=2,
                         downscale_factor=4,
                         adapter_type="full_adapter_xl",
+                    ),
+                ]
             )
+        else:
+            raise ValueError(
+                f"Unknown adapter type: {adapter_type}, must be one of 'full_adapter_xl', or 'multi_adapter''"
+            )
+
         components = {
             "adapter": adapter,
             "unet": unet,
@@ -118,8 +146,12 @@ class StableDiffusionXLAdapterPipelineFastTests(PipelineTesterMixin, unittest.Te
         }
         return components
 
-    def get_dummy_inputs(self, device, seed=0):
+    def get_dummy_inputs(self, device, seed=0, num_images=1):
+        if num_images == 1:
             image = floats_tensor((1, 3, 64, 64), rng=random.Random(seed)).to(device)
+        else:
+            image = [floats_tensor((1, 3, 64, 64), rng=random.Random(seed)).to(device) for _ in range(num_images)]
+
         if str(device).startswith("mps"):
             generator = torch.manual_seed(seed)
         else:
@@ -150,3 +182,202 @@ class StableDiffusionXLAdapterPipelineFastTests(PipelineTesterMixin, unittest.Te
             [0.5752919, 0.6022097, 0.4728038, 0.49861962, 0.57084894, 0.4644975, 0.5193715, 0.5133664, 0.4729858]
         )
         assert np.abs(image_slice.flatten() - expected_slice).max() < 5e-3
+
+
+class StableDiffusionXLMultiAdapterPipelineFastTests(
+    StableDiffusionXLAdapterPipelineFastTests, PipelineTesterMixin, unittest.TestCase
+):
+    def get_dummy_components(self):
+        return super().get_dummy_components("multi_adapter")
+
+    def get_dummy_inputs(self, device, seed=0):
+        inputs = super().get_dummy_inputs(device, seed, num_images=2)
+        inputs["adapter_conditioning_scale"] = [0.5, 0.5]
+        return inputs
+
+    def test_stable_diffusion_adapter_default_case(self):
+        device = "cpu"  # ensure determinism for the device-dependent torch.Generator
+        components = self.get_dummy_components()
+        sd_pipe = StableDiffusionXLAdapterPipeline(**components)
+        sd_pipe = sd_pipe.to(device)
+        sd_pipe.set_progress_bar_config(disable=None)
+
+        inputs = self.get_dummy_inputs(device)
+        image = sd_pipe(**inputs).images
+        image_slice = image[0, -3:, -3:, -1]
+
+        assert image.shape == (1, 64, 64, 3)
+        expected_slice = np.array(
+            [0.5813032, 0.60995954, 0.47563356, 0.5056669, 0.57199144, 0.4631841, 0.5176794, 0.51252556, 0.47183886]
+        )
+        assert np.abs(image_slice.flatten() - expected_slice).max() < 5e-3
+
+    def test_inference_batch_consistent(
+        self, batch_sizes=[2, 4, 13], additional_params_copy_to_batched_inputs=["num_inference_steps"]
+    ):
+        components = self.get_dummy_components()
+        pipe = self.pipeline_class(**components)
+        pipe.to(torch_device)
+        pipe.set_progress_bar_config(disable=None)
+
+        inputs = self.get_dummy_inputs(torch_device)
+
+        logger = logging.get_logger(pipe.__module__)
+        logger.setLevel(level=diffusers.logging.FATAL)
+
+        # batchify inputs
+        for batch_size in batch_sizes:
+            batched_inputs = {}
+            for name, value in inputs.items():
+                if name in self.batch_params:
+                    # prompt is string
+                    if name == "prompt":
+                        len_prompt = len(value)
+                        # make unequal batch sizes
+                        batched_inputs[name] = [value[: len_prompt // i] for i in range(1, batch_size + 1)]
+
+                        # make last batch super long
+                        batched_inputs[name][-1] = 100 * "very long"
+                    elif name == "image":
+                        batched_images = []
+
+                        for image in value:
+                            batched_images.append(batch_size * [image])
+
+                        batched_inputs[name] = batched_images
+                    else:
+                        batched_inputs[name] = batch_size * [value]
+
+                elif name == "batch_size":
+                    batched_inputs[name] = batch_size
+                else:
+                    batched_inputs[name] = value
+
+            for arg in additional_params_copy_to_batched_inputs:
+                batched_inputs[arg] = inputs[arg]
+
+            batched_inputs["output_type"] = "np"
+
+            output = pipe(**batched_inputs)
+
+            assert len(output[0]) == batch_size
+
+            batched_inputs["output_type"] = "np"
+
+            output = pipe(**batched_inputs)[0]
+
+            assert output.shape[0] == batch_size
+
+        logger.setLevel(level=diffusers.logging.WARNING)
+
+    def test_num_images_per_prompt(self):
+        components = self.get_dummy_components()
+        pipe = self.pipeline_class(**components)
+        pipe = pipe.to(torch_device)
+        pipe.set_progress_bar_config(disable=None)
+
+        batch_sizes = [1, 2]
+        num_images_per_prompts = [1, 2]
+
+        for batch_size in batch_sizes:
+            for num_images_per_prompt in num_images_per_prompts:
+                inputs = self.get_dummy_inputs(torch_device)
+
+                for key in inputs.keys():
+                    if key in self.batch_params:
+                        if key == "image":
+                            batched_images = []
+
+                            for image in inputs[key]:
+                                batched_images.append(batch_size * [image])
+
+                            inputs[key] = batched_images
+                        else:
+                            inputs[key] = batch_size * [inputs[key]]
+
+                images = pipe(**inputs, num_images_per_prompt=num_images_per_prompt)[0]
+
+                assert images.shape[0] == batch_size * num_images_per_prompt
+
+    def test_inference_batch_single_identical(
+        self,
+        batch_size=3,
+        test_max_difference=None,
+        test_mean_pixel_difference=None,
+        relax_max_difference=False,
+        expected_max_diff=2e-3,
+        additional_params_copy_to_batched_inputs=["num_inference_steps"],
+    ):
+        if test_max_difference is None:
+            # TODO(Pedro) - not sure why, but not at all reproducible at the moment it seems
+            # make sure that batched and non-batched is identical
+            test_max_difference = torch_device != "mps"
+
+        if test_mean_pixel_difference is None:
+            # TODO same as above
+            test_mean_pixel_difference = torch_device != "mps"
+
+        components = self.get_dummy_components()
+        pipe = self.pipeline_class(**components)
+        pipe.to(torch_device)
+        pipe.set_progress_bar_config(disable=None)
+
+        inputs = self.get_dummy_inputs(torch_device)
+
+        logger = logging.get_logger(pipe.__module__)
+        logger.setLevel(level=diffusers.logging.FATAL)
+
+        # batchify inputs
+        batched_inputs = {}
+        batch_size = batch_size
+        for name, value in inputs.items():
+            if name in self.batch_params:
+                # prompt is string
+                if name == "prompt":
+                    len_prompt = len(value)
+                    # make unequal batch sizes
+                    batched_inputs[name] = [value[: len_prompt // i] for i in range(1, batch_size + 1)]
+
+                    # make last batch super long
+                    batched_inputs[name][-1] = 100 * "very long"
+                elif name == "image":
+                    batched_images = []
+
+                    for image in value:
+                        batched_images.append(batch_size * [image])
+
+                    batched_inputs[name] = batched_images
+                else:
+                    batched_inputs[name] = batch_size * [value]
+            elif name == "batch_size":
+                batched_inputs[name] = batch_size
+            elif name == "generator":
+                batched_inputs[name] = [self.get_generator(i) for i in range(batch_size)]
+            else:
+                batched_inputs[name] = value
+
+        for arg in additional_params_copy_to_batched_inputs:
+            batched_inputs[arg] = inputs[arg]
+
+        output_batch = pipe(**batched_inputs)
+        assert output_batch[0].shape[0] == batch_size
+
+        inputs["generator"] = self.get_generator(0)
+
+        output = pipe(**inputs)
+
+        logger.setLevel(level=diffusers.logging.WARNING)
+        if test_max_difference:
+            if relax_max_difference:
+                # Taking the median of the largest <n> differences
+                # is resilient to outliers
+                diff = np.abs(output_batch[0][0] - output[0][0])
+                diff = diff.flatten()
+                diff.sort()
+                max_diff = np.median(diff[-5:])
+            else:
+                max_diff = np.abs(output_batch[0][0] - output[0][0]).max()
+            assert max_diff < expected_max_diff
+
+        if test_mean_pixel_difference:
+            assert_mean_pixel_difference(output_batch[0][0], output[0][0])