fix a bug in `from_pretrained` when load optional components (#4745)

* fix
---------
Co-authored-by: yiyixuxu <yixu310@gmail,com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

src/diffusers/pipelines/pipeline_utils.py

@@ -1012,8 +1012,12 @@ class DiffusionPipeline(ConfigMixin, PushToHubMixin):
 
         init_dict, unused_kwargs, _ = pipeline_class.extract_init_dict(config_dict, **kwargs)
 
-        # define init kwargs
-        init_kwargs = {k: init_dict.pop(k) for k in optional_kwargs if k in init_dict}
+        # define init kwargs and make sure that optional component modules are filtered out
+        init_kwargs = {
+            k: init_dict.pop(k)
+            for k in optional_kwargs
+            if k in init_dict and k not in pipeline_class._optional_components
+        }
         init_kwargs = {**init_kwargs, **passed_pipe_kwargs}
 
         # remove `null` components

tests/pipelines/stable_diffusion_2/test_stable_diffusion_upscale.py

@@ -15,6 +15,7 @@
 
 import gc
 import random
+import tempfile
 import unittest
 
 import numpy as np
@@ -315,6 +316,52 @@ class StableDiffusionUpscalePipelineFastTests(unittest.TestCase):
         expected_height_width = low_res_image.size[0] * 4
         assert image.shape == (1, expected_height_width, expected_height_width, 3)
 
+    def test_stable_diffusion_upscale_from_save_pretrained(self):
+        pipes = []
+
+        device = "cpu"  # ensure determinism for the device-dependent torch.Generator
+        low_res_scheduler = DDPMScheduler()
+        scheduler = DDIMScheduler(prediction_type="v_prediction")
+        tokenizer = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")
+
+        # make sure here that pndm scheduler skips prk
+        sd_pipe = StableDiffusionUpscalePipeline(
+            unet=self.dummy_cond_unet_upscale,
+            low_res_scheduler=low_res_scheduler,
+            scheduler=scheduler,
+            vae=self.dummy_vae,
+            text_encoder=self.dummy_text_encoder,
+            tokenizer=tokenizer,
+            max_noise_level=350,
+        )
+        sd_pipe = sd_pipe.to(device)
+        pipes.append(sd_pipe)
+
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            sd_pipe.save_pretrained(tmpdirname)
+            sd_pipe = StableDiffusionUpscalePipeline.from_pretrained(tmpdirname).to(device)
+        pipes.append(sd_pipe)
+
+        prompt = "A painting of a squirrel eating a burger"
+        image = self.dummy_image.cpu().permute(0, 2, 3, 1)[0]
+        low_res_image = Image.fromarray(np.uint8(image)).convert("RGB").resize((64, 64))
+
+        image_slices = []
+        for pipe in pipes:
+            generator = torch.Generator(device=device).manual_seed(0)
+            image = pipe(
+                [prompt],
+                image=low_res_image,
+                generator=generator,
+                guidance_scale=6.0,
+                noise_level=20,
+                num_inference_steps=2,
+                output_type="np",
+            ).images
+            image_slices.append(image[0, -3:, -3:, -1].flatten())
+
+        assert np.abs(image_slices[0] - image_slices[1]).max() < 1e-3
+
 
 @slow
 @require_torch_gpu

tests/pipelines/stable_diffusion_xl/test_stable_diffusion_xl.py

@@ -14,6 +14,7 @@
 # limitations under the License.
 
 import copy
+import tempfile
 import unittest
 
 import numpy as np
@@ -689,3 +690,25 @@ class StableDiffusionXLPipelineFastTests(PipelineLatentTesterMixin, PipelineTest
 
         # ensure the results are not equal
         assert np.abs(image_slice_1.flatten() - image_slice_3.flatten()).max() > 1e-4
+
+    def test_stable_diffusion_xl_save_from_pretrained(self):
+        pipes = []
+        components = self.get_dummy_components()
+        sd_pipe = StableDiffusionXLPipeline(**components).to(torch_device)
+        pipes.append(sd_pipe)
+
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            sd_pipe.save_pretrained(tmpdirname)
+            sd_pipe = StableDiffusionXLPipeline.from_pretrained(tmpdirname).to(torch_device)
+        pipes.append(sd_pipe)
+
+        image_slices = []
+        for pipe in pipes:
+            pipe.unet.set_default_attn_processor()
+
+            inputs = self.get_dummy_inputs(torch_device)
+            image = pipe(**inputs).images
+
+            image_slices.append(image[0, -3:, -3:, -1].flatten())
+
+        assert np.abs(image_slices[0] - image_slices[1]).max() < 1e-3