[lora] tests for `exclude_modules` with Wan VACE (#11843)

* wan vace.

* update

* update

* import problem

tests/lora/test_lora_layers_wanvace.py

+# Copyright 2025 HuggingFace Inc.
+#
+# 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.
+
+import os
+import sys
+import tempfile
+import unittest
+
+import numpy as np
+import pytest
+import safetensors.torch
+import torch
+from PIL import Image
+from transformers import AutoTokenizer, T5EncoderModel
+
+from diffusers import AutoencoderKLWan, FlowMatchEulerDiscreteScheduler, WanVACEPipeline, WanVACETransformer3DModel
+from diffusers.utils.import_utils import is_peft_available
+from diffusers.utils.testing_utils import (
+    floats_tensor,
+    require_peft_backend,
+    require_peft_version_greater,
+    skip_mps,
+    torch_device,
+)
+
+
+if is_peft_available():
+    from peft.utils import get_peft_model_state_dict
+
+sys.path.append(".")
+
+from utils import PeftLoraLoaderMixinTests  # noqa: E402
+
+
+@require_peft_backend
+@skip_mps
+class WanVACELoRATests(unittest.TestCase, PeftLoraLoaderMixinTests):
+    pipeline_class = WanVACEPipeline
+    scheduler_cls = FlowMatchEulerDiscreteScheduler
+    scheduler_classes = [FlowMatchEulerDiscreteScheduler]
+    scheduler_kwargs = {}
+
+    transformer_kwargs = {
+        "patch_size": (1, 2, 2),
+        "num_attention_heads": 2,
+        "attention_head_dim": 8,
+        "in_channels": 4,
+        "out_channels": 4,
+        "text_dim": 32,
+        "freq_dim": 16,
+        "ffn_dim": 16,
+        "num_layers": 2,
+        "cross_attn_norm": True,
+        "qk_norm": "rms_norm_across_heads",
+        "rope_max_seq_len": 16,
+        "vace_layers": [0],
+        "vace_in_channels": 72,
+    }
+    transformer_cls = WanVACETransformer3DModel
+    vae_kwargs = {
+        "base_dim": 3,
+        "z_dim": 4,
+        "dim_mult": [1, 1, 1, 1],
+        "latents_mean": torch.randn(4).numpy().tolist(),
+        "latents_std": torch.randn(4).numpy().tolist(),
+        "num_res_blocks": 1,
+        "temperal_downsample": [False, True, True],
+    }
+    vae_cls = AutoencoderKLWan
+    has_two_text_encoders = True
+    tokenizer_cls, tokenizer_id = AutoTokenizer, "hf-internal-testing/tiny-random-t5"
+    text_encoder_cls, text_encoder_id = T5EncoderModel, "hf-internal-testing/tiny-random-t5"
+
+    text_encoder_target_modules = ["q", "k", "v", "o"]
+
+    @property
+    def output_shape(self):
+        return (1, 9, 16, 16, 3)
+
+    def get_dummy_inputs(self, with_generator=True):
+        batch_size = 1
+        sequence_length = 16
+        num_channels = 4
+        num_frames = 9
+        num_latent_frames = 3  # (num_frames - 1) // temporal_compression_ratio + 1
+        sizes = (4, 4)
+        height, width = 16, 16
+
+        generator = torch.manual_seed(0)
+        noise = floats_tensor((batch_size, num_latent_frames, num_channels) + sizes)
+        input_ids = torch.randint(1, sequence_length, size=(batch_size, sequence_length), generator=generator)
+        video = [Image.new("RGB", (height, width))] * num_frames
+        mask = [Image.new("L", (height, width), 0)] * num_frames
+
+        pipeline_inputs = {
+            "video": video,
+            "mask": mask,
+            "prompt": "",
+            "num_frames": num_frames,
+            "num_inference_steps": 1,
+            "guidance_scale": 6.0,
+            "height": height,
+            "width": height,
+            "max_sequence_length": sequence_length,
+            "output_type": "np",
+        }
+        if with_generator:
+            pipeline_inputs.update({"generator": generator})
+
+        return noise, input_ids, pipeline_inputs
+
+    def test_simple_inference_with_text_lora_denoiser_fused_multi(self):
+        super().test_simple_inference_with_text_lora_denoiser_fused_multi(expected_atol=9e-3)
+
+    def test_simple_inference_with_text_denoiser_lora_unfused(self):
+        super().test_simple_inference_with_text_denoiser_lora_unfused(expected_atol=9e-3)
+
+    @unittest.skip("Not supported in Wan VACE.")
+    def test_simple_inference_with_text_denoiser_block_scale(self):
+        pass
+
+    @unittest.skip("Not supported in Wan VACE.")
+    def test_simple_inference_with_text_denoiser_block_scale_for_all_dict_options(self):
+        pass
+
+    @unittest.skip("Not supported in Wan VACE.")
+    def test_modify_padding_mode(self):
+        pass
+
+    @unittest.skip("Text encoder LoRA is not supported in Wan VACE.")
+    def test_simple_inference_with_partial_text_lora(self):
+        pass
+
+    @unittest.skip("Text encoder LoRA is not supported in Wan VACE.")
+    def test_simple_inference_with_text_lora(self):
+        pass
+
+    @unittest.skip("Text encoder LoRA is not supported in Wan VACE.")
+    def test_simple_inference_with_text_lora_and_scale(self):
+        pass
+
+    @unittest.skip("Text encoder LoRA is not supported in Wan VACE.")
+    def test_simple_inference_with_text_lora_fused(self):
+        pass
+
+    @unittest.skip("Text encoder LoRA is not supported in Wan VACE.")
+    def test_simple_inference_with_text_lora_save_load(self):
+        pass
+
+    @pytest.mark.xfail(
+        condition=True,
+        reason="RuntimeError: Input type (float) and bias type (c10::BFloat16) should be the same",
+        strict=True,
+    )
+    def test_layerwise_casting_inference_denoiser(self):
+        super().test_layerwise_casting_inference_denoiser()
+
+    @require_peft_version_greater("0.13.2")
+    def test_lora_exclude_modules_wanvace(self):
+        scheduler_cls = self.scheduler_classes[0]
+        exclude_module_name = "vace_blocks.0.proj_out"
+        components, text_lora_config, denoiser_lora_config = self.get_dummy_components(scheduler_cls)
+        pipe = self.pipeline_class(**components).to(torch_device)
+        _, _, inputs = self.get_dummy_inputs(with_generator=False)
+
+        output_no_lora = pipe(**inputs, generator=torch.manual_seed(0))[0]
+        self.assertTrue(output_no_lora.shape == self.output_shape)
+
+        # only supported for `denoiser` now
+        denoiser_lora_config.target_modules = ["proj_out"]
+        denoiser_lora_config.exclude_modules = [exclude_module_name]
+        pipe, _ = self.add_adapters_to_pipeline(
+            pipe, text_lora_config=text_lora_config, denoiser_lora_config=denoiser_lora_config
+        )
+        # The state dict shouldn't contain the modules to be excluded from LoRA.
+        state_dict_from_model = get_peft_model_state_dict(pipe.transformer, adapter_name="default")
+        self.assertTrue(not any(exclude_module_name in k for k in state_dict_from_model))
+        self.assertTrue(any("proj_out" in k for k in state_dict_from_model))
+        output_lora_exclude_modules = pipe(**inputs, generator=torch.manual_seed(0))[0]
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            modules_to_save = self._get_modules_to_save(pipe, has_denoiser=True)
+            lora_state_dicts = self._get_lora_state_dicts(modules_to_save)
+            self.pipeline_class.save_lora_weights(save_directory=tmpdir, **lora_state_dicts)
+            pipe.unload_lora_weights()
+
+            # Check in the loaded state dict.
+            loaded_state_dict = safetensors.torch.load_file(os.path.join(tmpdir, "pytorch_lora_weights.safetensors"))
+            self.assertTrue(not any(exclude_module_name in k for k in loaded_state_dict))
+            self.assertTrue(any("proj_out" in k for k in loaded_state_dict))
+
+            # Check in the state dict obtained after loading LoRA.
+            pipe.load_lora_weights(tmpdir)
+            state_dict_from_model = get_peft_model_state_dict(pipe.transformer, adapter_name="default_0")
+            self.assertTrue(not any(exclude_module_name in k for k in state_dict_from_model))
+            self.assertTrue(any("proj_out" in k for k in state_dict_from_model))
+
+            output_lora_pretrained = pipe(**inputs, generator=torch.manual_seed(0))[0]
+            self.assertTrue(
+                not np.allclose(output_no_lora, output_lora_exclude_modules, atol=1e-3, rtol=1e-3),
+                "LoRA should change outputs.",
+            )
+            self.assertTrue(
+                np.allclose(output_lora_exclude_modules, output_lora_pretrained, atol=1e-3, rtol=1e-3),
+                "Lora outputs should match.",
+            )