add tests

src/diffusers/pipelines/flux/pipeline_flux_kontext.py

@@ -740,6 +740,7 @@ class FluxKontextPipeline(
         callback_on_step_end_tensor_inputs: List[str] = ["latents"],
         max_sequence_length: int = 512,
         max_area: int = 1024**2,
+        _auto_resize: bool = True,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -937,13 +938,16 @@ class FluxKontextPipeline(
 
         # 3. Preprocess image
         if not torch.is_tensor(image) or image.size(1) == self.latent_channels:
-            image_width, image_height = self.image_processor.get_default_height_width(image)
+            if isinstance(image, list):
+                image_width, image_height = self.image_processor.get_default_height_width(image[0])
+            else:
+                image_width, image_height = self.image_processor.get_default_height_width(image)
             aspect_ratio = image_width / image_height
-
-            # Kontext is trained on specific resolutions, using one of them is recommended
-            _, image_width, image_height = min(
-                (abs(aspect_ratio - w / h), w, h) for w, h in PREFERRED_KONTEXT_RESOLUTIONS
-            )
+            if _auto_resize:
+                # Kontext is trained on specific resolutions, using one of them is recommended
+                _, image_width, image_height = min(
+                    (abs(aspect_ratio - w / h), w, h) for w, h in PREFERRED_KONTEXT_RESOLUTIONS
+                )
             image_width = image_width // multiple_of * multiple_of
             image_height = image_height // multiple_of * multiple_of
             image = self.image_processor.resize(image, image_height, image_width)

tests/pipelines/flux/test_pipeline_flux_kontext.py

@@ -0,0 +1,177 @@
+import unittest
+
+import numpy as np
+import PIL.Image
+import torch
+from transformers import AutoTokenizer, CLIPTextConfig, CLIPTextModel, CLIPTokenizer, T5EncoderModel
+
+from diffusers import (
+    AutoencoderKL,
+    FasterCacheConfig,
+    FlowMatchEulerDiscreteScheduler,
+    FluxKontextPipeline,
+    FluxTransformer2DModel,
+)
+from diffusers.utils.testing_utils import torch_device
+
+from ..test_pipelines_common import (
+    FasterCacheTesterMixin,
+    FluxIPAdapterTesterMixin,
+    PipelineTesterMixin,
+    PyramidAttentionBroadcastTesterMixin,
+)
+
+
+class FluxKontextPipelineFastTests(
+    unittest.TestCase,
+    PipelineTesterMixin,
+    FluxIPAdapterTesterMixin,
+    PyramidAttentionBroadcastTesterMixin,
+    FasterCacheTesterMixin,
+):
+    pipeline_class = FluxKontextPipeline
+    params = frozenset(
+        ["image", "prompt", "height", "width", "guidance_scale", "prompt_embeds", "pooled_prompt_embeds"]
+    )
+    batch_params = frozenset(["image", "prompt"])
+
+    # there is no xformers processor for Flux
+    test_xformers_attention = False
+    test_layerwise_casting = True
+    test_group_offloading = True
+
+    faster_cache_config = FasterCacheConfig(
+        spatial_attention_block_skip_range=2,
+        spatial_attention_timestep_skip_range=(-1, 901),
+        unconditional_batch_skip_range=2,
+        attention_weight_callback=lambda _: 0.5,
+        is_guidance_distilled=True,
+    )
+
+    def get_dummy_components(self, num_layers: int = 1, num_single_layers: int = 1):
+        torch.manual_seed(0)
+        transformer = FluxTransformer2DModel(
+            patch_size=1,
+            in_channels=4,
+            num_layers=num_layers,
+            num_single_layers=num_single_layers,
+            attention_head_dim=16,
+            num_attention_heads=2,
+            joint_attention_dim=32,
+            pooled_projection_dim=32,
+            axes_dims_rope=[4, 4, 8],
+        )
+        clip_text_encoder_config = CLIPTextConfig(
+            bos_token_id=0,
+            eos_token_id=2,
+            hidden_size=32,
+            intermediate_size=37,
+            layer_norm_eps=1e-05,
+            num_attention_heads=4,
+            num_hidden_layers=5,
+            pad_token_id=1,
+            vocab_size=1000,
+            hidden_act="gelu",
+            projection_dim=32,
+        )
+
+        torch.manual_seed(0)
+        text_encoder = CLIPTextModel(clip_text_encoder_config)
+
+        torch.manual_seed(0)
+        text_encoder_2 = T5EncoderModel.from_pretrained("hf-internal-testing/tiny-random-t5")
+
+        tokenizer = CLIPTokenizer.from_pretrained("hf-internal-testing/tiny-random-clip")
+        tokenizer_2 = AutoTokenizer.from_pretrained("hf-internal-testing/tiny-random-t5")
+
+        torch.manual_seed(0)
+        vae = AutoencoderKL(
+            sample_size=32,
+            in_channels=3,
+            out_channels=3,
+            block_out_channels=(4,),
+            layers_per_block=1,
+            latent_channels=1,
+            norm_num_groups=1,
+            use_quant_conv=False,
+            use_post_quant_conv=False,
+            shift_factor=0.0609,
+            scaling_factor=1.5035,
+        )
+
+        scheduler = FlowMatchEulerDiscreteScheduler()
+
+        return {
+            "scheduler": scheduler,
+            "text_encoder": text_encoder,
+            "text_encoder_2": text_encoder_2,
+            "tokenizer": tokenizer,
+            "tokenizer_2": tokenizer_2,
+            "transformer": transformer,
+            "vae": vae,
+            "image_encoder": None,
+            "feature_extractor": None,
+        }
+
+    def get_dummy_inputs(self, device, seed=0):
+        if str(device).startswith("mps"):
+            generator = torch.manual_seed(seed)
+        else:
+            generator = torch.Generator(device="cpu").manual_seed(seed)
+
+        image = PIL.Image.new("RGB", (32, 32), 0)
+        inputs = {
+            "image": image,
+            "prompt": "A painting of a squirrel eating a burger",
+            "generator": generator,
+            "num_inference_steps": 2,
+            "guidance_scale": 5.0,
+            "height": 8,
+            "width": 8,
+            "max_area": 8 * 8,
+            "max_sequence_length": 48,
+            "output_type": "np",
+            "_auto_resize": False,
+        }
+        return inputs
+
+    def test_flux_different_prompts(self):
+        pipe = self.pipeline_class(**self.get_dummy_components()).to(torch_device)
+
+        inputs = self.get_dummy_inputs(torch_device)
+        output_same_prompt = pipe(**inputs).images[0]
+
+        inputs = self.get_dummy_inputs(torch_device)
+        inputs["prompt_2"] = "a different prompt"
+        output_different_prompts = pipe(**inputs).images[0]
+
+        max_diff = np.abs(output_same_prompt - output_different_prompts).max()
+
+        # Outputs should be different here
+        # For some reasons, they don't show large differences
+        assert max_diff > 1e-6
+
+    def test_flux_image_output_shape(self):
+        pipe = self.pipeline_class(**self.get_dummy_components()).to(torch_device)
+        inputs = self.get_dummy_inputs(torch_device)
+
+        height_width_pairs = [(32, 32), (72, 57)]
+        for height, width in height_width_pairs:
+            expected_height = height - height % (pipe.vae_scale_factor * 2)
+            expected_width = width - width % (pipe.vae_scale_factor * 2)
+
+            inputs.update({"height": height, "width": width, "max_area": height * width})
+            image = pipe(**inputs).images[0]
+            output_height, output_width, _ = image.shape
+            assert (output_height, output_width) == (expected_height, expected_width)
+
+    def test_flux_true_cfg(self):
+        pipe = self.pipeline_class(**self.get_dummy_components()).to(torch_device)
+        inputs = self.get_dummy_inputs(torch_device)
+        inputs.pop("generator")
+
+        no_true_cfg_out = pipe(**inputs, generator=torch.manual_seed(0)).images[0]
+        inputs["negative_prompt"] = "bad quality"
+        inputs["true_cfg_scale"] = 2.0
+        true_cfg_out = pipe(**inputs, generator=torch.manual_seed(0)).images[0]
+        assert not np.allclose(no_true_cfg_out, true_cfg_out)