refactor flux2 klein kv pipeline tests to the new mixin structure

tests/pipelines/flux2/test_pipeline_flux2_klein_kv.py

@@ -1,6 +1,4 @@
-import unittest
-
-import numpy as np
+import pytest
 import torch
 from PIL import Image
 from transformers import Qwen2TokenizerFast, Qwen3Config, Qwen3ForCausalLM
@@ -12,18 +10,19 @@
     Flux2Transformer2DModel,
 )
 
-from ...testing_utils import torch_device
-from ..test_pipelines_common import PipelineTesterMixin, check_qkv_fused_layers_exist
+from ...testing_utils import assert_tensors_close, torch_device
+from ..testing_utils import (
+    BasePipelineTesterConfig,
+    MemoryTesterMixin,
+    PipelineTesterMixin,
+    check_qkv_fused_layers_exist,
+)
 
 
-class Flux2KleinKVPipelineFastTests(PipelineTesterMixin, unittest.TestCase):
+class Flux2KleinKVPipelineTesterConfig(BasePipelineTesterConfig):
     pipeline_class = Flux2KleinKVPipeline
-    params = frozenset(["prompt", "height", "width", "prompt_embeds", "image"])
-    batch_params = frozenset(["prompt"])
-
-    test_xformers_attention = False
-    test_layerwise_casting = True
-    test_group_offloading = True
+    required_input_params_in_call_signature = frozenset(["prompt", "height", "width", "prompt_embeds", "image"])
+    batch_input_params = frozenset(["prompt"])
 
     def get_dummy_components(self, num_layers: int = 1, num_single_layers: int = 1):
         torch.manual_seed(0)
@@ -83,67 +82,70 @@ def get_dummy_components(self, num_layers: int = 1, num_single_layers: int = 1):
             "vae": vae,
         }
 
-    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)
-
+    def get_dummy_inputs(self):
         inputs = {
             "prompt": "a dog is dancing",
             "image": Image.new("RGB", (64, 64)),
-            "generator": generator,
+            "generator": self.get_generator(0),
             "num_inference_steps": 2,
             "height": 8,
             "width": 8,
             "max_sequence_length": 64,
-            "output_type": "np",
             "text_encoder_out_layers": (1,),
+            # Request torch outputs so tests compare torch tensors directly (see `BasePipelineTesterConfig`).
+            "output_type": "pt",
         }
         return inputs
 
+
+class TestFlux2KleinKVPipeline(Flux2KleinKVPipelineTesterConfig, PipelineTesterMixin):
     def test_fused_qkv_projections(self):
-        device = "cpu"  # ensure determinism for the device-dependent torch.Generator
-        components = self.get_dummy_components()
-        pipe = self.pipeline_class(**components)
-        pipe = pipe.to(device)
-        pipe.set_progress_bar_config(disable=None)
+        # Run on CPU to keep the slice comparisons deterministic.
+        pipe = self.get_pipeline()
 
-        inputs = self.get_dummy_inputs(device)
+        inputs = self.get_dummy_inputs()
         image = pipe(**inputs).images
-        original_image_slice = image[0, -3:, -3:, -1]
+        original_image_slice = image[0, -1, -3:, -3:]
 
         pipe.transformer.fuse_qkv_projections()
-        self.assertTrue(
-            check_qkv_fused_layers_exist(pipe.transformer, ["to_qkv"]),
-            ("Something wrong with the fused attention layers. Expected all the attention projections to be fused."),
+        assert check_qkv_fused_layers_exist(pipe.transformer, ["to_qkv"]), (
+            "Something wrong with the fused attention layers. Expected all the attention projections to be fused."
         )
 
-        inputs = self.get_dummy_inputs(device)
+        inputs = self.get_dummy_inputs()
         image = pipe(**inputs).images
-        image_slice_fused = image[0, -3:, -3:, -1]
+        image_slice_fused = image[0, -1, -3:, -3:]
 
         pipe.transformer.unfuse_qkv_projections()
-        inputs = self.get_dummy_inputs(device)
+        inputs = self.get_dummy_inputs()
         image = pipe(**inputs).images
-        image_slice_disabled = image[0, -3:, -3:, -1]
-
-        self.assertTrue(
-            np.allclose(original_image_slice, image_slice_fused, atol=1e-3, rtol=1e-3),
-            ("Fusion of QKV projections shouldn't affect the outputs."),
+        image_slice_disabled = image[0, -1, -3:, -3:]
+
+        assert_tensors_close(
+            original_image_slice,
+            image_slice_fused,
+            atol=1e-3,
+            rtol=1e-3,
+            msg="Fusion of QKV projections shouldn't affect the outputs.",
         )
-        self.assertTrue(
-            np.allclose(image_slice_fused, image_slice_disabled, atol=1e-3, rtol=1e-3),
-            ("Outputs, with QKV projection fusion enabled, shouldn't change when fused QKV projections are disabled."),
+        assert_tensors_close(
+            image_slice_fused,
+            image_slice_disabled,
+            atol=1e-3,
+            rtol=1e-3,
+            msg="Outputs, with QKV projection fusion enabled, shouldn't change when fused QKV projections are disabled.",
         )
-        self.assertTrue(
-            np.allclose(original_image_slice, image_slice_disabled, atol=1e-2, rtol=1e-2),
-            ("Original outputs should match when fused QKV projections are disabled."),
+        assert_tensors_close(
+            original_image_slice,
+            image_slice_disabled,
+            atol=1e-2,
+            rtol=1e-2,
+            msg="Original outputs should match when fused QKV projections are disabled.",
         )
 
     def test_image_output_shape(self):
-        pipe = self.pipeline_class(**self.get_dummy_components()).to(torch_device)
-        inputs = self.get_dummy_inputs(torch_device)
+        pipe = self.get_pipeline().to(torch_device)
+        inputs = self.get_dummy_inputs()
 
         height_width_pairs = [(32, 32), (72, 57)]
         for height, width in height_width_pairs:
@@ -152,21 +154,22 @@ def test_image_output_shape(self):
 
             inputs.update({"height": height, "width": width})
             image = pipe(**inputs).images[0]
-            output_height, output_width, _ = image.shape
-            self.assertEqual(
-                (output_height, output_width),
-                (expected_height, expected_width),
-                f"Output shape {image.shape} does not match expected shape {(expected_height, expected_width)}",
+            _, output_height, output_width = image.shape
+            assert (output_height, output_width) == (expected_height, expected_width), (
+                f"Output shape {image.shape} does not match expected shape {(expected_height, expected_width)}"
             )
 
     def test_without_image(self):
-        device = "cpu"
-        pipe = self.pipeline_class(**self.get_dummy_components()).to(device)
-        inputs = self.get_dummy_inputs(device)
+        pipe = self.get_pipeline().to(torch_device)
+        inputs = self.get_dummy_inputs()
         del inputs["image"]
         image = pipe(**inputs).images
-        self.assertEqual(image.shape, (1, 8, 8, 3))
+        assert image.shape == (1, 3, 8, 8)
 
-    @unittest.skip("Needs to be revisited")
+    @pytest.mark.skip("Needs to be revisited")
     def test_encode_prompt_works_in_isolation(self):
         pass
+
+
+class TestFlux2KleinKVPipelineMemory(Flux2KleinKVPipelineTesterConfig, MemoryTesterMixin):
+    """Memory optimization tests (CPU offload, group offload, layerwise casting) for the Flux2 Klein KV pipeline."""