port tests for rgb_to_grayscale functional and transforms (#7967)

test/test_transforms_v2.py

@@ -116,11 +116,9 @@ class TestSmoke:
             (transforms.RandAugment(), auto_augment_adapter),
             (transforms.TrivialAugmentWide(), auto_augment_adapter),
             (transforms.ColorJitter(brightness=0.1, contrast=0.2, saturation=0.3, hue=0.15), None),
-            (transforms.Grayscale(), None),
             (transforms.RandomAdjustSharpness(sharpness_factor=0.5, p=1.0), None),
             (transforms.RandomAutocontrast(p=1.0), None),
             (transforms.RandomEqualize(p=1.0), None),
-            (transforms.RandomGrayscale(p=1.0), None),
             (transforms.RandomInvert(p=1.0), None),
             (transforms.RandomChannelPermutation(), None),
             (transforms.RandomPhotometricDistort(p=1.0), None),

test/test_transforms_v2_consistency.py

@@ -122,17 +122,6 @@ CONSISTENCY_CONFIGS = [
             (torch.float32, torch.float64),
         ]
     ],
-    ConsistencyConfig(
-        v2_transforms.Grayscale,
-        legacy_transforms.Grayscale,
-        [
-            ArgsKwargs(num_output_channels=1),
-            ArgsKwargs(num_output_channels=3),
-        ],
-        make_images_kwargs=dict(DEFAULT_MAKE_IMAGES_KWARGS, color_spaces=["RGB", "GRAY"]),
-        # Use default tolerances of `torch.testing.assert_close`
-        closeness_kwargs=dict(rtol=None, atol=None),
-    ),
     ConsistencyConfig(
         v2_transforms.ToPILImage,
         legacy_transforms.ToPILImage,
@@ -217,17 +206,6 @@ CONSISTENCY_CONFIGS = [
         ],
         closeness_kwargs={"atol": 1e-6, "rtol": 1e-6},
     ),
-    ConsistencyConfig(
-        v2_transforms.RandomGrayscale,
-        legacy_transforms.RandomGrayscale,
-        [
-            ArgsKwargs(p=0),
-            ArgsKwargs(p=1),
-        ],
-        make_images_kwargs=dict(DEFAULT_MAKE_IMAGES_KWARGS, color_spaces=["RGB", "GRAY"]),
-        # Use default tolerances of `torch.testing.assert_close`
-        closeness_kwargs=dict(rtol=None, atol=None),
-    ),
     ConsistencyConfig(
         v2_transforms.PILToTensor,
         legacy_transforms.PILToTensor,

test/test_transforms_v2_refactored.py

@@ -3945,3 +3945,58 @@ class TestColorJitter:
 
         mae = (actual.float() - expected.float()).abs().mean()
         assert mae < 2
+
+
+class TestRgbToGrayscale:
+    @pytest.mark.parametrize("dtype", [torch.uint8, torch.float32])
+    @pytest.mark.parametrize("device", cpu_and_cuda())
+    def test_kernel_image(self, dtype, device):
+        check_kernel(F.rgb_to_grayscale_image, make_image(dtype=dtype, device=device))
+
+    @pytest.mark.parametrize("make_input", [make_image_tensor, make_image_pil, make_image])
+    def test_functional(self, make_input):
+        check_functional(F.rgb_to_grayscale, make_input())
+
+    @pytest.mark.parametrize(
+        ("kernel", "input_type"),
+        [
+            (F.rgb_to_grayscale_image, torch.Tensor),
+            (F._rgb_to_grayscale_image_pil, PIL.Image.Image),
+            (F.rgb_to_grayscale_image, tv_tensors.Image),
+        ],
+    )
+    def test_functional_signature(self, kernel, input_type):
+        check_functional_kernel_signature_match(F.rgb_to_grayscale, kernel=kernel, input_type=input_type)
+
+    @pytest.mark.parametrize("transform", [transforms.Grayscale(), transforms.RandomGrayscale(p=1)])
+    @pytest.mark.parametrize("make_input", [make_image_tensor, make_image_pil, make_image])
+    def test_transform(self, transform, make_input):
+        check_transform(transform, make_input())
+
+    @pytest.mark.parametrize("num_output_channels", [1, 3])
+    @pytest.mark.parametrize("fn", [F.rgb_to_grayscale, transform_cls_to_functional(transforms.Grayscale)])
+    def test_image_correctness(self, num_output_channels, fn):
+        image = make_image(dtype=torch.uint8, device="cpu")
+
+        actual = fn(image, num_output_channels=num_output_channels)
+        expected = F.to_image(F.rgb_to_grayscale(F.to_pil_image(image), num_output_channels=num_output_channels))
+
+        assert_equal(actual, expected, rtol=0, atol=1)
+
+    @pytest.mark.parametrize("num_input_channels", [1, 3])
+    def test_random_transform_correctness(self, num_input_channels):
+        image = make_image(
+            color_space={
+                1: "GRAY",
+                3: "RGB",
+            }[num_input_channels],
+            dtype=torch.uint8,
+            device="cpu",
+        )
+
+        transform = transforms.RandomGrayscale(p=1)
+
+        actual = transform(image)
+        expected = F.to_image(F.rgb_to_grayscale(F.to_pil_image(image), num_output_channels=num_input_channels))
+
+        assert_equal(actual, expected, rtol=0, atol=1)