Fixed issues with dtype in geom functional transforms v2 (#7211)

Co-authored-by: Philip Meier <github.pmeier@posteo.de>

test/prototype_common_utils.py

@@ -304,7 +304,7 @@ def make_image_loaders(
         "RGBA",
     ),
     extra_dims=DEFAULT_EXTRA_DIMS,
-    dtypes=(torch.float32, torch.uint8),
+    dtypes=(torch.float32, torch.float64, torch.uint8),
     constant_alpha=True,
 ):
     for params in combinations_grid(size=sizes, color_space=color_spaces, extra_dims=extra_dims, dtype=dtypes):
@@ -426,7 +426,7 @@ def make_bounding_box_loaders(
     extra_dims=DEFAULT_EXTRA_DIMS,
     formats=tuple(datapoints.BoundingBoxFormat),
     spatial_size="random",
-    dtypes=(torch.float32, torch.int64),
+    dtypes=(torch.float32, torch.float64, torch.int64),
 ):
     for params in combinations_grid(extra_dims=extra_dims, format=formats, dtype=dtypes):
         yield make_bounding_box_loader(**params, spatial_size=spatial_size)
@@ -618,7 +618,7 @@ def make_video_loaders(
     ),
     num_frames=(1, 0, "random"),
     extra_dims=DEFAULT_EXTRA_DIMS,
-    dtypes=(torch.uint8,),
+    dtypes=(torch.uint8, torch.float32, torch.float64),
 ):
     for params in combinations_grid(
         size=sizes, color_space=color_spaces, num_frames=num_frames, extra_dims=extra_dims, dtype=dtypes

test/prototype_transforms_kernel_infos.py

@@ -109,6 +109,12 @@ def float32_vs_uint8_pixel_difference(atol=1, mae=False):
     }
 
 
+def scripted_vs_eager_double_pixel_difference(device, atol=1e-6, rtol=1e-6):
+    return {
+        (("TestKernels", "test_scripted_vs_eager"), torch.float64, device): {"atol": atol, "rtol": rtol, "mae": False},
+    }
+
+
 def pil_reference_wrapper(pil_kernel):
     @functools.wraps(pil_kernel)
     def wrapper(input_tensor, *other_args, **kwargs):
@@ -541,8 +547,10 @@ def reference_affine_bounding_box_helper(bounding_box, *, format, affine_matrix)
     def transform(bbox, affine_matrix_, format_):
         # Go to float before converting to prevent precision loss in case of CXCYWH -> XYXY and W or H is 1
         in_dtype = bbox.dtype
+        if not torch.is_floating_point(bbox):
+            bbox = bbox.float()
         bbox_xyxy = F.convert_format_bounding_box(
-            bbox.float(), old_format=format_, new_format=datapoints.BoundingBoxFormat.XYXY, inplace=True
+            bbox, old_format=format_, new_format=datapoints.BoundingBoxFormat.XYXY, inplace=True
         )
         points = np.array(
             [
@@ -560,6 +568,7 @@ def reference_affine_bounding_box_helper(bounding_box, *, format, affine_matrix)
                 np.max(transformed_points[:, 0]).item(),
                 np.max(transformed_points[:, 1]).item(),
             ],
+            dtype=bbox_xyxy.dtype,
         )
         out_bbox = F.convert_format_bounding_box(
             out_bbox, old_format=datapoints.BoundingBoxFormat.XYXY, new_format=format_, inplace=True
@@ -844,6 +853,10 @@ KERNEL_INFOS.extend(
         KernelInfo(
             F.rotate_bounding_box,
             sample_inputs_fn=sample_inputs_rotate_bounding_box,
+            closeness_kwargs={
+                **scripted_vs_eager_double_pixel_difference("cpu", atol=1e-6, rtol=1e-6),
+                **scripted_vs_eager_double_pixel_difference("cuda", atol=1e-5, rtol=1e-5),
+            },
         ),
         KernelInfo(
             F.rotate_mask,
@@ -1275,6 +1288,8 @@ KERNEL_INFOS.extend(
                 **pil_reference_pixel_difference(2, mae=True),
                 **cuda_vs_cpu_pixel_difference(),
                 **float32_vs_uint8_pixel_difference(),
+                **scripted_vs_eager_double_pixel_difference("cpu", atol=1e-5, rtol=1e-5),
+                **scripted_vs_eager_double_pixel_difference("cuda", atol=1e-5, rtol=1e-5),
             },
         ),
         KernelInfo(
@@ -1294,7 +1309,11 @@ KERNEL_INFOS.extend(
         KernelInfo(
             F.perspective_video,
             sample_inputs_fn=sample_inputs_perspective_video,
-            closeness_kwargs=cuda_vs_cpu_pixel_difference(),
+            closeness_kwargs={
+                **cuda_vs_cpu_pixel_difference(),
+                **scripted_vs_eager_double_pixel_difference("cpu", atol=1e-5, rtol=1e-5),
+                **scripted_vs_eager_double_pixel_difference("cuda", atol=1e-5, rtol=1e-5),
+            },
         ),
     ]
 )

test/test_prototype_transforms_consistency.py

@@ -138,17 +138,28 @@ CONSISTENCY_CONFIGS = [
             NotScriptableArgsKwargs(5, padding_mode="symmetric"),
         ],
     ),
-    ConsistencyConfig(
-        prototype_transforms.LinearTransformation,
-        legacy_transforms.LinearTransformation,
-        [
-            ArgsKwargs(LINEAR_TRANSFORMATION_MATRIX, LINEAR_TRANSFORMATION_MEAN),
-        ],
-        # Make sure that the product of the height, width and number of channels matches the number of elements in
-        # `LINEAR_TRANSFORMATION_MEAN`. For example 2 * 6 * 3 == 4 * 3 * 3 == 36.
-        make_images_kwargs=dict(DEFAULT_MAKE_IMAGES_KWARGS, sizes=[(2, 6), (4, 3)], color_spaces=["RGB"]),
-        supports_pil=False,
-    ),
+    *[
+        ConsistencyConfig(
+            prototype_transforms.LinearTransformation,
+            legacy_transforms.LinearTransformation,
+            [
+                ArgsKwargs(LINEAR_TRANSFORMATION_MATRIX.to(matrix_dtype), LINEAR_TRANSFORMATION_MEAN.to(matrix_dtype)),
+            ],
+            # Make sure that the product of the height, width and number of channels matches the number of elements in
+            # `LINEAR_TRANSFORMATION_MEAN`. For example 2 * 6 * 3 == 4 * 3 * 3 == 36.
+            make_images_kwargs=dict(
+                DEFAULT_MAKE_IMAGES_KWARGS, sizes=[(2, 6), (4, 3)], color_spaces=["RGB"], dtypes=[image_dtype]
+            ),
+            supports_pil=False,
+        )
+        for matrix_dtype, image_dtype in [
+            (torch.float32, torch.float32),
+            (torch.float64, torch.float64),
+            (torch.float32, torch.uint8),
+            (torch.float64, torch.float32),
+            (torch.float32, torch.float64),
+        ]
+    ],
     ConsistencyConfig(
         prototype_transforms.Grayscale,
         legacy_transforms.Grayscale,

test/test_prototype_transforms_functional.py

@@ -142,7 +142,7 @@ class TestKernels:
             actual,
             expected,
             **info.get_closeness_kwargs(test_id, dtype=input.dtype, device=input.device),
-            msg=parametrized_error_message(*other_args, **kwargs),
+            msg=parametrized_error_message(*([actual, expected] + other_args), **kwargs),
         )
 
     def _unbatch(self, batch, *, data_dims):

torchvision/prototype/transforms/_misc.py

@@ -64,6 +64,11 @@ class LinearTransformation(Transform):
                 f"Input tensors should be on the same device. Got {transformation_matrix.device} and {mean_vector.device}"
             )
 
+        if transformation_matrix.dtype != mean_vector.dtype:
+            raise ValueError(
+                f"Input tensors should have the same dtype. Got {transformation_matrix.dtype} and {mean_vector.dtype}"
+            )
+
         self.transformation_matrix = transformation_matrix
         self.mean_vector = mean_vector
 
@@ -93,7 +98,9 @@ class LinearTransformation(Transform):
             )
 
         flat_tensor = inpt.reshape(-1, n) - self.mean_vector
-        transformed_tensor = torch.mm(flat_tensor, self.transformation_matrix)
+
+        transformation_matrix = self.transformation_matrix.to(flat_tensor.dtype)
+        transformed_tensor = torch.mm(flat_tensor, transformation_matrix)
         return transformed_tensor.reshape(shape)
 
 

torchvision/prototype/transforms/functional/_geometry.py

@@ -404,9 +404,13 @@ def _compute_affine_output_size(matrix: List[float], w: int, h: int) -> Tuple[in
 
 
 def _apply_grid_transform(
-    float_img: torch.Tensor, grid: torch.Tensor, mode: str, fill: datapoints.FillTypeJIT
+    img: torch.Tensor, grid: torch.Tensor, mode: str, fill: datapoints.FillTypeJIT
 ) -> torch.Tensor:
 
+    # We are using context knowledge that grid should have float dtype
+    fp = img.dtype == grid.dtype
+    float_img = img if fp else img.to(grid.dtype)
+
     shape = float_img.shape
     if shape[0] > 1:
         # Apply same grid to a batch of images
@@ -433,7 +437,9 @@ def _apply_grid_transform(
             # img * mask + (1.0 - mask) * fill = img * mask - fill * mask + fill = mask * (img - fill) + fill
             float_img = float_img.sub_(fill_img).mul_(mask).add_(fill_img)
 
-    return float_img
+    img = float_img.round_().to(img.dtype) if not fp else float_img
+
+    return img
 
 
 def _assert_grid_transform_inputs(
@@ -511,7 +517,6 @@ def affine_image_tensor(
 
     shape = image.shape
     ndim = image.ndim
-    fp = torch.is_floating_point(image)
 
     if ndim > 4:
         image = image.reshape((-1,) + shape[-3:])
@@ -535,13 +540,10 @@ def affine_image_tensor(
 
     _assert_grid_transform_inputs(image, matrix, interpolation.value, fill, ["nearest", "bilinear"])
 
-    dtype = image.dtype if fp else torch.float32
+    dtype = image.dtype if torch.is_floating_point(image) else torch.float32
     theta = torch.tensor(matrix, dtype=dtype, device=image.device).reshape(1, 2, 3)
     grid = _affine_grid(theta, w=width, h=height, ow=width, oh=height)
-    output = _apply_grid_transform(image if fp else image.to(dtype), grid, interpolation.value, fill=fill)
-
-    if not fp:
-        output = output.round_().to(image.dtype)
+    output = _apply_grid_transform(image, grid, interpolation.value, fill=fill)
 
     if needs_unsquash:
         output = output.reshape(shape)
@@ -612,7 +614,7 @@ def _affine_bounding_box_xyxy(
     # Single point structure is similar to
     # [(xmin, ymin, 1), (xmax, ymin, 1), (xmax, ymax, 1), (xmin, ymax, 1)]
     points = bounding_box[:, [[0, 1], [2, 1], [2, 3], [0, 3]]].reshape(-1, 2)
-    points = torch.cat([points, torch.ones(points.shape[0], 1, device=points.device)], dim=-1)
+    points = torch.cat([points, torch.ones(points.shape[0], 1, device=device, dtype=dtype)], dim=-1)
     # 2) Now let's transform the points using affine matrix
     transformed_points = torch.matmul(points, transposed_affine_matrix)
     # 3) Reshape transformed points to [N boxes, 4 points, x/y coords]
@@ -797,19 +799,15 @@ def rotate_image_tensor(
     matrix = _get_inverse_affine_matrix(center_f, -angle, [0.0, 0.0], 1.0, [0.0, 0.0])
 
     if image.numel() > 0:
-        fp = torch.is_floating_point(image)
         image = image.reshape(-1, num_channels, height, width)
 
         _assert_grid_transform_inputs(image, matrix, interpolation.value, fill, ["nearest", "bilinear"])
 
         ow, oh = _compute_affine_output_size(matrix, width, height) if expand else (width, height)
-        dtype = image.dtype if fp else torch.float32
+        dtype = image.dtype if torch.is_floating_point(image) else torch.float32
         theta = torch.tensor(matrix, dtype=dtype, device=image.device).reshape(1, 2, 3)
         grid = _affine_grid(theta, w=width, h=height, ow=ow, oh=oh)
-        output = _apply_grid_transform(image if fp else image.to(dtype), grid, interpolation.value, fill=fill)
-
-        if not fp:
-            output = output.round_().to(image.dtype)
+        output = _apply_grid_transform(image, grid, interpolation.value, fill=fill)
 
         new_height, new_width = output.shape[-2:]
     else:
@@ -1237,9 +1235,9 @@ def _perspective_grid(coeffs: List[float], ow: int, oh: int, dtype: torch.dtype,
 
     d = 0.5
     base_grid = torch.empty(1, oh, ow, 3, dtype=dtype, device=device)
-    x_grid = torch.linspace(d, ow + d - 1.0, steps=ow, device=device)
+    x_grid = torch.linspace(d, ow + d - 1.0, steps=ow, device=device, dtype=dtype)
     base_grid[..., 0].copy_(x_grid)
-    y_grid = torch.linspace(d, oh + d - 1.0, steps=oh, device=device).unsqueeze_(-1)
+    y_grid = torch.linspace(d, oh + d - 1.0, steps=oh, device=device, dtype=dtype).unsqueeze_(-1)
     base_grid[..., 1].copy_(y_grid)
     base_grid[..., 2].fill_(1)
 
@@ -1283,7 +1281,6 @@ def perspective_image_tensor(
 
     shape = image.shape
     ndim = image.ndim
-    fp = torch.is_floating_point(image)
 
     if ndim > 4:
         image = image.reshape((-1,) + shape[-3:])
@@ -1304,12 +1301,9 @@ def perspective_image_tensor(
     )
 
     oh, ow = shape[-2:]
-    dtype = image.dtype if fp else torch.float32
+    dtype = image.dtype if torch.is_floating_point(image) else torch.float32
     grid = _perspective_grid(perspective_coeffs, ow=ow, oh=oh, dtype=dtype, device=image.device)
-    output = _apply_grid_transform(image if fp else image.to(dtype), grid, interpolation.value, fill=fill)
-
-    if not fp:
-        output = output.round_().to(image.dtype)
+    output = _apply_grid_transform(image, grid, interpolation.value, fill=fill)
 
     if needs_unsquash:
         output = output.reshape(shape)
@@ -1494,8 +1488,12 @@ def elastic_image_tensor(
 
     shape = image.shape
     ndim = image.ndim
+
     device = image.device
-    fp = torch.is_floating_point(image)
+    dtype = image.dtype if torch.is_floating_point(image) else torch.float32
+    # We are aware that if input image dtype is uint8 and displacement is float64 then
+    # displacement will be casted to float32 and all computations will be done with float32
+    # We can fix this later if needed
 
     if ndim > 4:
         image = image.reshape((-1,) + shape[-3:])
@@ -1506,12 +1504,12 @@ def elastic_image_tensor(
     else:
         needs_unsquash = False
 
-    image_height, image_width = shape[-2:]
-    grid = _create_identity_grid((image_height, image_width), device=device).add_(displacement.to(device))
-    output = _apply_grid_transform(image if fp else image.to(torch.float32), grid, interpolation.value, fill=fill)
+    if displacement.dtype != dtype or displacement.device != device:
+        displacement = displacement.to(dtype=dtype, device=device)
 
-    if not fp:
-        output = output.round_().to(image.dtype)
+    image_height, image_width = shape[-2:]
+    grid = _create_identity_grid((image_height, image_width), device=device, dtype=dtype).add_(displacement)
+    output = _apply_grid_transform(image, grid, interpolation.value, fill=fill)
 
     if needs_unsquash:
         output = output.reshape(shape)
@@ -1531,13 +1529,13 @@ def elastic_image_pil(
     return to_pil_image(output, mode=image.mode)
 
 
-def _create_identity_grid(size: Tuple[int, int], device: torch.device) -> torch.Tensor:
+def _create_identity_grid(size: Tuple[int, int], device: torch.device, dtype: torch.dtype) -> torch.Tensor:
     sy, sx = size
-    base_grid = torch.empty(1, sy, sx, 2, device=device)
-    x_grid = torch.linspace((-sx + 1) / sx, (sx - 1) / sx, sx, device=device)
+    base_grid = torch.empty(1, sy, sx, 2, device=device, dtype=dtype)
+    x_grid = torch.linspace((-sx + 1) / sx, (sx - 1) / sx, sx, device=device, dtype=dtype)
     base_grid[..., 0].copy_(x_grid)
 
-    y_grid = torch.linspace((-sy + 1) / sy, (sy - 1) / sy, sy, device=device).unsqueeze_(-1)
+    y_grid = torch.linspace((-sy + 1) / sy, (sy - 1) / sy, sy, device=device, dtype=dtype).unsqueeze_(-1)
     base_grid[..., 1].copy_(y_grid)
 
     return base_grid
@@ -1552,7 +1550,11 @@ def elastic_bounding_box(
         return bounding_box
 
     # TODO: add in docstring about approximation we are doing for grid inversion
-    displacement = displacement.to(bounding_box.device)
+    device = bounding_box.device
+    dtype = bounding_box.dtype if torch.is_floating_point(bounding_box) else torch.float32
+
+    if displacement.dtype != dtype or displacement.device != device:
+        displacement = displacement.to(dtype=dtype, device=device)
 
     original_shape = bounding_box.shape
     bounding_box = (
@@ -1563,7 +1565,7 @@ def elastic_bounding_box(
     # Or add spatial_size arg and check displacement shape
     spatial_size = displacement.shape[-3], displacement.shape[-2]
 
-    id_grid = _create_identity_grid(spatial_size, bounding_box.device)
+    id_grid = _create_identity_grid(spatial_size, device=device, dtype=dtype)
     # We construct an approximation of inverse grid as inv_grid = id_grid - displacement
     # This is not an exact inverse of the grid
     inv_grid = id_grid.sub_(displacement)

torchvision/transforms/transforms.py

@@ -1078,6 +1078,11 @@ class LinearTransformation(torch.nn.Module):
                 f"Input tensors should be on the same device. Got {transformation_matrix.device} and {mean_vector.device}"
             )
 
+        if transformation_matrix.dtype != mean_vector.dtype:
+            raise ValueError(
+                f"Input tensors should have the same dtype. Got {transformation_matrix.dtype} and {mean_vector.dtype}"
+            )
+
         self.transformation_matrix = transformation_matrix
         self.mean_vector = mean_vector
 
@@ -1105,9 +1110,10 @@ class LinearTransformation(torch.nn.Module):
             )
 
         flat_tensor = tensor.view(-1, n) - self.mean_vector
-        transformed_tensor = torch.mm(flat_tensor, self.transformation_matrix)
-        tensor = transformed_tensor.view(shape)
-        return tensor
+
+        transformation_matrix = self.transformation_matrix.to(flat_tensor.dtype)
+        transformed_tensor = torch.mm(flat_tensor, transformation_matrix)
+        return transformed_tensor.view(shape)
 
     def __repr__(self) -> str:
         s = (