Fix RandomResizedCrop scale & ratio argument. (#8944)

Co-authored-by: Nicolas Hug <[email protected]>

Author: GdoongMathew

test/test_transforms_v2.py

@@ -3758,12 +3758,18 @@ def test_transform_errors_warnings(self):
         with pytest.raises(ValueError, match="provide only two dimensions"):
             transforms.RandomResizedCrop(size=(1, 2, 3))
 
-        with pytest.raises(TypeError, match="Scale should be a sequence"):
+        with pytest.raises(TypeError, match="Scale should be a sequence of two floats."):
             transforms.RandomResizedCrop(size=self.INPUT_SIZE, scale=123)
 
-        with pytest.raises(TypeError, match="Ratio should be a sequence"):
+        with pytest.raises(TypeError, match="Ratio should be a sequence of two floats."):
             transforms.RandomResizedCrop(size=self.INPUT_SIZE, ratio=123)
 
+        with pytest.raises(TypeError, match="Ratio should be a sequence of two floats."):
+            transforms.RandomResizedCrop(size=self.INPUT_SIZE, ratio=[1, 2, 3])
+
+        with pytest.raises(TypeError, match="Scale should be a sequence of two floats."):
+            transforms.RandomResizedCrop(size=self.INPUT_SIZE, scale=[1, 2, 3])
+
         for param in ["scale", "ratio"]:
             with pytest.warns(match="Scale and ratio should be of kind"):
                 transforms.RandomResizedCrop(size=self.INPUT_SIZE, **{param: [1, 0]})

torchvision/transforms/v2/_geometry.py

@@ -254,10 +254,10 @@ def __init__(
         super().__init__()
         self.size = _setup_size(size, error_msg="Please provide only two dimensions (h, w) for size.")
 
-        if not isinstance(scale, Sequence):
-            raise TypeError("Scale should be a sequence")
-        if not isinstance(ratio, Sequence):
-            raise TypeError("Ratio should be a sequence")
+        if not isinstance(scale, Sequence) or len(scale) != 2:
+            raise TypeError("Scale should be a sequence of two floats.")
+        if not isinstance(ratio, Sequence) or len(ratio) != 2:
+            raise TypeError("Ratio should be a sequence of two floats.")
         if (scale[0] > scale[1]) or (ratio[0] > ratio[1]):
             warnings.warn("Scale and ratio should be of kind (min, max)")