How to use the fvcore.transforms.transform.TransformList function in fvcore

def test_register(self):
        """
        Test register.
        """
        dtype = "int"

        def add1(t, x):
            return x + 1

        def flip_sub_width(t, x):
            return x - t.width

        T.Transform.register_type(dtype, add1)
        T.HFlipTransform.register_type(dtype, flip_sub_width)

        transforms = T.TransformList(
            [
                T.ScaleTransform(0, 0, 0, 0, 0),
                T.CropTransform(0, 0, 0, 0),
                T.HFlipTransform(3),
            ]
        )
        self.assertEqual(transforms.apply_int(3), 2)

        with self.assertRaises(AssertionError):
            T.HFlipTransform.register_type(dtype, lambda x: 1)

def __radd__(self, other: "TransformList") -> "TransformList":
        """
        Args:
            other (TransformList): transformation to add.
        Returns:
            TransformList: list of transforms.
        """
        others = (
            other.transforms if isinstance(other, TransformList) else [other]
        )
        return TransformList(others + self.transforms)

def __add__(self, other: "TransformList") -> "TransformList":
        """
        Args:
            other (TransformList): transformation to add.
        Returns:
            TransformList: list of transforms.
        """
        others = (
            other.transforms if isinstance(other, TransformList) else [other]
        )
        return TransformList(self.transforms + others)

TransformList: contain the transforms that's used.
    """
    for g in transform_gens:
        assert isinstance(g, TransformGen), g

    check_dtype(img)

    tfms = []
    for g in transform_gens:
        tfm = g.get_transform(img)
        assert isinstance(
            tfm, Transform
        ), "TransformGen {} must return an instance of Transform! Got {} instead".format(g, tfm)
        img = tfm.apply_image(img)
        tfms.append(tfm)
    return img, TransformList(tfms)

def __radd__(self, other: "TransformList") -> "TransformList":
        """
        Args:
            other (TransformList): transformation to add.
        Returns:
            TransformList: list of transforms.
        """
        others = (
            other.transforms if isinstance(other, TransformList) else [other]
        )
        return TransformList(others + self.transforms)