!1561 Added transform list check to Python ComposeOp operation

Merge pull request !1561 from alashkari/ua-ops-v2

mindspore/dataset/transforms/vision/py_transforms.py

@@ -32,7 +32,7 @@ from .validators import check_prob, check_crop, check_resize_interpolation, chec
     check_normalize_py, check_random_crop, check_random_color_adjust, check_random_rotation, \
     check_transforms_list, check_random_apply, check_ten_crop, check_num_channels, check_pad, \
     check_random_perspective, check_random_erasing, check_cutout, check_linear_transform, check_random_affine, \
-    check_mix_up, check_positive_degrees, check_uniform_augment_py
+    check_mix_up, check_positive_degrees, check_uniform_augment_py, check_compose_list
 from .utils import Inter, Border
 
 DE_PY_INTER_MODE = {Inter.NEAREST: Image.NEAREST,
@@ -75,6 +75,7 @@ class ComposeOp:
         >>> dataset = dataset.map(input_columns="image", operations=transform())
     """
 
+    @check_compose_list
     def __init__(self, transforms):
         self.transforms = transforms
 

mindspore/dataset/transforms/vision/validators.py

@@ -907,3 +907,25 @@ def check_positive_degrees(method):
         return method(self, **kwargs)
 
     return new_method
+
+
+def check_compose_list(method):
+    """Wrapper method to check the transform list of ComposeOp."""
+
+    @wraps(method)
+    def new_method(self, *args, **kwargs):
+        transforms = (list(args) + [None])[0]
+        if "transforms" in kwargs:
+            transforms = kwargs.get("transforms")
+        if transforms is None:
+            raise ValueError("transforms is not provided.")
+        if not transforms:
+            raise ValueError("transforms list is empty.")
+        if not isinstance(transforms, list):
+            raise TypeError("transforms is not a python list")
+
+        kwargs["transforms"] = transforms
+
+        return method(self, **kwargs)
+
+    return new_method