backward compatibility in ms tensor check

pygmtools/mindspore_backend.py

@@ -509,11 +509,15 @@ def _check_data_type(input: mindspore.Tensor, var_name, raise_err):
     """
     mindspore implementation of _check_data_type
     """
-    if raise_err:
-        if type(input) is not mindspore.Tensor or type(input) is not mindspore.common._stub_tensor.StubTensor:
-            raise ValueError(f'Expected MindSpore Tensor{f" for variable {var_name}" if var_name is not None else ""}, '
-                             f'but got {type(input)}.')
-    return type(input) is mindspore.Tensor
+    ms_types = [mindspore.Tensor]
+    if hasattr(mindspore.common, '_stub_tensor'):  # MS tensor may be automatically transformed to StubTensor
+        ms_types += [mindspore.common._stub_tensor.StubTensor]
+    is_tensor = any([type(input) is t for t in ms_types])
+
+    if raise_err and not is_tensor:
+        raise ValueError(f'Expected MindSpore Tensor{f" for variable {var_name}" if var_name is not None else ""}, '
+                         f'but got {type(input)}.')
+    return is_tensor
 
 
 def _check_shape(input, dim_num):