!801 fix checking bug of prelu

Merge pull request !801 from fary86/fix_checking_bug_of_prelu

mindspore/ops/operations/nn_ops.py

@@ -2066,8 +2066,9 @@ class PReLU(PrimitiveWithInfer):
         return input_x_shape
 
     def infer_dtype(self, input_x_dtype, weight_dtype):
-        args = {"input_x": input_x_dtype, "weight": weight_dtype}
-        validator.check_tensor_type_same(args, (mstype.float16, mstype.float32), self.name)
+        valid_types = (mstype.float16, mstype.float32)
+        validator.check_tensor_type_same({"input_x": input_x_dtype}, valid_types, self.name)
+        validator.check_tensor_type_same({"weight": weight_dtype}, valid_types, self.name)
         return input_x_dtype