check shape of vector input, should not be a scalar

paddle/py_paddle/dataprovider_converter.py

@@ -110,9 +110,9 @@ class DenseScanner(IScanner):
                 raise ValueError(
                     "The dimension of input cannot be greater than 3.")
             if len(self.__shape__) == 0:
-                self.__dim__ = 1
-            else:
-                self.__dim__ = reduce(lambda x, y: x * y, self.__shape__)
+                raise ValueError(
+                    "The input should be a vector, please check your input data.")
+            self.__dim__ = reduce(lambda x, y: x * y, self.__shape__)
             if len(self.__shape__) == 1 and self.__dim__ != self.input_type.dim:
                 raise ValueError(
                     "The data size must be equal to it in data layer.")