Fix ReduceMax op bool type problem.

mindspore/ops/operations/math_ops.py

@@ -497,6 +497,8 @@ class ReduceMax(_Reduce):
         super(ReduceMax, self).__init__(keep_dims)
         self.__setattr_flag__ = True
 
+    def __infer__(self, input_x, axis):
+        return self.do_infer(input_x, axis, mstype.number_type + (mstype.bool_,))
 
 class ReduceMin(_Reduce):
     """