!13896 Add float64 support to cumsum

From: @peilin-wang
Reviewed-by: @liangchenghui,@c_34
Signed-off-by: @liangchenghui

mindspore/ops/operations/math_ops.py

@@ -992,7 +992,7 @@ class CumSum(PrimitiveWithInfer):
         if axis['value'] is None:
             raise ValueError(f"For {self.name}, axis must be const.")
         validator.check_value_type('axis', axis['value'], [int], cls_name)
-        valid_dtypes = [mstype.uint8, mstype.int8, mstype.int32, mstype.float16, mstype.float32]
+        valid_dtypes = [mstype.uint8, mstype.int8, mstype.int32, mstype.float16, mstype.float32, mstype.float64]
         validator.check_tensor_dtype_valid('x', x['dtype'], valid_dtypes, cls_name)
         return {'shape': x_shp,
                 'dtype': x['dtype'],