Created by: Aurelius84

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Describe

Refine check_type Error Message for @declarative

Sample code:

with fluid.dygraph.guard():
    x = fluid.dygraph.to_variable(np.zeros([10, 10]))

y = fluid.layers.matmul(x, x)

报错输出：

TypeError: Please use fluid.dygraph.guard() as context to run it in imperative Mode.
Because the type of 'y' in matmul is a imperative Variable.