There are some techniques that can be used to reverse a relationship if the flow of logic requires it. For instance, the higher-level module could expose a required interface which will be implemented by the lower-level module. That’s the Dependency Inversion Principle on the module level. One of the other possibilities is to introduce a mediator pattern.
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ToP12 耗时的算子就是 Mul 和 ReduceSum,所以重点是优化 Mul 和 ReduceSum 算子。