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[DoubleGrad PR #1] Decoupled code generation logics for Dygraph ForwardFunctions and GradNodes #40937

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jim19930609
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Refactored the original DygraphSingleFunctionGenerator class to decouple code generation logics for Forward Functions and GradNodes. After this patch, dygraph code generation will have 3 different classes involved:

  1. A base class "DygraphFunctionGeneratorBase", which is responsible for YamlParsing, ValidationCheck and Preprocessings for parsed contents.
  2. "DygraphForwardFunctionGenerator", which focus on generating dygraph_forward_functions only.
  3. "DygraphNodeGenerator", the recursion unit to generate 1st-order to higher-order GradNodes.

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LGTM

@jim19930609 jim19930609 merged commit 86554d9 into PaddlePaddle:develop Mar 28, 2022
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