paddle-eager-graph
Paddle 动态图（Eager Mode）导航索引
Paddle 动态图边执行边建图：前向执行时构建反向图，调用 backward() 时按拓扑序执行反向图。
前向调用链路
Python paddle.add(x, y)
│
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① ops_api.cc ─ Python-C 映射，GetTensorFromArgs 提取 Tensor
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② eager_op_function.cc ─ 参数解析 / Dist Tensor / 释放 GIL / backend 选择
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③ dygraph_functions.cc ─ AMP / Type Promotion / 创建 GradNode / 构建反向图
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④ api.cc ─ KernelKey 构造 / Kernel 选择 / PrepareData / InferMeta
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⑤ PHI Kernel 执行
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