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TensorFlow forward/backward #2

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reyoung opened this issue Jun 16, 2017 · 0 comments
Open

TensorFlow forward/backward #2

reyoung opened this issue Jun 16, 2017 · 0 comments

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@reyoung
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reyoung commented Jun 16, 2017

注册函数 https://github.com/tensorflow/tensorflow/blob/master/tensorflow/core/ops/math_grad.cc#L85

  1. 设置最后一层的Gradient是1
  2. Sum Gradient 将所有Node节点的Gradient求和
  3. 如果所有的输入都不需要Gradient，break
  4. 如果输入也是NoGradient，Backward NoGradient
  5. 如果输入需要计算Gradient，但是输出中有一些NoGradient，将其Gradient设置为0
  6. 调用用户注册的函数，添加到Gradient中
  7. 添加dst_grad to pending_
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@reyoung