add Max strategy for sequence_pool op #4864
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luotao1
commented
Oct 17, 2017
luotao1
commented
- solve part2 of Add sequence_pool op #4186
- simplify test_pool_py
- add comments for different pooling strategies. add SQRT/LAST/FIRST strategy for Seqpool #4788 (review)
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qingqing01
reviewed
Oct 20, 2017
paddle/operators/sequence_pool_op.h
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| case MAX: { | ||
| auto in_t = in->Slice<T>(static_cast<int>(lod[i]), | ||
| static_cast<int>(lod[i + 1])); | ||
| auto out_t = out->Slice<T>(i, i + 1); |
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Need to update code, the Slice remove the template T: https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/framework/tensor.h#L124
paddle/operators/sequence_pool_op.h
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| auto ones = in_g_e.constant(1); | ||
| auto zeros = in_g_e.constant(0); | ||
| in_g_e.device(place) = | ||
| out_g_e.broadcast(bcast) * equals.select(ones, zeros); |
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It's better to keep the same way with the MaxSeqPool in the old framework, which records the max indexes in the forward and uses them in the backward. Since there may be multiple maximum values.
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Done. 在反向中采用maxCoeff函数，获得每列中的第一个最大值。
考虑到inference的效率，保持前向不变，maxCoeff加在反向中。
目前实现的版本性能上还有待优化，等之后的PR修复。
qingqing01
approved these changes
Oct 27, 2017
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