Add faq about pack_padded_sequence & pad_packed_sequence API #4066
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Ligoml
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Nov 11, 2021
docs/faq/train_cn.md
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| ##### 问题：在paddle中如何实现`torch.nn.utils.rnn.pack_padded_sequence`和`torch.nn.utils.rnn.pad_packed_sequence`这两个API吗？ |
Ligoml
reviewed
Nov 11, 2021
docs/faq/train_cn.md
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| + 答复：目前paddle中没有和上述两个API完全对应的实现。关于torch中这两个API的详细介绍可以参考知乎上的文章 [pack_padded_sequence 和 pad_packed_sequence](https://zhuanlan.zhihu.com/p/342685890) : | ||
| `pack_padded_sequence`的功能是将mini-batch数据进行压缩，压缩掉无效的填充值，然后输入RNN网络中；`pad_packed_sequence`则是把RNN网络输出的压紧的序列再填充回来，便于进行后续的处理。 | ||
| 在paddle中，大家可以在GRU、LSTM等RNN网络中输入含有填充值的mini-batch数据的同时传入对应的`sequence_length`参数实现上述等价功能，具体用法可以参考 [RNN API文档](https://www.paddlepaddle.org.cn/documentation/docs/zh/api/paddle/nn/RNN_cn.html#rnn) 。 |
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- [RNN API文档] --> [RNN]
- 能否给个示例代码？
Contributor
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- done
- 这个代码示例需要配合很多的torch代码，暂时先不加。
Ligoml
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Nov 12, 2021
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Add faq about pack_padded_sequence & pad_packed_sequence API