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arXiv 1608.01281cs.LGcs.CL
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利用连续奖励策略梯度学习在线匹配

Learning Online Alignments with Continuous Rewards Policy Gradient

Institute for Interdisciplinary Information Sciences(交叉信息研究院);Tsinghua University(清华大学);Google Brain(谷歌大脑);Open AI(OpenAI)

Yuping Luo, Chung-Cheng Chiu, Navdeep Jaitly, Ilya Sutskever

摘要:

具有软注意力的序列到序列模型在机器翻译、语音识别和问答中取得了显著的成功。尽管它们有能力且易于使用,但它们要求在推理开始时整个输入序列可用,这一假设对于即时翻译和语音识别是无效的。为了解决这个问题,我们提出了一种新的方法来解决序列到序列的问题,使用硬在线比对,而不是软离线比对。在线比对模型能够开始产生输出,而不需要首先处理整个输入序列。高度精确的在线序列到序列模型是有用的,因为它可以用于构建精确的基于语音的瞬时翻译器。我们的模型使用硬二进制随机决策来选择将产生输出的时间步长。该模型使用标准的策略梯度方法进行训练以产生这些随机决策。在我们的实验中,我们表明,该模型取得了令人鼓舞的性能TIMIT和华尔街日报(WSJ)语音识别数据集。

英文摘要:

Sequence-to-sequence models with soft attention had significant success in machine translation, speech recognition, and question answering. Though capable and easy to use, they require that the entirety of the input sequence is available at the beginning of inference, an assumption that is not valid for instantaneous translation and speech recognition. To address this problem, we present a new method for solving sequence-to-sequence problems using hard online alignments instead of soft offline alignments. The online alignments model is able to start producing outputs without the need to first process the entire input sequence. A highly accurate online sequence-to-sequence model is useful because it can be used to build an accurate voice-based instantaneous translator. Our model uses hard binary stochastic decisions to select the timesteps at which outputs will be produced. The model is trained to produce these stochastic decisions using a standard policy gradient method. In our experiments, we show that this model achieves encouraging performance on TIMIT and Wall Street Journal (WSJ) speech recognition datasets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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