谷歌憋了个大招:让机器像人类一样说话
2898
科技 2019-03-25 15:08:07 字数:812

谷歌旗下人工智能公司DeepMind近来憋了个大招,继AlphaGo赢了人类棋手后,他们又研制出了能够生成模仿人类语音的系统。



据外媒介绍,该系统让机器说话与人类说话之间的差距缩小了50%。DeepMind将这个系统命名为Wavenet。


让人能与机器对话一直是人类希望在人工智能领域里实现的目标。但是,目前用计算机生成语音仍然大量地依赖于TTS(文本到语音)拼接技术。在这个过程中,机器首先要记录一个说话人的声音片段,并基于此构建超大型的数据库,随后,经过再次结合过程,形成完整的表达。


WaveNet改变了这种旧范式,它直接对原始声音信号的声浪建模,每次对一个样本进行建模。和生成更加自然的语音一样,使用原始的声波意味着WaveNet能对任何音频建模,其中包括音乐。


研究人员称WaveNet能知道自己说的是什么。首先,研究人员通过把文本转化成一个语言与声学特征序列(这个序列包含了当下的声音、字母、词汇等),然后把这一序列喂到WaveNet中,从而能让模型了解到自己要说什么。


DeepMind是一家专注于人工智能的公司,于2010年成立于伦敦,并在2014年被谷歌以4亿英镑(约合5.32亿美元)收购。随后,DeepMind就获得了使用谷歌数据的权利,这对于他们训练自己的系统意义重大。这次训练WaveNet的数据用的就是谷歌TTS数据库。


训练结束后,研究人员可以把网络数据作为样本,产生合成的表达,进行取样,然后用到下一个步骤的预测中。


据外媒报道,目前谷歌还没有推出关于WaveNets的任何商业应用,因为它需要巨大的计算能力。语音正在成为人类和机器互动中越来越重要的手段,目前亚马逊、苹果、微软和谷歌都在投资能让用户通过语音进行交互的个人数字助理。DeepMind的这项技术也受到了来自各方面的关注。


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