Ubuntu上安装Kaldi

什么是Kaldi？
Kaldi is a speech recognition toolkit, freely available under the Apache License.
注意，Kaldi仅仅是一个工具包，不是一个语音识别框架，想做语音识别，框架还要自己写。

这里有一系列ASR开源软件的比较：
https://en.wikipedia.org/wiki/List_of_speech_recognition_software

可以看到Kaldi是唯一一个用DNN做声学模型的。

安装Kaldi很简单，傻瓜化，官网上提供了详尽的帮助。
http://kaldi-asr.org/doc/install.html

重点看一下需要的第三方库：
Software packages installed by Kaldi

The following tools and libraries come with installation scripts in the tools/ directory so you won’t have to install them yourself (note: this is a non-exhaustive list).

1. OpenFst: we compile against this and use it heavily. //有限状态机，实现上就是一个有向图，google开发的。
2. IRSTLM: this a language modeling toolkit. Some of the example scripts require it but it is not tightly integrated with Kaldi; we