What does gmm-est do?

[willy8...@gmail.com]

Hi, I've founded that Kaldi mainly uses command gmm-est in several GMM-HMM training script such as train_mono.sh, train_deltas.sh, etc.
The manual of gmm-est says it "Do Maximum Likelihood re-estimation of GMM-based acoustic model", which as I know means traditional Baum-Welch reestimation method. However some people told me it implements segmental k-means optimization algorithm rather than Baum-Welch.
Can somebody give me the answer? And another question is if this did means Baum-Welch algorithm then is there any command that allows segmetal k-means algorithm?
Thanks.

[Daniel Povey]

It's Baum-Welch.  I'm not even sure what segmental k-means is, but it sounds like something quite obscure and not in the mainstream of speech recognition.

Dan

--
You received this message because you are subscribed to the Google Groups "kaldi-help" group.
To unsubscribe from this group and stop receiving emails from it, send an email to kaldi-help+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Xiang Li]

Segmental k-means is a HTK term, which means GMM-BW + realign in Kaldi, IIRC. 

And the corresponding commands are in every GMM-HMM training script, for example train_mono.sh.

HMM-BW in HTK book means GMM-BW + forward-backward in Kaldi.

Kaldi uses Viterbi instead of FB.

在 2016年4月6日星期三 UTC+8下午12:08:16，willy8...@gmail.com写道：