Unit Selection
From SpeechWiki
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! Frames | ! Frames | ||
| 756009 | | 756009 | ||
| + | |- | ||
| + | ! mistakes (contiguous strings of incorrect phones) with left/right presense of EOW as the only context) | ||
| + | | 3253 | ||
| + | |- | ||
| + | ! number of phonemes covered by mistakes in the corpus (coverage) | ||
| + | | 27097 | ||
| + | |- | ||
| + | ! converage by mistakes of length 1 | ||
| + | | 4621 | ||
| + | |- | ||
| + | ! number of mistakes with at least 5 occurrences | ||
| + | | 247 | ||
| + | |- | ||
| + | ! coverage by mistakes with at least 5 occurrences | ||
| + | | 9244 | ||
|} | |} | ||
Revision as of 04:13, 10 February 2009
Contents |
Error driven unit selection
Some statistics
| Utterances | 2000 |
|---|---|
| Phonemes (including EOW and | 95938 |
| Frames | 756009 |
| mistakes (contiguous strings of incorrect phones) with left/right presense of EOW as the only context) | 3253 |
| number of phonemes covered by mistakes in the corpus (coverage) | 27097 |
| converage by mistakes of length 1 | 4621 |
| number of mistakes with at least 5 occurrences | 247 |
| coverage by mistakes with at least 5 occurrences | 9244 |
This seems roughly consistent with http://myweb.tiscali.co.uk/wordscape/wordlist/phonfreq.html.
The number of triphone decision tree leaf nodes is essentially not correlated with any of {total Frames,total Phones, error Phones, error Frames} per phone. Since the units are chosen to maximally cover the mistakes in the corpus, this might suggest that deepening the triphone DTs is not the same thing as coming up with these error-based units.
Computational issues
At 5.5 minutes per utterance, decoding the entire training corpus (1,700,000 utterances) will take around 206 days on the empty cluster. That's too long. We make do with around 50000 utterances.
