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trunk: In speaker ID system replaced PLDA length-normalization with the simpler form of length-normalization as performed in the binary ivector-normalize-length. This results in a 1% improvement for PLDA both before and after adaptation in the SRE08 example.

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trunk,nnet1 : adding support to --one-silence-class, however this is probably not the main problem in sMBR step, need to have a look at this...



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(trunk/egs/wsj) The script cleanup/find_bad_utts.sh now provides the user with much more additional info that could be useful when figuring what is wrong + some minor fixes of the error analysis scripts

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trunk: src/nnet2/nnet-compute-discriminative.cc: Fixed minor bug in computing objective function stats for printing (nan for mmi numerator loglike)

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trunk: Adding option to IvectorExtractor which diagonalizes the quadratic term in the objective function. This has the effect of reordering the iVectors' dimensions from most important to least important, which may make them easier to view.

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- lstm : implemented gradient-clipping, extended gradient print to show stats of forward / backward pass.
- nnet-loss.cc : bugfix in Xent::Eval (avoiding log(0) in cross-entropy computation)
- nnet-pdf-priors.{h,cc},nnet-forward.cc : refactored, behavior stays the same
- train-transitions : updates transition probabilities in transition model (but there was no WER improvment)




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trunk: adding new option --one-silence-class to sMBR/MPE discriminative training code and scripts... seems to be useful in ASPIRE to prevent discriminatively trained nnets generating too many insertions; need to test in other scenarios.

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trunk: bug-fix to table reading code that meant that when ,p option was used with scp: input, objects were re-read unnecessarily; this caused slowness in extract-segments (thanks to Yenda for noticing the problem).

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trunk: some minor script extensions relating to online-nnet2 (thanks to Vijay for some of it); cosmetic code change.

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trunk: Decoder fixes so that the --min-active option is respected more accurately (should help speed too); efficiency improvements and extra option in CMVN code; various cosmetic improvements.

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trunk: changes to the librispeech setup to improve compatibility with systems using older versions of Bash(e.g. OS X)

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Adding scripts incorporating word-dependent silence probabilities in making lexicon fst. Fixed a few bugs in some nnet2 scripts

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