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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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trunk: various script changes to better support Mac OS X.  Avoiding the '-T' option to 'cp', and the '>/dev/stderr' syntax in awk, which is only supported by GNU awk.  Also providing an alternative to 'du -b' for getting file sizes, to failover to 'stat' on Mac

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trunk: changes(many "stolen" from babel/s5b) to the VoxForge recipe in order to hopefully make it more OS X compatible.
       Not tested yet, so use with caution. The setup is now using SRILM instead of MITLM, and in general relies more
       on installation scripts from tools/.


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trunk: online-nnet2 setup: add capability to estimate iVector using subsets of utterances of a speaker, selected based on having a suitable amount of speech.  A tradeoff between utterance-specific and speaker-specific iVectors.

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trunk: online-nnet2 decoding setup: adding scripts which make it possible to estimate the iVectors per speaker, excluding silence (so not-truly-online decoding).  Some code changes for iVector which allow for scaling up the prior term when the data count exceeds a certain value (this seems to be important, for some reason).  And misc. code fixes.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4865 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8

(trunk/wsj) Previous version of the script wer_ops_details.pl didn't calculate the number of fields correctly 

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- splitting functions from src/nnet/nnet-various.h into src/nnet/nnet-utils.h, (src/nnet/nnet-various.h now contains only components)



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trunk: add multi-threaded online-nnet2 decoding program, online2-wav-nnet2-latgen-threaded, which does decoding and nnet evaluation in different threads.  Usage is otherwise similar to online2-wav-nnet2-latgen-faster.

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