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sandbox/online: Pitch features, add testing code; bug fixes in post-processing; make the #frames compatible with MFCC and with the old pitch code; add --pov-offset option which will be useful for online pitch extraction

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sandbox/online: change the default value of --add-deltas option to false in online-feature-pipeline.

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sandbox/online: update prepare_online_decoding.sh script to work with the new command-line flags for online-feature-pipeline.

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sandbox/online: 1. Add new command-line flags to online-feature-pipeline. 2. Append pitch features after cmvn.

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sandbox/online: add code to recompute NCCF at a set time using more stable signal-energy (reduces change from moving to online operation); add command-line options to compute-kaldi-pitch-feats to allow outputting online-mode feats.

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trunk: modify nnet2 training scripts to set priors based on posteriors on train data (not better but safer); some minor recipe fixes and updates, including raw-fMLLR+nnet training scripts.

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updated p-norm network training recipe, ensemble traning recipe, and discrimative tranining recipe on top of them

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1, Reference code to show how to utilize larger temporal context for beter performance for OnlinePostProcessPitch.
2, Dropped unused variables.
Need re-factoring to be more efficient.

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sandbox/online: some slight refactoring of pitch extraction code, which will make it easier to make certain later changes.

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1, Minor code fix, and add some comments for OnlinePostProcessPitch.
2, Correct not-up-to-date conflict, due to misunderstanding.

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1, Added 'OnlinePostProcessPitch' into feat/pitch-functions.* code.
2, Added support of online pitch in online-feature-pipeline, as well as steps/online/prepare_online_decoding.sh.
3, Fix some code conflict brought by r3880, and cleaned up of 'cpplint' errors for pitch related codes in 'feat'.
Yanqing Sun & Junjie Wang

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sandbox/online: merging trunk; cosmetic changes; online-decoding script fix (thanks to Simon Klupfel); changing config filename for online decoding from 'config' to 'online_decoding.conf'

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