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Committing changes to support momentum and the --max-change option in my neural net training scripts.  Will ask Thang to integrate into the recipe (need to tune)

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- replacing nnet-trim-n-last-layers by "nnet-copy --remove-last-layers"




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- NN-training hyper-parameters now in classes NnetTrainOptions RbmTrainOptions
- removing nnet-trim-n-last-transforms (functionality now in nnet-copy --remove-last-layers)



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Fix bug in lat/sausages.cc whereby do_mbr_ was uninitialized (bad bug-- could randomly not do MBR or do it).

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Adding some internal code to the EventMap class, which was to be used for mapping phone-sets -- this was created for something I now won't be doing, but the internal code may be useful in future so I'm committing it.

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- nnet-train-mmi-sequential : fixed mmi objective computation
- nnet-train-mmi-sequential,nnet-train-mpe-sequential: removed cross-validation from sequence-based training tools
- nnet-forward : simplified the tool, the priors needs to be used in log-domain
- rbm-train-cd1 : enhancing log-prints



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- updated usage messages
- replacing the nnet training scripts by the v2 (updated version)



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- nnet-train-* : changing logging of progress (use KALDI_VLOG(1))



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Committing various changes: changes to pitch-interpolation code; a few extra things in neural net setup;some mostly minor script changes and extensions.

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Modifications to online decoding setup-- add tests for delta-features computation; rework it to pass the tests.

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Add new function to- stl-utils.h (fix compilation error caused by recent change in fstext/fstext-utils.h

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