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Diffstat (limited to 'tutorial')
| -rw-r--r-- | tutorial/howto_pretrain_from_kaldi.rst | 105 |
1 files changed, 63 insertions, 42 deletions
diff --git a/tutorial/howto_pretrain_from_kaldi.rst b/tutorial/howto_pretrain_from_kaldi.rst index ff6ef3d..6b8253a 100644 --- a/tutorial/howto_pretrain_from_kaldi.rst +++ b/tutorial/howto_pretrain_from_kaldi.rst @@ -7,38 +7,53 @@ How to Use a Pretrained nnet Model from Kaldi NERV finetune. Finally it shows two possible ways to decode the finetuned model in Kaldi framework. -- Locate the egs/timit inside Kaldi trunk directory. +- Note: in this tutorial, we use the following notations to denote the directory prefix: -- Configure ``cmd.sh`` and ``path.sh`` according to your machine setting. + - ``<nerv_home>``: the path of NERV (the location of outer most directory ``nerv``) -- Open the ``run.sh`` and locate the line saying ``exit 0 # From this point - you can run Karel's DNN: local/nnet/run_dnn.sh``. Uncomment this line. This - is because in this tutorial, we only want to train a basic tri-phone DNN, - so we simply don't do MMI training, system combination or fancy things like - these. + - ``<timit_home>``: the working directory of timit (the location of directory ``timit/s5``) -- Run ``./run.sh`` to start the training stages. After that, we will get +- Locate the ``egs/timit`` inside Kaldi trunk directory. + +- Configure ``<timit_home>/cmd.sh`` and ``<timit_home>/path.sh`` according to your machine setting. + +- Open the ``<timit_home>/run.sh`` and locate the line saying + + :: + + exit 0 # From this point you can run Karel's DNN: local/nnet/run_dnn.sh + . + Uncomment this line. This is because in this tutorial, we only want to train + a basic tri-phone DNN, so we simply don't do MMI training, system combination + or fancy things like these. + +- Run ``./run.sh`` (at ``<timit_home>``) to start the training stages. After that, we will get tri-phone GMM-HMM trained and the aligned labels. Let's move forward to pretrain a DNN. -- Open ``local/nnet/run_dnn.sh``, there are again several stages. Note that - the first stage is what we actually need (pretraining the DNN), since in - this tutorial we want to demonstrate how to get the pretrained model from - stage 1, replace stage 2 with NERV (finetune per-frame cross-entropy), and - decode using the finetuned network. However, here we add a line ``exit 0`` - after stage 2 to preserve stage 2 in order to compare the NERV result - against the standard one (the decode result using finetuned model produced - by the original stage 2). +- Open ``<timit_home>/local/nnet/run_dnn.sh``, there are again several stages. + Note that the first stage is what we actually need (pretraining the DNN), + since in this tutorial we want to demonstrate how to get the pretrained model + from stage 1, replace stage 2 with NERV (finetune per-frame cross-entropy), + and decode using the finetuned network. However, here we add a line ``exit + 0`` after stage 2 to preserve stage 2 in order to compare the NERV result + against the standard one (the decode result using finetuned model produced by + the original stage 2). -- Run ``local/nnet/run_dnn.sh`` (first two stages). +- Run ``local/nnet/run_dnn.sh`` (at ``<timit_home>``, for first two stages). - You'll find directory like ``dnn4_pretrain-dbn`` and - ``dnn4_pretrain-dbn_dnn`` inside the ``exp/``. They correspond to stage 1 and - stage 2 respectively. To use NERV to do stage 2 instead, we need the - pretrained network and the global transformation from stage 1: + ``dnn4_pretrain-dbn_dnn`` inside the ``<timit_home>/exp/``. They correspond + to stage 1 and stage 2 respectively. To use NERV to do stage 2 instead, we + need the pretrained network and the global transformation from stage 1: - - Check the file ``exp/dnn4_pretrain-dbn/6.dbn`` exists. (pretrained network) - - Check the file ``exp/dnn4_pretrain-dbn/tr_splice5_cmvn-g.nnet`` exists. (global transformation) - - Run script from ``kaldi_io/tools/convert_from_kaldi_pretrain.sh`` to + - Check the file ``<timit_home>/exp/dnn4_pretrain-dbn/6.dbn`` exists. + (pretrained network) + + - Check the file + ``<timit_home>/exp/dnn4_pretrain-dbn/tr_splice5_cmvn-g.nnet`` exists. + (global transformation) + + - Run script from ``<nerv_home>/speech/kaldi_io/tools/convert_from_kaldi_pretrain.sh`` to generate the parameters for the output layer and the script files for training and cross-validation set. @@ -47,18 +62,25 @@ How to Use a Pretrained nnet Model from Kaldi example, ``affine0_ltp`` and ``bias0``. These names should correspond to the identifiers used in the declaration of the network. Luckily, this tutorial comes with a written network declaration at - ``nerv/examples/timit_baseline2.lua``. + ``<nerv_home>/nerv/examples/timit_baseline2.lua``. + +- Copy the file ``<nerv_home>/nerv/examples/timit_baseline2.lua`` to + ``<timit_home>/timit_mybaseline.lua``, and change the line containing + ``/speechlab`` to your own setting. -- Copy the file ``nerv/examples/timit_baseline2.lua`` to - ``timit_mybaseline.lua``, and change the line containing ``/speechlab`` to - your own setting. +- Start the NERV training by + + :: + + <nerv_home>/install/bin/nerv <nerv_home>/nerv/examples/asr_trainer.lua timit_mybaseline.lua -- Start the NERV training by ``install/bin/nerv nerv/examples/asr_trainer.lua timit_mybaseline.lua``. + (at ``<timit_home>``). - - ``install/bin/nerv`` is the program which sets up the NERV environment, + - ``<nerv_home>/install/bin/nerv`` is the program which sets up the NERV environment, - - followed by an argument ``nerv/examples/asr_trainer.lua`` which is the script - you actually want to run (the general DNN training scheduler), + - followed by an argument ``<nerv_home>/nerv/examples/asr_trainer.lua`` which + is the script you actually want to run (the general DNN training + scheduler), - followed by an argument ``timit_mybaseline.lua`` to the scheduler, specifying the network you want to train and some relevant settings, such @@ -74,19 +96,17 @@ How to Use a Pretrained nnet Model from Kaldi global transformation chunk file once used in training. This part lets the decoder know about the set of parameters for decoding. - - Copy the script ``nerv/speech/kaldi_io/README.timit`` to your Kaldi - working directory (``timit/s5``) and modify the paths listed in the - script. + - Copy the script ``<nerv_home>/nerv/speech/kaldi_io/README.timit`` to + ``<timit_home>`` and modify the paths listed in the script. - - Run the modified ``README.timit`` in ``s5`` directory (where there is the - ``path.sh``). + - Run the modified ``README.timit`` (at ``<timit_home>``). - - After decoding, run ``bash RESULT exp/dnn4_nerv`` to see the results. + - After decoding, run ``bash RESULT exp/dnn4_nerv_dnn`` to see the results. - Plan B: In this plan, we manually convert the trained model back to Kaldi nnet format, and use Kaldi to decode. - - Create a copy of ``nerv/speech/kaldi_io/tools/nerv_to_kaldi.lua``. + - Create a copy of ``<nerv_home>/nerv/speech/kaldi_io/tools/nerv_to_kaldi.lua``. - Modify the list named ``lnames`` to list the name of layers you want to put into the output Kaldi parameter file in order. (You don't actually @@ -103,14 +123,15 @@ How to Use a Pretrained nnet Model from Kaldi :: cat your_trained_params.nerv your_global_trans.nerv > all.nerv - install/bin/nerv nerv_to_kaldi.lua timit_mybaseline.lua all.nerv your_kaldi_output.nnet + <nerv_home>/install/bin/nerv nerv_to_kaldi.lua timit_mybaseline.lua all.nerv your_kaldi_output.nnet - - Finally, locate the directory of stage 2: ``exp/dnn4_pretrain-dbn_dnn`` - and temporarily change the symbolic link for the final network file to the converted one: + - Finally, locate the directory of stage 2: + ``<timit_home>/exp/dnn4_pretrain-dbn_dnn`` and temporarily change the + symbolic link for the final network file to the converted one: :: - cd exp/dnn4_pretrain-dbn_dnn + cd <timit_home>/exp/dnn4_pretrain-dbn_dnn mv final.nnet final.nnet.orig ln -sv your_kaldi_output.nnet final.nnet |