-feat
. And no, haha. In this case, the implementation is a modification of an already existing mechanism for feature extraction. And it looks a little different for pocketsphinx and Sphinx4. But let's order.-remove_noise
and -lifter
. For -remove_noise
you need to set the value to yes
(however, this is its default value), and the usual value of the -lifter
parameter is 22. If you set it in the main config: $CFG_LIFTER = "22"; # Cepstrum lifter is smoothing to improve recognition
-lifter __CFG_LIFTER__
-transform
. Its default value is legacy
, but we need dct
. So, in order to train noise-proof models, we need to set a trio of parameters in feat.params: -transform dct -remove_noise yes -lifter 22
$CFG_TRANSFORM = "dct"; # Previously legacy transform is used, but dct is more accurate $CFG_LIFTER = "22"; # Cepstrum lifter is smoothing to improve recognition
-transform __CFG_TRANSFORM__ -remove_noise yes -lifter __CFG_LIFTER__
# Configuration script for sphinx trainer -*-mode:Perl-*- $CFG_VERBOSE = 1; # Determines how much goes to the screen. # These are filled in at configuration time $CFG_DB_NAME = "voxforge_en"; # Experiment name, will be used to name model files and log files $CFG_EXPTNAME = "$CFG_DB_NAME"; # Directory containing SphinxTrain binaries $CFG_BASE_DIR = "/home/speechdat/voxforge-en"; $CFG_SPHINXTRAIN_DIR = "/usr/local/lib/sphinxtrain"; $CFG_BIN_DIR = "/usr/local/libexec/sphinxtrain"; $CFG_SCRIPT_DIR = "/usr/local/lib/sphinxtrain/scripts"; # Audio waveform and feature file information $CFG_WAVFILES_DIR = "$CFG_BASE_DIR/wav"; $CFG_WAVFILE_EXTENSION = 'wav'; $CFG_WAVFILE_TYPE = 'mswav'; # one of nist, mswav, raw $CFG_FEATFILES_DIR = "$CFG_BASE_DIR/feat"; $CFG_FEATFILE_EXTENSION = 'mfc'; $CFG_VECTOR_LENGTH = 13; # Feature extraction parameters $CFG_WAVFILE_SRATE = 16000.0; $CFG_NUM_FILT = 40; # For wideband speech it's 40, for telephone 8khz reasonable value is 31 $CFG_LO_FILT = 133.33334; # For telephone 8kHz speech value is 200 $CFG_HI_FILT = 6855.4976; # For telephone 8kHz speech value is 3500 $CFG_TRANSFORM = "dct"; # Previously legacy transform is used, but dct is more accurate $CFG_LIFTER = "22"; # Cepstrum lifter is smoothing to improve recognition $CFG_MIN_ITERATIONS = 1; # BW Iterate at least this many times $CFG_MAX_ITERATIONS = 10; # BW Don't iterate more than this, somethings likely wrong. # (none/max) Type of AGC to apply to input files $CFG_AGC = 'none'; # (current/none) Type of cepstral mean subtraction/normalization # to apply to input files $CFG_CMN = 'current'; $CFG_CMNINIT = 10.0; # (yes/no) Normalize variance of input files to 1.0 $CFG_VARNORM = 'no'; # (yes/no) Train full covariance matrices $CFG_FULLVAR = 'no'; # (yes/no) Use diagonals only of full covariance matrices for # Forward-Backward evaluation (recommended if CFG_FULLVAR is yes) $CFG_DIAGFULL = 'no'; # (yes/no) Perform vocal tract length normalization in training. This # will result in a "normalized" model which requires VTLN to be done # during decoding as well. $CFG_VTLN = 'no'; # Starting warp factor for VTLN $CFG_VTLN_START = 0.80; # Ending warp factor for VTLN $CFG_VTLN_END = 1.40; # Step size of warping factors $CFG_VTLN_STEP = 0.05; # Directory to write queue manager logs to $CFG_QMGR_DIR = "$CFG_BASE_DIR/qmanager"; # Directory to write training logs to $CFG_LOG_DIR = "$CFG_BASE_DIR/logdir"; # Directory for re-estimation counts $CFG_BWACCUM_DIR = "$CFG_BASE_DIR/bwaccumdir"; # Directory to write model parameter files to $CFG_MODEL_DIR = "$CFG_BASE_DIR/model_parameters"; # Directory containing transcripts and control files for # speaker-adaptive training $CFG_LIST_DIR = "$CFG_BASE_DIR/etc"; # Decoding variables for MMIE training $CFG_LANGUAGEWEIGHT = "11.5"; $CFG_BEAMWIDTH = "1e-100"; $CFG_WORDBEAM = "1e-80"; $CFG_LANGUAGEMODEL = "$CFG_LIST_DIR/${CFG_DB_NAME}_full.lm.DMP"; $CFG_WORDPENALTY = "0.2"; # Lattice pruning variables $CFG_ABEAM = "1e-50"; $CFG_NBEAM = "1e-10"; $CFG_PRUNED_DENLAT_DIR = "$CFG_BASE_DIR/pruned_denlat"; # MMIE training related variables $CFG_MMIE = "no"; $CFG_MMIE_MAX_ITERATIONS = 5; $CFG_LATTICE_DIR = "$CFG_BASE_DIR/lattice"; $CFG_MMIE_TYPE = "best"; # Valid values are "rand", "best" or "ci" $CFG_MMIE_CONSTE = "3.0"; $CFG_NUMLAT_DIR = "$CFG_BASE_DIR/numlat"; $CFG_DENLAT_DIR = "$CFG_BASE_DIR/denlat"; # Variables used in main training of models $CFG_DICTIONARY = "$CFG_LIST_DIR/$CFG_DB_NAME.dict"; $CFG_RAWPHONEFILE = "$CFG_LIST_DIR/$CFG_DB_NAME.phone"; $CFG_FILLERDICT = "$CFG_LIST_DIR/$CFG_DB_NAME.filler"; $CFG_LISTOFFILES = "$CFG_LIST_DIR/${CFG_DB_NAME}_full.fileids"; $CFG_TRANSCRIPTFILE = "$CFG_LIST_DIR/${CFG_DB_NAME}_full.transcription"; $CFG_FEATPARAMS = "$CFG_LIST_DIR/feat.params"; # Variables used in characterizing models $CFG_HMM_TYPE = '.cont.'; # Sphinx 4, PocketSphinx #$CFG_HMM_TYPE = '.semi.'; # PocketSphinx #$CFG_HMM_TYPE = '.ptm.'; # PocketSphinx (larger data sets) if (($CFG_HMM_TYPE ne ".semi.") and ($CFG_HMM_TYPE ne ".ptm.") and ($CFG_HMM_TYPE ne ".cont.")) { die "Please choose one CFG_HMM_TYPE out of '.cont.', '.ptm.', or '.semi.', " . "currently $CFG_HMM_TYPE\n"; } # This configuration is fastest and best for most acoustic models in # PocketSphinx and Sphinx-III. See below for Sphinx-II. $CFG_STATESPERHMM = 3; $CFG_SKIPSTATE = 'no'; if ($CFG_HMM_TYPE eq '.semi.') { $CFG_DIRLABEL = 'semi'; # Four stream features for PocketSphinx $CFG_FEATURE = "s2_4x"; $CFG_NUM_STREAMS = 4; $CFG_INITIAL_NUM_DENSITIES = 256; $CFG_FINAL_NUM_DENSITIES = 256; die "For semi continuous models, the initial and final models have the same density" if ($CFG_INITIAL_NUM_DENSITIES != $CFG_FINAL_NUM_DENSITIES); } elsif ($CFG_HMM_TYPE eq '.ptm.') { $CFG_DIRLABEL = 'ptm'; # Four stream features for PocketSphinx $CFG_FEATURE = "s2_4x"; $CFG_NUM_STREAMS = 4; $CFG_INITIAL_NUM_DENSITIES = 64; $CFG_FINAL_NUM_DENSITIES = 64; die "For phonetically tied models, the initial and final models have the same density" if ($CFG_INITIAL_NUM_DENSITIES != $CFG_FINAL_NUM_DENSITIES); } elsif ($CFG_HMM_TYPE eq '.cont.') { $CFG_DIRLABEL = 'cont'; # Single stream features - Sphinx 3 $CFG_FEATURE = "1s_c_d_dd"; $CFG_NUM_STREAMS = 1; $CFG_INITIAL_NUM_DENSITIES = 1; $CFG_FINAL_NUM_DENSITIES = 32; die "The initial has to be less than the final number of densities" if ($CFG_INITIAL_NUM_DENSITIES > $CFG_FINAL_NUM_DENSITIES); } # Number of top gaussians to score a frame. A little bit less accurate computations # make training significantly faster. Uncomment to apply this during the training # For good accuracy make sure you are using the same setting in decoder # In theory this can be different for various training stages. For example 4 for # CI stage and 16 for CD stage # $CFG_CI_TOPN = 4; # $CFG_CD_TOPN = 16; # (yes/no) Train multiple-gaussian context-independent models (useful # for alignment, use 'no' otherwise) in the models created # specifically for forced alignment $CFG_FALIGN_CI_MGAU = 'no'; # (yes/no) Train multiple-gaussian context-independent models (useful # for alignment, use 'no' otherwise) $CFG_CI_MGAU = 'no'; # Number of tied states (senones) to create in decision-tree clustering $CFG_N_TIED_STATES = 3000; # How many parts to run Forward-Backward estimatinon in $CFG_NPART = 1; # (yes/no) Train a single decision tree for all phones (actually one # per state) (useful for grapheme-based models, use 'no' otherwise) $CFG_CROSS_PHONE_TREES = 'no'; # Use force-aligned transcripts (if available) as input to training $CFG_FORCEDALIGN = 'no'; # Use a specific set of models for force alignment. If not defined, # context-independent models for the current experiment will be used. $CFG_FORCE_ALIGN_MDEF = "$CFG_BASE_DIR/model_architecture/$CFG_EXPTNAME.falign_ci.mdef"; $CFG_FORCE_ALIGN_MODELDIR = "$CFG_MODEL_DIR/$CFG_EXPTNAME.falign_ci_$CFG_DIRLABEL"; # Use a specific dictionary and filler dictionary for force alignment. # If these are not defined, a dictionary and filler dictionary will be # created from $CFG_DICTIONARY and $CFG_FILLERDICT, with noise words # removed from the filler dictionary and added to the dictionary (this # is because the force alignment is not very good at inserting them) # $CFG_FORCE_ALIGN_DICTIONARY = "$ST::CFG_BASE_DIR/falignout$ST::CFG_EXPTNAME.falign.dict";; # $CFG_FORCE_ALIGN_FILLERDICT = "$ST::CFG_BASE_DIR/falignout/$ST::CFG_EXPTNAME.falign.fdict";; # Use a particular beam width for force alignment. The wider # (ie smaller numerically) the beam, the fewer sentences will be # rejected for bad alignment. $CFG_FORCE_ALIGN_BEAM = 1e-60; # Calculate an LDA/MLLT transform? $CFG_LDA_MLLT = 'yes'; # Dimensionality of LDA/MLLT output $CFG_LDA_DIMENSION = 29; # This is actually just a difference in log space (it doesn't make # sense otherwise, because different feature parameters have very # different likelihoods) $CFG_CONVERGENCE_RATIO = 0.1; # Queue::POSIX for multiple CPUs on a local machine # Queue::PBS to use a PBS/TORQUE queue $CFG_QUEUE_TYPE = "Queue::POSIX"; # Name of queue to use for PBS/TORQUE $CFG_QUEUE_NAME = "workq"; # (yes/no) Build questions for decision tree clustering automatically $CFG_MAKE_QUESTS = "yes"; # If CFG_MAKE_QUESTS is yes, questions are written to this file. # If CFG_MAKE_QUESTS is no, questions are read from this file. $CFG_QUESTION_SET = "${CFG_BASE_DIR}/model_architecture/${CFG_EXPTNAME}.tree_questions"; #$CFG_QUESTION_SET = "${CFG_BASE_DIR}/linguistic_questions"; $CFG_CP_OPERATION = "${CFG_BASE_DIR}/model_architecture/${CFG_EXPTNAME}.cpmeanvar"; # This variable has to be defined, otherwise utils.pl will not load. $CFG_DONE = 1; return 1;
-alpha 0.97 -dither yes -doublebw no -nfilt __CFG_NUM_FILT__ -ncep __CFG_VECTOR_LENGTH__ -lowerf __CFG_LO_FILT__ -upperf __CFG_HI_FILT__ -samprate __CFG_WAVFILE_SRATE__ -nfft 512 -wlen 0.0256 -transform __CFG_TRANSFORM__ -feat __CFG_FEATURE__ -agc __CFG_AGC__ -cmn __CFG_CMN__ -varnorm __CFG_VARNORM__ -remove_noise yes -lifter __CFG_LIFTER__
-transform
, -remove_noise
and -lifter
. And if we want to use Sphinx4, then we need to include Denoise components in the frontend and slightly change the frontend itself. The corresponding pipeline will look something like this: <component name="mfcFrontEnd" type="edu.cmu.sphinx.frontend.FrontEnd"> <propertylist name="pipeline"> <item>audioFileDataSource</item> <item>dither</item> <item>preemphasizer</item> <item>windower</item> <item>fft</item> <item>melFilterBank</item> <item>denoise</item> <item>dct</item> <item>lifter</item> <item>batchCMN</item> <item>featureExtraction</item> <item>featureTransform</item> </propertylist> </component> <component name="audioFileDataSource" type="edu.cmu.sphinx.frontend.util.AudioFileDataSource"> </component> <component name="preemphasizer" type="edu.cmu.sphinx.frontend.filter.Preemphasizer"> </component> <component name="dither" type="edu.cmu.sphinx.frontend.filter.Dither"> </component> <component name="windower" type="edu.cmu.sphinx.frontend.window.RaisedCosineWindower"> </component> <component name="fft" type="edu.cmu.sphinx.frontend.transform.DiscreteFourierTransform"> </component> <component name="melFilterBank" type="edu.cmu.sphinx.frontend.frequencywarp.MelFrequencyFilterBank"> <property name="numberFilters" value="40"/> <property name="minimumFrequency" value="133.33334"/> <property name="maximumFrequency" value="6855.4976"/> </component> <component name="denoise" type="edu.cmu.sphinx.frontend.denoise.Denoise"> </component> <component name="dct" type="edu.cmu.sphinx.frontend.transform.DiscreteCosineTransform2"> </component> <component name="lifter" type="edu.cmu.sphinx.frontend.transform.Lifter"> </component> <component name="batchCMN" type="edu.cmu.sphinx.frontend.feature.BatchCMN"> </component> <component name="featureExtraction" type="edu.cmu.sphinx.frontend.feature.DeltasFeatureExtractor"> </component> <component name="featureTransform" type="edu.cmu.sphinx.frontend.feature.FeatureTransform"> <property name="loader" value="modelLoader"/> </component>
Source: https://habr.com/ru/post/227099/
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