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apply-global-cmvn.py
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executable file
·53 lines (40 loc) · 1.52 KB
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#!/usr/bin/env python
'''
Created on Aug 6, 2014
@author: chorows
'''
import sys
import os
import logging
import argparse
import numpy as np
import kaldi_io
if __name__ == '__main__':
print >>sys.stderr, os.path.basename(sys.argv[0]), " ".join(sys.argv[1:])
logging.basicConfig(level=logging.INFO)
parser = argparse.ArgumentParser(description="""Apply cmvn (cepstral mean and variance normalization).
If global stats are supplied, normalize by the global stats. Otherwise normalize per-utterance.
""", )
parser.add_argument('--global-stats', help="Global normalization stats")
parser.add_argument('in_rxfilename')
parser.add_argument('out_wxfilename')
args = parser.parse_args()
global_normalization = args.global_stats is not None
if global_normalization:
logging.info("Applying global normalization")
with kaldi_io.RandomAccessBaseFloatVectorReader(args.global_stats) as stats:
mean = stats['mean']
mean.shape = 1,-1
std = stats['std']
std.shape = 1,-1
else:
logging.info("Applying per-utterance normalization")
reader = kaldi_io.SequentialBaseFloatMatrixReader(args.in_rxfilename)
writer = kaldi_io.BaseFloatMatrixWriter(args.out_wxfilename)
for name, feats in reader:
if not global_normalization:
mean = feats.mean(0, keepdims=True)
std = feats.std(0, keepdims=True)
feats -= mean
feats /= std
writer.write(name, feats)