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#!/usr/bin/env python3
# ====================================================================
# Copyright (c) 2009 Carnegie Mellon University. All rights
# reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# This work was supported in part by funding from the Defense Advanced
# Research Projects Agency and the National Science Foundation of the
# United States of America, and the CMU Sphinx Speech Consortium.
#
# THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
# ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
# NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# ====================================================================
"""
Functions for reading, writing, and creating Sphinx senone-to-codebook
mapping files (and eventually compressed versions thereof).
"""
__author__ = "David Huggins-Daines <dhdaines@gmail.com>"
from .s3file import S3File, S3File_write
import struct
import numpy
VERSION = "1.2"
def open(filename, mode="rb"):
if mode in ("r", "rb"):
return S3SenmgauFile(filename)
elif mode in ("w", "wb"):
return S3SenmgauFile_write(filename)
else:
raise Exception("mode must be 'r', 'rb', 'w', or 'wb'")
class S3SenmgauFile(S3File):
"Read Sphinx-III format senone mapping files"
def __init__(self, file, mode):
S3File.__init__(self, file, mode)
self._params = self._load()
def readgauheader(self):
if self.fileattr["version"] != VERSION:
raise Exception("Version mismatch: must be %s but is %s" %
(VERSION, self.fileattr["version"]))
def read_mapping(self):
"Read senone mapping (which uses uint32 instead of floats)"
self.nclust = struct.unpack(self.swap + "I", self.fh.read(4))[0]
self.nsen = struct.unpack(self.swap + "I", self.fh.read(4))[0]
mapping = numpy.fromfile(self.fh, "int32")
if self.otherend:
return mapping.byteswap()
else:
return mapping
def _load(self):
self.readgauheader()
self.fh.seek(self.data_start, 0)
return self.read_mapping()
class S3SenmgauFile_write(S3File_write):
"Write Sphinx-III format mixture weight files"
def __init__(self, filename=None, mode="wb", attr={"version": VERSION}):
S3File_write.__init__(self, filename, mode, attr)
def write_mapping(self, mapping):
"""
Write a senone to codebook mapping.
The mapping takes the form of a sequence of codebook IDs, one
for each senone.
"""
marr = numpy.array(mapping, 'int32')
# Number of codebooks (assumed they are sequential...)
self.fh.write(struct.pack("=I", marr.max() + 1))
# Number of senones
self.fh.write(struct.pack("=I", marr.shape[0]))
# Array of ints
marr.tofile(self.fh)
def write_ptm_senmgau(outfile, mdef):
"""
Create and write a senone to codebook mapping for phonetically
tied mixtures based on a model definition (s3mdef).
"""
mixwmap = numpy.zeros(mdef.n_sen, 'int32')
for i in range(0, mdef.n_sen):
mixwmap[i] = mdef.ciphone_id_from_senone_id(i)
S3SenmgauFile_write(outfile).write_mapping(mixwmap)
def write_ptm_ci_senmgau(outfile, mdef):
"""
Create and write a context-independent senone to codebook
mapping for phonetically tied mixtures based on a model
definition (s3mdef).
"""
mixwmap = numpy.zeros(mdef.n_ci_sen, 'int32')
for i in range(0, mdef.n_ci_sen):
mixwmap[i] = mdef.ciphone_id_from_senone_id(i)
S3SenmgauFile_write(outfile).write_mapping(mixwmap)
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