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// fstbin/fstcomposecontext.cc
// Copyright 2009-2011 Microsoft Corporation
// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#include "base/kaldi-common.h"
#include "util/common-utils.h"
#include "fst/fstlib.h"
#include "fstext/context-fst.h"
#include "fstext/grammar-context-fst.h"
#include "fstext/fstext-utils.h"
#include "fstext/kaldi-fst-io.h"
/*
A couple of test examples:
pushd ~/tmpdir
# (1) with no disambig syms.
( echo "0 1 1 1"; echo "1 2 2 2"; echo "2 3 3 3"; echo "3 0" ) | fstcompile | fstcomposecontext ilabels.sym > tmp.fst
( echo "<eps> 0"; echo "a 1"; echo "b 2"; echo "c 3" ) > phones.txt
fstmakecontextsyms phones.txt ilabels.sym > context.txt
fstprint --isymbols=context.txt --osymbols=phones.txt tmp.fst
# and the result is:
WARNING (fstcomposecontext[5.4]:main():fstcomposecontext.cc:130) Disambiguation symbols list is empty; this likely indicates an error in data preparation.
0 1 <eps> a
1 2 <eps>/a/b b
2 3 a/b/c c
3 4 b/c/<eps> <eps>
4
# (2) with disambig syms:
( echo 4; echo 5) > disambig.list
( echo "<eps> 0"; echo "a 1"; echo "b 2"; echo "c 3"; echo "#0 4"; echo "#1 5") > phones.txt
( echo "0 1 1 1"; echo "1 2 2 2"; echo " 2 3 4 4"; echo "3 4 3 3"; echo "4 5 5 5"; echo "5 0" ) | fstcompile > in.fst
fstcomposecontext --read-disambig-syms=disambig.list ilabels.sym in.fst tmp.fst
fstmakecontextsyms phones.txt ilabels.sym > context.txt
cp phones.txt phones_disambig.txt; ( echo "#0 4"; echo "#1 5" ) >> phones_disambig.txt
fstprint --isymbols=context.txt --osymbols=phones_disambig.txt tmp.fst
0 1 #-1 a
1 2 <eps>/a/b b
2 3 #0 #0
3 4 a/b/c c
4 5 #1 #1
5 6 b/c/<eps> <eps>
*/
int main(int argc, char *argv[]) {
try {
using namespace kaldi;
using namespace fst;
using kaldi::int32;
/*
# fstcomposecontext composes efficiently with a context fst
# that it generates. Without --disambig-syms specified, it
# assumes that all input symbols of in.fst are phones.
# It adds the subsequential symbol itself (it does not
# appear in the output so doesn't need to be specified by the user).
# the disambig.list is a list of disambiguation symbols on the LHS
# of in.fst. The symbols on the LHS of out.fst are indexes into
# the ilabels.list file, which is a kaldi-format file containing a
# vector<vector<int32> >, which specifies what the labels mean in
# terms of windows of symbols.
fstcomposecontext ilabels.sym [ in.fst [ out.fst ] ]
--disambig-syms=disambig.list
--context-size=3
--central-position=1
--binary=false
*/
const char *usage =
"Composes on the left with a dynamically created context FST\n"
"\n"
"Usage: fstcomposecontext <ilabels-output-file> [<in.fst> [<out.fst>] ]\n"
"E.g: fstcomposecontext ilabels.sym < LG.fst > CLG.fst\n";
ParseOptions po(usage);
bool binary = true;
std::string disambig_rxfilename,
disambig_wxfilename;
int32 context_width = 3, central_position = 1;
int32 nonterm_phones_offset = -1;
po.Register("binary", &binary,
"If true, output ilabels-output-file in binary format");
po.Register("read-disambig-syms", &disambig_rxfilename,
"List of disambiguation symbols on input of in.fst");
po.Register("write-disambig-syms", &disambig_wxfilename,
"List of disambiguation symbols on input of out.fst");
po.Register("context-size", &context_width, "Size of phone context window");
po.Register("central-position", ¢ral_position,
"Designated central position in context window");
po.Register("nonterm-phones-offset", &nonterm_phones_offset,
"The integer id of #nonterm_bos in your phones.txt, if present "
"(only relevant for grammar-FST construction, see "
"doc/grammar.dox");
po.Read(argc, argv);
if (po.NumArgs() < 1 || po.NumArgs() > 3) {
po.PrintUsage();
exit(1);
}
std::string ilabels_out_filename = po.GetArg(1),
fst_in_filename = po.GetOptArg(2),
fst_out_filename = po.GetOptArg(3);
VectorFst<StdArc> *fst = ReadFstKaldi(fst_in_filename);
if ( (disambig_wxfilename != "") && (disambig_rxfilename == "") )
KALDI_ERR << "fstcomposecontext: cannot specify --write-disambig-syms if "
"not specifying --read-disambig-syms\n";
std::vector<int32> disambig_in;
if (disambig_rxfilename != "")
if (!ReadIntegerVectorSimple(disambig_rxfilename, &disambig_in))
KALDI_ERR << "fstcomposecontext: Could not read disambiguation symbols from "
<< PrintableRxfilename(disambig_rxfilename);
if (disambig_in.empty()) {
KALDI_WARN << "Disambiguation symbols list is empty; this likely "
<< "indicates an error in data preparation.";
}
std::vector<std::vector<int32> > ilabels;
VectorFst<StdArc> composed_fst;
// Work gets done here (see context-fst.h)
if (nonterm_phones_offset < 0) {
// The normal case.
ComposeContext(disambig_in, context_width, central_position,
fst, &composed_fst, &ilabels);
} else {
// The grammar-FST case. See ../doc/grammar.dox for an intro.
if (context_width != 2 || central_position != 1) {
KALDI_ERR << "Grammar-fst graph creation only supports models with left-"
"biphone context. (--nonterm-phones-offset option was supplied).";
}
ComposeContextLeftBiphone(nonterm_phones_offset, disambig_in,
*fst, &composed_fst, &ilabels);
}
WriteILabelInfo(Output(ilabels_out_filename, binary).Stream(),
binary, ilabels);
if (disambig_wxfilename != "") {
std::vector<int32> disambig_out;
for (size_t i = 0; i < ilabels.size(); i++)
if (ilabels[i].size() == 1 && ilabels[i][0] <= 0)
disambig_out.push_back(static_cast<int32>(i));
if (!WriteIntegerVectorSimple(disambig_wxfilename, disambig_out)) {
std::cerr << "fstcomposecontext: Could not write disambiguation symbols to "
<< PrintableWxfilename(disambig_wxfilename) << '\n';
return 1;
}
}
WriteFstKaldi(composed_fst, fst_out_filename);
delete fst;
return 0;
} catch(const std::exception &e) {
std::cerr << e.what();
return -1;
}
}