// lmbin/arpa-to-const-arpa.cc
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// Copyright 2014 Guoguo Chen
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// See ../../COPYING for clarification regarding multiple authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
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// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
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// MERCHANTABILITY OR NON-INFRINGEMENT.
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// See the Apache 2 License for the specific language governing permissions and
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// limitations under the License.
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#include <string>
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#include "lm/const-arpa-lm.h"
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#include "util/parse-options.h"
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int main(int argc, char *argv[]) {
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using namespace kaldi;
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typedef kaldi::int32 int32;
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try {
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const char *usage =
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"Converts an Arpa format language model into ConstArpaLm format,\n"
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"which is an in-memory representation of the pre-built Arpa language\n"
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"model. The output language model can then be read in by a program\n"
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"that wants to rescore lattices. We assume that the words in the\n"
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"input arpa language model has been converted to integers.\n"
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"\n"
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"The program is used jointly with utils/map_arpa_lm.pl to build\n"
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"ConstArpaLm format language model. We first map the words in an Arpa\n"
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"format language model to integers using utils/map_arpa_m.pl, and\n"
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"then use this program to build a ConstArpaLm format language model.\n"
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"\n"
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"Usage: arpa-to-const-arpa [opts] <input-arpa> <const-arpa>\n"
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" e.g.: arpa-to-const-arpa --bos-symbol=1 --eos-symbol=2 \\\n"
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" arpa.txt const_arpa";
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kaldi::ParseOptions po(usage);
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ArpaParseOptions options;
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options.Register(&po);
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// Ideally, these registrations would be in ArpaParseOptions, but some
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// programs want integers and other want symbols, so we register them
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// outside instead.
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po.Register("unk-symbol", &options.unk_symbol,
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"Integer corresponds to unknown-word in language model. -1 if "
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"no such word is provided.");
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po.Register("bos-symbol", &options.bos_symbol,
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"Integer corresponds to <s>. You must set this to your actual "
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"BOS integer.");
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po.Register("eos-symbol", &options.eos_symbol,
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"Integer corresponds to </s>. You must set this to your actual "
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"EOS integer.");
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po.Read(argc, argv);
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if (po.NumArgs() != 2) {
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po.PrintUsage();
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exit(1);
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}
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if (options.bos_symbol == -1 || options.eos_symbol == -1) {
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KALDI_ERR << "Please set --bos-symbol and --eos-symbol.";
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exit(1);
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}
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std::string arpa_rxfilename = po.GetArg(1),
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const_arpa_wxfilename = po.GetOptArg(2);
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bool ans = BuildConstArpaLm(options, arpa_rxfilename,
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const_arpa_wxfilename);
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if (ans)
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return 0;
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else
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return 1;
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} catch(const std::exception &e) {
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std::cerr << e.what() << '\n';
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return -1;
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}
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}
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