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@ -1,3 +1,17 @@
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// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
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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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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// bin/arpa2fst.cc
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// bin/arpa2fst.cc
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//
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//
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// Copyright 2009-2011 Gilles Boulianne.
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// Copyright 2009-2011 Gilles Boulianne.
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@ -24,122 +38,130 @@
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#include "util/parse-options.h"
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#include "util/parse-options.h"
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int main(int argc, char *argv[]) {
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int main(int argc, char *argv[]) {
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using namespace kaldi; // NOLINT
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using namespace kaldi; // NOLINT
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try {
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try {
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const char *usage =
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const char *usage =
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"Convert an ARPA format language model into an FST\n"
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"Convert an ARPA format language model into an FST\n"
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"Usage: arpa2fst [opts] <input-arpa> <output-fst>\n"
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"Usage: arpa2fst [opts] <input-arpa> <output-fst>\n"
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" e.g.: arpa2fst --disambig-symbol=#0 --read-symbol-table="
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" e.g.: arpa2fst --disambig-symbol=#0 --read-symbol-table="
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"data/lang/words.txt lm/input.arpa G.fst\n\n"
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"data/lang/words.txt lm/input.arpa G.fst\n\n"
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"Note: When called without switches, the output G.fst will contain\n"
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"Note: When called without switches, the output G.fst will "
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"an embedded symbol table. This is compatible with the way a previous\n"
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"contain\n"
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"version of arpa2fst worked.\n";
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"an embedded symbol table. This is compatible with the way a "
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"previous\n"
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ParseOptions po(usage);
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"version of arpa2fst worked.\n";
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ArpaParseOptions options;
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ParseOptions po(usage);
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options.Register(&po);
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ArpaParseOptions options;
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// Option flags.
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options.Register(&po);
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std::string bos_symbol = "<s>";
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std::string eos_symbol = "</s>";
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// Option flags.
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std::string disambig_symbol;
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std::string bos_symbol = "<s>";
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std::string read_syms_filename;
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std::string eos_symbol = "</s>";
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std::string write_syms_filename;
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std::string disambig_symbol;
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bool keep_symbols = false;
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std::string read_syms_filename;
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bool ilabel_sort = true;
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std::string write_syms_filename;
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bool keep_symbols = false;
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po.Register("bos-symbol", &bos_symbol, "Beginning of sentence symbol");
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bool ilabel_sort = true;
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po.Register("eos-symbol", &eos_symbol, "End of sentence symbol");
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po.Register("disambig-symbol", &disambig_symbol,
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po.Register("bos-symbol", &bos_symbol, "Beginning of sentence symbol");
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"Disambiguator. If provided (e. g. #0), used on input side of "
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po.Register("eos-symbol", &eos_symbol, "End of sentence symbol");
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"backoff links, and <s> and </s> are replaced with epsilons");
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po.Register(
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po.Register("read-symbol-table", &read_syms_filename,
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"disambig-symbol",
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"Use existing symbol table");
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&disambig_symbol,
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po.Register("write-symbol-table", &write_syms_filename,
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"Disambiguator. If provided (e. g. #0), used on input side of "
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"Write generated symbol table to a file");
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"backoff links, and <s> and </s> are replaced with epsilons");
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po.Register("keep-symbols", &keep_symbols,
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po.Register("read-symbol-table",
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"Store symbol table with FST. Symbols always saved to FST if "
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&read_syms_filename,
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"symbol tables are neither read or written (otherwise symbols "
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"Use existing symbol table");
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"would be lost entirely)");
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po.Register("write-symbol-table",
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po.Register("ilabel-sort", &ilabel_sort, "Ilabel-sort the output FST");
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&write_syms_filename,
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"Write generated symbol table to a file");
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po.Read(argc, argv);
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po.Register(
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"keep-symbols",
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if (po.NumArgs() != 1 && po.NumArgs() != 2) {
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&keep_symbols,
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po.PrintUsage();
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"Store symbol table with FST. Symbols always saved to FST if "
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exit(1);
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"symbol tables are neither read or written (otherwise symbols "
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"would be lost entirely)");
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po.Register("ilabel-sort", &ilabel_sort, "Ilabel-sort the output FST");
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po.Read(argc, argv);
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if (po.NumArgs() != 1 && po.NumArgs() != 2) {
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po.PrintUsage();
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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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fst_wxfilename = po.GetOptArg(2);
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int64 disambig_symbol_id = 0;
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fst::SymbolTable *symbols;
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if (!read_syms_filename.empty()) {
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// Use existing symbols. Required symbols must be in the table.
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kaldi::Input kisym(read_syms_filename);
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symbols = fst::SymbolTable::ReadText(
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kisym.Stream(), PrintableWxfilename(read_syms_filename));
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if (symbols == NULL)
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KALDI_ERR << "Could not read symbol table from file "
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<< read_syms_filename;
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options.oov_handling = ArpaParseOptions::kSkipNGram;
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if (!disambig_symbol.empty()) {
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disambig_symbol_id = symbols->Find(disambig_symbol);
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if (disambig_symbol_id == -1) // fst::kNoSymbol
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KALDI_ERR << "Symbol table " << read_syms_filename
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<< " has no symbol for " << disambig_symbol;
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}
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} else {
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// Create a new symbol table and populate it from ARPA file.
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symbols = new fst::SymbolTable(PrintableWxfilename(fst_wxfilename));
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options.oov_handling = ArpaParseOptions::kAddToSymbols;
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symbols->AddSymbol("<eps>", 0);
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if (!disambig_symbol.empty()) {
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disambig_symbol_id = symbols->AddSymbol(disambig_symbol);
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}
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}
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// Add or use existing BOS and EOS.
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options.bos_symbol = symbols->AddSymbol(bos_symbol);
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options.eos_symbol = symbols->AddSymbol(eos_symbol);
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// If producing new (not reading existing) symbols and not saving them,
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// need to keep symbols with FST, otherwise they would be lost.
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if (read_syms_filename.empty() && write_syms_filename.empty())
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keep_symbols = true;
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// Actually compile LM.
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KALDI_ASSERT(symbols != NULL);
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ArpaLmCompiler lm_compiler(options, disambig_symbol_id, symbols);
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{
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Input ki(arpa_rxfilename);
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lm_compiler.Read(ki.Stream());
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}
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// Sort the FST in-place if requested by options.
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if (ilabel_sort) {
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fst::ArcSort(lm_compiler.MutableFst(), fst::StdILabelCompare());
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}
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// Write symbols if requested.
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if (!write_syms_filename.empty()) {
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kaldi::Output kosym(write_syms_filename, false);
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symbols->WriteText(kosym.Stream());
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}
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// Write LM FST.
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bool write_binary = true, write_header = false;
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kaldi::Output kofst(fst_wxfilename, write_binary, write_header);
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fst::FstWriteOptions wopts(PrintableWxfilename(fst_wxfilename));
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wopts.write_isymbols = wopts.write_osymbols = keep_symbols;
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lm_compiler.Fst().Write(kofst.Stream(), wopts);
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delete symbols;
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} catch (const std::exception &e) {
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std::cerr << e.what();
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return -1;
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}
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}
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std::string arpa_rxfilename = po.GetArg(1),
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fst_wxfilename = po.GetOptArg(2);
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int64 disambig_symbol_id = 0;
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fst::SymbolTable *symbols;
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if (!read_syms_filename.empty()) {
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// Use existing symbols. Required symbols must be in the table.
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kaldi::Input kisym(read_syms_filename);
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symbols = fst::SymbolTable::ReadText(
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kisym.Stream(), PrintableWxfilename(read_syms_filename));
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if (symbols == NULL)
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KALDI_ERR << "Could not read symbol table from file "
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<< read_syms_filename;
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options.oov_handling = ArpaParseOptions::kSkipNGram;
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if (!disambig_symbol.empty()) {
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disambig_symbol_id = symbols->Find(disambig_symbol);
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if (disambig_symbol_id == -1) // fst::kNoSymbol
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KALDI_ERR << "Symbol table " << read_syms_filename
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<< " has no symbol for " << disambig_symbol;
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}
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} else {
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// Create a new symbol table and populate it from ARPA file.
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symbols = new fst::SymbolTable(PrintableWxfilename(fst_wxfilename));
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options.oov_handling = ArpaParseOptions::kAddToSymbols;
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symbols->AddSymbol("<eps>", 0);
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if (!disambig_symbol.empty()) {
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disambig_symbol_id = symbols->AddSymbol(disambig_symbol);
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}
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}
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// Add or use existing BOS and EOS.
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options.bos_symbol = symbols->AddSymbol(bos_symbol);
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options.eos_symbol = symbols->AddSymbol(eos_symbol);
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// If producing new (not reading existing) symbols and not saving them,
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// need to keep symbols with FST, otherwise they would be lost.
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if (read_syms_filename.empty() && write_syms_filename.empty())
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keep_symbols = true;
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// Actually compile LM.
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KALDI_ASSERT(symbols != NULL);
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ArpaLmCompiler lm_compiler(options, disambig_symbol_id, symbols);
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{
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Input ki(arpa_rxfilename);
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lm_compiler.Read(ki.Stream());
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}
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// Sort the FST in-place if requested by options.
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if (ilabel_sort) {
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fst::ArcSort(lm_compiler.MutableFst(), fst::StdILabelCompare());
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}
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// Write symbols if requested.
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if (!write_syms_filename.empty()) {
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kaldi::Output kosym(write_syms_filename, false);
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symbols->WriteText(kosym.Stream());
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}
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// Write LM FST.
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bool write_binary = true, write_header = false;
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kaldi::Output kofst(fst_wxfilename, write_binary, write_header);
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fst::FstWriteOptions wopts(PrintableWxfilename(fst_wxfilename));
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wopts.write_isymbols = wopts.write_osymbols = keep_symbols;
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lm_compiler.Fst().Write(kofst.Stream(), wopts);
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delete symbols;
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} catch (const std::exception &e) {
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std::cerr << e.what();
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return -1;
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}
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}
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}
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Hui Zhang
3 years ago