symbol-table.cc
2.1 KB
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/**
* Copyright 2022 Xiaomi Corporation (authors: Fangjun Kuang)
*
* See LICENSE 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "sherpa-onnx/csrc/symbol-table.h"
#include <cassert>
#include <fstream>
#include <sstream>
namespace sherpa_onnx {
SymbolTable::SymbolTable(const std::string &filename) {
std::ifstream is(filename);
std::string sym;
int32_t id;
while (is >> sym >> id) {
if (sym.size() >= 3) {
// For BPE-based models, we replace ▁ with a space
// Unicode 9601, hex 0x2581, utf8 0xe29681
const uint8_t *p = reinterpret_cast<const uint8_t *>(sym.c_str());
if (p[0] == 0xe2 && p[1] == 0x96 && p[2] == 0x81) {
sym = sym.replace(0, 3, " ");
}
}
assert(!sym.empty());
assert(sym2id_.count(sym) == 0);
assert(id2sym_.count(id) == 0);
sym2id_.insert({sym, id});
id2sym_.insert({id, sym});
}
assert(is.eof());
}
std::string SymbolTable::ToString() const {
std::ostringstream os;
char sep = ' ';
for (const auto &p : sym2id_) {
os << p.first << sep << p.second << "\n";
}
return os.str();
}
const std::string &SymbolTable::operator[](int32_t id) const {
return id2sym_.at(id);
}
int32_t SymbolTable::operator[](const std::string &sym) const {
return sym2id_.at(sym);
}
bool SymbolTable::contains(int32_t id) const { return id2sym_.count(id) != 0; }
bool SymbolTable::contains(const std::string &sym) const {
return sym2id_.count(sym) != 0;
}
std::ostream &operator<<(std::ostream &os, const SymbolTable &symbol_table) {
return os << symbol_table.ToString();
}
} // namespace sherpa_onnx