115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
// sherpa-onnx/csrc/symbol-table.cc
|
|
//
|
|
// Copyright (c) 2022-2023 Xiaomi Corporation
|
|
|
|
#include "sherpa-onnx/csrc/symbol-table.h"
|
|
|
|
#include <cassert>
|
|
#include <fstream>
|
|
#include <sstream>
|
|
|
|
#if __ANDROID_API__ >= 9
|
|
#include <strstream>
|
|
|
|
#include "android/asset_manager.h"
|
|
#include "android/asset_manager_jni.h"
|
|
#endif
|
|
|
|
#include "sherpa-onnx/csrc/base64-decode.h"
|
|
#include "sherpa-onnx/csrc/onnx-utils.h"
|
|
|
|
namespace sherpa_onnx {
|
|
|
|
SymbolTable::SymbolTable(const std::string &filename) {
|
|
std::ifstream is(filename);
|
|
Init(is);
|
|
}
|
|
|
|
#if __ANDROID_API__ >= 9
|
|
SymbolTable::SymbolTable(AAssetManager *mgr, const std::string &filename) {
|
|
auto buf = ReadFile(mgr, filename);
|
|
|
|
std::istrstream is(buf.data(), buf.size());
|
|
Init(is);
|
|
}
|
|
#endif
|
|
|
|
void SymbolTable::Init(std::istream &is) {
|
|
std::string sym;
|
|
int32_t id = 0;
|
|
while (is >> sym >> id) {
|
|
#if 0
|
|
// we disable the test here since for some multi-lingual BPE models
|
|
// from NeMo, the same symbol can appear multiple times with different IDs.
|
|
if (sym != " ") {
|
|
assert(sym2id_.count(sym) == 0);
|
|
}
|
|
#endif
|
|
|
|
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 {
|
|
std::string sym = id2sym_.at(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, " ");
|
|
}
|
|
}
|
|
|
|
// for byte-level BPE
|
|
// id 0 is blank, id 1 is sos/eos, id 2 is unk
|
|
if (id >= 3 && id <= 258 && sym.size() == 6 && sym[0] == '<' &&
|
|
sym[1] == '0' && sym[2] == 'x' && sym[5] == '>') {
|
|
std::ostringstream os;
|
|
os << std::hex << std::uppercase << (id - 3);
|
|
|
|
if (std::string(sym.data() + 3, sym.data() + 5) == os.str()) {
|
|
uint8_t i = id - 3;
|
|
sym = std::string(&i, &i + 1);
|
|
}
|
|
}
|
|
return sym;
|
|
}
|
|
|
|
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();
|
|
}
|
|
|
|
void SymbolTable::ApplyBase64Decode() {
|
|
sym2id_.clear();
|
|
for (auto &p : id2sym_) {
|
|
p.second = Base64Decode(p.second);
|
|
sym2id_[p.second] = p.first;
|
|
}
|
|
}
|
|
|
|
} // namespace sherpa_onnx
|