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// Copyright 2016 Google Inc.
//
// 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 "model_interface.h"
#include <algorithm>
#include "sentencepiece_model.pb.h"
#include "third_party/absl/strings/str_format.h"
#include "util.h"
namespace sentencepiece {
ModelInterface::ModelInterface(const ModelProto &model_proto)
: model_proto_(&model_proto), status_(util::OkStatus()) {}
ModelInterface::~ModelInterface() {}
#define RETURN_PIECE(name, default_value) \
if (model_proto_->trainer_spec().name().empty()) return default_value; \
return model_proto_->trainer_spec().name();
absl::string_view ModelInterface::unk_piece() const {
RETURN_PIECE(unk_piece, "<unk>");
}
absl::string_view ModelInterface::bos_piece() const {
RETURN_PIECE(bos_piece, "<s>");
}
absl::string_view ModelInterface::eos_piece() const {
RETURN_PIECE(eos_piece, "</s>");
}
absl::string_view ModelInterface::pad_piece() const {
RETURN_PIECE(pad_piece, "<pad>");
}
#undef RETURN_PIECE
int ModelInterface::PieceToId(absl::string_view piece) const {
auto it = reserved_id_map_.find(piece);
if (it != reserved_id_map_.end()) {
return it->second;
}
auto it2 = pieces_.find(piece);
if (it2 != pieces_.end()) {
return it2->second;
}
return unk_id_;
}
void ModelInterface::InitializePieces() {
pieces_.clear();
reserved_id_map_.clear();
unk_id_ = -1;
std::set<absl::string_view> user_defined_symbols;
std::vector<bool> byte_found(256, false);
int pieces_size = 0;
int reserved_id_map_size = 0;
for (int i = 0; i < model_proto_->pieces_size(); ++i) {
const auto &sp = model_proto_->pieces(i);
const bool is_normal_piece =
(sp.type() == ModelProto::SentencePiece::NORMAL ||
sp.type() == ModelProto::SentencePiece::USER_DEFINED ||
sp.type() == ModelProto::SentencePiece::UNUSED);
if (is_normal_piece) {
++pieces_size;
} else {
++reserved_id_map_size;
}
}
pieces_.reserve(pieces_size);
reserved_id_map_.reserve(reserved_id_map_size);
for (int i = 0; i < model_proto_->pieces_size(); ++i) {
const auto &sp = model_proto_->pieces(i);
if (sp.piece().empty()) {
status_ = util::InternalError("piece must not be empty.");
return;
}
const bool is_normal_piece =
(sp.type() == ModelProto::SentencePiece::NORMAL ||
sp.type() == ModelProto::SentencePiece::USER_DEFINED ||
sp.type() == ModelProto::SentencePiece::UNUSED);
if (!port::InsertIfNotPresent(
is_normal_piece ? &pieces_ : &reserved_id_map_, sp.piece(), i)) {
status_ = util::InternalError(sp.piece() + " is already defined.");
return;
}
if (sp.type() == ModelProto::SentencePiece::USER_DEFINED) {
user_defined_symbols.insert(sp.piece());
}
if (sp.type() == ModelProto::SentencePiece::UNKNOWN) {
if (unk_id_ >= 0) {
status_ = util::InternalError("unk is already defined.");
return;
}
unk_id_ = i;
}
if (sp.type() == ModelProto::SentencePiece::BYTE) {
if (!model_proto_->trainer_spec().byte_fallback()) {
status_ =
util::InternalError("byte piece " + sp.piece() +
" is found although `byte_fallback` is false.");
return;
}
const int byte = PieceToByte(sp.piece());
if (0 <= byte && byte < 256) {
byte_found[byte] = true;
} else {
status_ =
util::InternalError("byte piece " + sp.piece() + " is invalid.");
return;
}
}
}
if (unk_id_ == -1) {
status_ = util::InternalError("unk is not defined.");
return;
}
if (model_proto_->trainer_spec().byte_fallback()) {
// Checks that there are 256 byte pieces.
if (std::find(byte_found.begin(), byte_found.end(), false) !=
byte_found.end()) {
status_ = util::InternalError(
"there are not 256 byte pieces although `byte_fallback` is true.");
return;
}
}
matcher_ = std::make_unique<normalizer::PrefixMatcher>(user_defined_symbols);
}
std::vector<absl::string_view> SplitIntoWords(absl::string_view text,
bool treat_ws_as_suffix,
bool allow_ws_only_pieces) {
const char *begin = text.data();
const char *end = text.data() + text.size();
// Space symbol (U+2581)
const absl::string_view kSpaceSymbol = "\xe2\x96\x81";
bool in_ws_sequence = false;
std::vector<absl::string_view> result;
if (treat_ws_as_suffix) { // put ws tokens at the end of non-ws sequences.
if (begin < end) result.emplace_back(begin, 0);
while (begin < end) {
const int mblen =
std::min<int>(string_util::OneCharLen(begin), end - begin);
const bool is_ws = absl::string_view(begin, mblen) == kSpaceSymbol;
if (is_ws) { // keep track of sequences consecutive ws tokens.
in_ws_sequence = true;
} else if (in_ws_sequence) {
if (allow_ws_only_pieces) result.emplace_back(begin, 0);
in_ws_sequence = false;
}
result.back() =
absl::string_view(result.back().data(), result.back().size() + mblen);
begin += mblen;
if (begin < end && is_ws && !allow_ws_only_pieces)
result.emplace_back(begin, 0);
}
} else {
while (begin < end) {
const int mblen =
std::min<int>(string_util::OneCharLen(begin), end - begin);
bool is_ws = absl::string_view(begin, mblen) == kSpaceSymbol;
// if is whitespace (and not in sequence if allow_ws_only_pieces is True)
if (begin == text.data() ||
(is_ws && (!in_ws_sequence || !allow_ws_only_pieces))) {
result.emplace_back(begin, 0); // add empty string piece.
in_ws_sequence = true;
}
if (in_ws_sequence && !is_ws) in_ws_sequence = false;
result.back() =
absl::string_view(result.back().data(), result.back().size() + mblen);
begin += mblen;
}
}
return result;
}
std::string ByteToPiece(unsigned char c) {
return absl::StrFormat("<0x%02X>", c);
}
int PieceToByte(absl::string_view piece) {
using PieceToByteMap = absl::flat_hash_map<std::string, unsigned char>;
static const auto *const kMap = []() -> PieceToByteMap * {
auto *m = new PieceToByteMap();
for (int i = 0; i < 256; ++i) {
(*m)[ByteToPiece(i)] = i;
}
return m;
}();
const auto it = kMap->find(std::string(piece));
if (it == kMap->end()) {
return -1;
} else {
return it->second;
}
}
} // namespace sentencepiece
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