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New transition systems and features for syntaxnet (#301)
* Morpher and segmenter transition systems and new features (quotes, punctuation, capitalization, character ngrams, morphology attributes).
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| /* Copyright 2016 Google Inc. All Rights Reserved. | ||
| 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. | ||
| ==============================================================================*/ | ||
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| #include "syntaxnet/binary_segment_state.h" | ||
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| #include <string> | ||
| #include "syntaxnet/segmenter_utils.h" | ||
| #include "syntaxnet/sentence.pb.h" | ||
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| namespace syntaxnet { | ||
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| ParserTransitionState *BinarySegmentState::Clone() const { | ||
| return new BinarySegmentState(); | ||
| } | ||
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| string BinarySegmentState::ToString(const ParserState &state) const { | ||
| string str("["); | ||
| for (int i = NumStarts(state) - 1; i >=0; --i) { | ||
| int start = LastStart(i, state); | ||
| int end = 0; | ||
| if (i - 1 >= 0) { | ||
| end = LastStart(i - 1, state) - 1; | ||
| } else if (state.EndOfInput()) { | ||
| end = state.sentence().token_size() - 1; | ||
| } else { | ||
| end = state.Next() - 1; | ||
| } | ||
| for (int k = start; k <= end; ++k) { | ||
| str.append(state.GetToken(k).word()); | ||
| } | ||
| if (i >= 1) str.append(" "); | ||
| } | ||
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| str.append("] "); | ||
| for (int i = state.Next(); i < state.NumTokens(); ++i) { | ||
| str.append(state.GetToken(i).word()); | ||
| } | ||
| return str; | ||
| } | ||
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| void BinarySegmentState::AddParseToDocument(const ParserState &state, | ||
| bool rewrite_root_labels, | ||
| Sentence *sentence) const { | ||
| if (sentence->token_size() == 0) return; | ||
| vector<bool> is_starts(sentence->token_size(), false); | ||
| for (int i = 0; i < NumStarts(state); ++i) { | ||
| is_starts[LastStart(i, state)] = true; | ||
| } | ||
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| // Break level of the current token is determined based on its previous token. | ||
| Token::BreakLevel break_level = Token::NO_BREAK; | ||
| bool is_first_token = true; | ||
| Sentence new_sentence; | ||
| for (int i = 0; i < sentence->token_size(); ++i) { | ||
| const Token &token = sentence->token(i); | ||
| const string &word = token.word(); | ||
| bool is_break = SegmenterUtils::IsBreakChar(word); | ||
| if (is_starts[i] || is_first_token) { | ||
| if (!is_break) { | ||
| // The current character is the first char of a new token/word. | ||
| Token *new_token = new_sentence.add_token(); | ||
| new_token->set_start(token.start()); | ||
| new_token->set_end(token.end()); | ||
| new_token->set_word(word); | ||
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| // For the first token, keep the old break level to make sure that the | ||
| // number of sentences stays unchanged. | ||
| new_token->set_break_level(break_level); | ||
| is_first_token = false; | ||
| } | ||
| } else { | ||
| // Append the character to the previous token. | ||
| if (!is_break) { | ||
| int index = new_sentence.token_size() - 1; | ||
| auto *last_token = new_sentence.mutable_token(index); | ||
| last_token->mutable_word()->append(word); | ||
| last_token->set_end(token.end()); | ||
| } | ||
| } | ||
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| // Update break level. Note we do not introduce new sentences in the | ||
| // transition system, thus anything goes beyond line break would be reduced | ||
| // to line break. | ||
| break_level = is_break ? SegmenterUtils::BreakLevel(word) : Token::NO_BREAK; | ||
| if (break_level >= Token::LINE_BREAK) break_level = Token::LINE_BREAK; | ||
| } | ||
| sentence->mutable_token()->Swap(new_sentence.mutable_token()); | ||
| } | ||
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| } // namespace syntaxnet |
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