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83 lines
2.3 KiB
83 lines
2.3 KiB
// Copyright (c) 2021 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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#ifndef PATH_TRIE_H
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#define PATH_TRIE_H
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#include <algorithm>
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#include <limits>
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#include <memory>
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#include <utility>
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#include <vector>
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#include "fst/fstlib.h"
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/* Trie tree for prefix storing and manipulating, with a dictionary in
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* finite-state transducer for spelling correction.
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*/
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class PathTrie {
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public:
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PathTrie();
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~PathTrie();
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// get new prefix after appending new char
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PathTrie* get_path_trie(int new_char, bool reset = true);
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// get the prefix in index from root to current node
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PathTrie* get_path_vec(std::vector<int>& output);
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// get the prefix in index from some stop node to current nodel
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PathTrie* get_path_vec(
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std::vector<int>& output,
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int stop,
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size_t max_steps = std::numeric_limits<size_t>::max());
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// update log probs
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void iterate_to_vec(std::vector<PathTrie*>& output);
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// set dictionary for FST
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void set_dictionary(fst::StdVectorFst* dictionary);
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void set_matcher(std::shared_ptr<fst::SortedMatcher<fst::StdVectorFst>>);
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bool is_empty() { return ROOT_ == character; }
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// remove current path from root
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void remove();
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float log_prob_b_prev;
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float log_prob_nb_prev;
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float log_prob_b_cur;
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float log_prob_nb_cur;
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float score;
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float approx_ctc;
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int character;
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PathTrie* parent;
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private:
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int ROOT_;
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bool exists_;
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bool has_dictionary_;
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std::vector<std::pair<int, PathTrie*>> children_;
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// pointer to dictionary of FST
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fst::StdVectorFst* dictionary_;
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fst::StdVectorFst::StateId dictionary_state_;
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// true if finding ars in FST
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std::shared_ptr<fst::SortedMatcher<fst::StdVectorFst>> matcher_;
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};
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#endif // PATH_TRIE_H
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