diff options
Diffstat (limited to 'extractor/rule_extractor_helper.h')
| -rw-r--r-- | extractor/rule_extractor_helper.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/extractor/rule_extractor_helper.h b/extractor/rule_extractor_helper.h index 7bf80c4b..bea75bc3 100644 --- a/extractor/rule_extractor_helper.h +++ b/extractor/rule_extractor_helper.h @@ -12,6 +12,9 @@ namespace extractor { class Alignment; class DataArray; +/** + * Helper class for extracting SCFG rules. + */ class RuleExtractorHelper { public: RuleExtractorHelper(shared_ptr<DataArray> source_data_array, @@ -25,18 +28,23 @@ class RuleExtractorHelper { virtual ~RuleExtractorHelper(); + // Find the alignment span for each word in the source target sentence pair. virtual void GetLinksSpans(vector<int>& source_low, vector<int>& source_high, vector<int>& target_low, vector<int>& target_high, int sentence_id) const; + // Check if one chunk (all chunks) is aligned at least in one point. virtual bool CheckAlignedTerminals(const vector<int>& matching, const vector<int>& chunklen, const vector<int>& source_low) const; + // Check if the chunks are tight. virtual bool CheckTightPhrases(const vector<int>& matching, const vector<int>& chunklen, const vector<int>& source_low) const; + // Find the target span and the reflected source span for a source phrase + // occurrence. virtual bool FindFixPoint( int source_phrase_low, int source_phrase_high, const vector<int>& source_low, const vector<int>& source_high, @@ -47,6 +55,7 @@ class RuleExtractorHelper { int max_new_x, bool allow_low_x, bool allow_high_x, bool allow_arbitrary_expansion) const; + // Find the gap spans for each nonterminal in the source phrase. virtual bool GetGaps( vector<pair<int, int> >& source_gaps, vector<pair<int, int> >& target_gaps, const vector<int>& matching, const vector<int>& chunklen, @@ -55,8 +64,10 @@ class RuleExtractorHelper { int source_phrase_low, int source_phrase_high, int source_back_low, int source_back_high, int& num_symbols, bool& met_constraints) const; + // Get the order of the nonterminals in the target phrase. virtual vector<int> GetGapOrder(const vector<pair<int, int> >& gaps) const; + // Map each terminal symbol with its position in the source phrase. virtual unordered_map<int, int> GetSourceIndexes( const vector<int>& matching, const vector<int>& chunklen, int starts_with_x) const; @@ -65,6 +76,8 @@ class RuleExtractorHelper { RuleExtractorHelper(); private: + // Find the projection of a source phrase in the target sentence. May also be + // used to find the projection of a target phrase in the source sentence. void FindProjection( int source_phrase_low, int source_phrase_high, const vector<int>& source_low, const vector<int>& source_high, |