Search method

learning to rank

v1.0[1]

MERT-4 Method

• Optimize the parameter in different data source

lucene method

• different method in lucene
• lucene_multi_query

boost keyword

boost keyword before search with ITIDF

our method

different result in lucene

method	lucene	vsm_idf(haiguan)	VSM_idf(baidu)	vsm_idf(tain)	vsm_idf(calculate)
Accary	0.6628	0.6228	0.6197	0.5827	0.5426

synonyms method

• fuzzy match

• calculate the similarity value = 1/(5-5*av_value).where av_value = average(word2vec+Synonyms forest+hownet).

• lucene

• lucene4.6 already added synonyms method (org.apache.lucene.analysis.synonym[2]) like :(a -> x) (a b -> y) (b c d -> z) or extend the query.

find

• 采用最细粒度分词(对于标准问题在建立索引时，模板不用),可以提高正确率。61=>66.对于标准问题建索引时.
• 对输入的问题不应用细粒度分词（细粒度的59%，不用66%）。
• lucene4.6 已经增加了同义词拓展[3]

bug fix

• vsm method

• doesn't clear the pattern before search