作者: Hao Zheng , Jian Hu
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摘要: Embodiments employ knowledge from network searches to enrich features useable describe an advertisement. Advertisement content may be segmented generate key phrases that are rank ordered based on a phrase's pointwise mutual information value with Ad keywords and term frequency-inverse document frequency (TF-IDF) scores. These employed plurality of query performed search result snippets. The snippets then analyzed ranked identify expansion having TF-IDF over given threshold. A subset these combined the used rebuild index for When is delivered client device, compared select advertisement provided device.