题目内容
Focused crawler or topical crawler is such a crawler to download pages similar to each other.
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The anchor text of a link is an instruction to it.
Web Search Engines can analyze anchor text from hyperlinks on Web pages.
If the visited pages are similar to the driving query, the crawler will copy them.
A crawler is not able to infer the similarity between the driving query and the pages to visit according to the pages already visited.
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