19. The method recited in claim 18 , wherein: each first web page of the plurality of first web pages is of a known high quality; each second web page of the plurality of second web pages is of a known low quality; each first web page of the plurality of first web pages and the third web page are directly or indirectly linked via at least one first hyperlinks; and each second web page of the plurality of second web pages and the third web page are directly or indirectly linked via at least one second hyperlinks.
19. The method recited in claim 18 , wherein: each first web page of the plurality of first web pages is of a known high quality; each second web page of the plurality of second web pages is of a known low quality; each first web page of the plurality of first web pages and the third web page are directly or indirectly linked via at least one first hyperlinks; and each second web page of the plurality of second web pages and the third web page are directly or indirectly linked via at least one second hyperlinks. 20. The method recited in claim 19 , further comprising: representing the text of the local web page information of the plurality of first web pages, the plurality of second web pages, and the third web page using at least one dimensional vector of words; and representing the hyperlink relationships of the global web graph information about the plurality of first web pages, the plurality of second web pages, and the third web page using a graph that comprises a plurality of nodes and a plurality of edges, wherein each node of the graph represents one of the web pages, and each edge of the graph connects two of the nodes where the corresponding two web pages are linked.