def query(self, q, op='and'):
""" Query and rank the results. Calculate the scores according to
both factors of the content rank and page rank.
Note: In this function, calculate the content rank scores in the real time
and only get the page rank scores which are preloaded in the database. """
db = self.config.indexdb
sort = int(self.config.sort)
cr_fac = float(self.config.rankers['content'])
pr_fac = float(self.config.rankers['page'])
query = SimpleQuery(db)
words = query.parse_query(q)
urls = query.query(q)
if len(urls) == 0:
return []
scores = {}
valid_fac = {}
valid_score = {}
if cr_fac > 0:
cr = ContentRanker(db, sort)
cr_scores = cr.score(urls, words)
cr_scores = normalize(cr_scores)
valid_fac['content'] = cr_fac
valid_score['content'] = cr_scores
if pr_fac > 0:
pr = PageRanker(db, sort)
pr_scores = pr.score(urls, words)
pr_scores = normalize(pr_scores)
valid_fac['page'] = pr_fac
valid_score['page'] = pr_scores
for urlid in urls:
scores[urlid] = 0.0
try:
for key in valid_fac.keys():
scores[urlid] += valid_fac[key]*valid_score[key][urlid]
except:
ferrmsg("Error: urlid(%s) is not find in the results of each rank." % urlid, \
'SECore')
res = sorted(scores.items(), key=lambda v:v[1], reverse=sort)
res = [t[0] for t in res]
return res
def index(self): """ Index the got pages, include two steps: 1, index the pages for all page information. 2, pageranke the page and also store the scores to accelerate the query process.""" idb = self.config.indexdb odb = self.config.oridb sort = int(self.config.sort) indexer = Indexer(idb) indexer.index(odb) del indexer pr = PageRanker(idb, sort) pr.build_links(odb) pr.pagerank() del pr
