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experiments-clueweb12-b13.md

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Anserini Experiments on ClueWeb12-B13

Indexing:

nohup sh target/appassembler/bin/IndexCollection -collection CW12Collection \
 -input /path/to/cw12-b13/ -generator JsoupGenerator \
 -index lucene-index.cw12b13.pos+docvectors -threads 32 -positions -docvectors -optimize \
 > log.cw12b13.pos+docvectors &

The directory /path/to/cw12-b13/ should be the root directory of ClueWeb12-B13 collection, i.e., /path/to/cw12-b13/ should bring up a bunch of subdirectories, ClueWeb12_00 to ClueWeb12_18. The above command builds an index that stores term positions (-positions) as well as doc vectors for relevance feedback (-docvectors), and -optimize force merges all index segment into one.

After indexing is done, you should be able to perform a retrieval run:

sh target/appassembler/bin/SearchWebCollection \
  -topicreader Webxml -index lucene-index.cw12b13.pos+docvectors -bm25 \
  -topics src/main/resources/topics-and-qrels/topics.web.201-250.txt -output run.web.201-250.bm25.txt

For the retrieval model: specify -bm25 to use BM25, -ql to use query likelihood, and add -rm3 to invoke the RM3 relevance feedback model (requires docvectors index).

Topics and qrels are stored in src/main/resources/topics-and-qrels/. Use trec_eval to compute AP and P30, and use gdeval to compute NDCG@20:

eval/trec_eval.9.0/trec_eval src/main/resources/topics-and-qrels/qrels.web.201-250.txt run.web.201-250.bm25.txt
eval/gdeval.pl src/main/resources/topics-and-qrels/qrels.web.201-250.txt run.web.201-250.bm25.txt

You should be able to replicate the following results:

AP BM25 BM25+RM3 QL QL+RM3
TREC 2013 Web Track: Topics 201-250 0.0458 0.0428 0.0390 0.0321
TREC 2014 Web Track: Topics 251-300 0.0220 0.0189 0.0230 0.0202
P30 BM25 BM25+RM3 QL QL+RM3
TREC 2013 Web Track: Topics 201-250 0.2000 0.1753 0.1720 0.1447
TREC 2014 Web Track: Topics 251-300 0.1307 0.1140 0.1327 0.1180
NDCG@20 BM25 BM25+RM3 QL QL+RM3
TREC 2013 Web Track: Topics 201-250 0.1242 0.1110 0.1159 0.0876
TREC 2014 Web Track: Topics 251-300 0.1190 0.1016 0.1159 0.0987