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Anserini: Experiments on the Washington Post (Core18)

Indexing

Typical indexing command:

nohup sh target/appassembler/bin/IndexCollection -collection \
WashingtonPostCollection -generator WapoGenerator -threads 16 -input \
/path/to/core18 -index lucene-index.core18.pos+docvectors+rawdocs \
-storePositions -storeDocvectors -storeRawDocs >& \
log.core18.pos+docvectors+rawdocs &

The directory /path/to/core18/ should be the root directory of TREC Core2018 collection, i.e., ls /path/to/core18/ should bring up a single JSON file.

For additional details, see explanation of common indexing options.

Retrieval

Topics and qrels are stored in src/main/resources/topics-and-qrels/, downloaded from NIST:

After indexing has completed, you should be able to perform retrieval as follows:

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.bm25.topics.core18.txt -bm25 &

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.bm25+rm3.topics.core18.txt -bm25 -rm3 &

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.bm25+ax.topics.core18.txt -bm25 -axiom -rerankCutoff 20 -axiom.deterministic &

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.ql.topics.core18.txt -ql &

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.ql+rm3.topics.core18.txt -ql -rm3 &

nohup target/appassembler/bin/SearchCollection -topicreader Trec -index lucene-index.core18.pos+docvectors+rawdocs -topics src/main/resources/topics-and-qrels/topics.core18.txt -output run.core18.ql+ax.topics.core18.txt -ql -axiom -rerankCutoff 20 -axiom.deterministic &

Evaluation can be performed using trec_eval:

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.bm25.topics.core18.txt

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.bm25+rm3.topics.core18.txt

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.bm25+ax.topics.core18.txt

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.ql.topics.core18.txt

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.ql+rm3.topics.core18.txt

eval/trec_eval.9.0.4/trec_eval -m map -m P.30 src/main/resources/topics-and-qrels/qrels.core18.txt run.core18.ql+ax.topics.core18.txt

Effectiveness

With the above commands, you should be able to replicate the following results:

MAP BM25 BM25+RM3 BM25+AX QL QL+RM3 QL+AX
All Topics 0.2491 0.3147 0.2921 0.2522 0.3064 0.2975
P30 BM25 BM25+RM3 BM25+AX QL QL+RM3 QL+AX
All Topics 0.3580 0.4193 0.4007 0.3627 0.4007 0.4073

Replication Log

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