regressions-backgroundlinking18.md

Anserini: Regressions for TREC 2018 Background Linking

This page describes regressions for the background linking task in the TREC 2018 News Track. The exact configurations for these regressions are stored in this YAML file. Note that this page is automatically generated from this template as part of Anserini's regression pipeline, so do not modify this page directly; modify the template instead.

Indexing

Typical indexing command:

nohup sh target/appassembler/bin/IndexCollection -collection WashingtonPostCollection \
 -input /path/to/backgroundlinking18 \
 -index indexes/lucene-index.core18.pos+docvectors+raw \
 -generator WashingtonPostGenerator \
 -threads 1 -storePositions -storeDocvectors -storeRaw \
  >& logs/log.backgroundlinking18 &

The directory /path/to/core18/ should be the root directory of the TREC Washington Post Corpus, 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:

• topics.backgroundlinking18.txt: topics for the background linking task of the TREC 2018 News Track
• qrels.backgroundlinking18.txt: qrels for the background linking task of the TREC 2018 News Track

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

nohup target/appassembler/bin/SearchCollection -index indexes/lucene-index.core18.pos+docvectors+raw \
 -topicreader BackgroundLinking -topics src/main/resources/topics-and-qrels/topics.backgroundlinking18.txt \
 -output runs/run.backgroundlinking18.bm25.topics.backgroundlinking18.txt \
 -backgroundlinking -backgroundlinking.k 100 -bm25 -hits 100 &

nohup target/appassembler/bin/SearchCollection -index indexes/lucene-index.core18.pos+docvectors+raw \
 -topicreader BackgroundLinking -topics src/main/resources/topics-and-qrels/topics.backgroundlinking18.txt \
 -output runs/run.backgroundlinking18.bm25+rm3.topics.backgroundlinking18.txt \
 -backgroundlinking -backgroundlinking.k 100 -bm25 -rm3 -hits 100 &

nohup target/appassembler/bin/SearchCollection -index indexes/lucene-index.core18.pos+docvectors+raw \
 -topicreader BackgroundLinking -topics src/main/resources/topics-and-qrels/topics.backgroundlinking18.txt \
 -output runs/run.backgroundlinking18.bm25+rm3+df.topics.backgroundlinking18.txt \
 -backgroundlinking -backgroundlinking.datefilter -backgroundlinking.k 100 -bm25 -rm3 -hits 100 &

Evaluation can be performed using trec_eval:

tools/eval/trec_eval.9.0.4/trec_eval -c -M1000 -m ndcg_cut.5 -c -M1000 -m map src/main/resources/topics-and-qrels/qrels.backgroundlinking18.txt runs/run.backgroundlinking18.bm25.topics.backgroundlinking18.txt

tools/eval/trec_eval.9.0.4/trec_eval -c -M1000 -m ndcg_cut.5 -c -M1000 -m map src/main/resources/topics-and-qrels/qrels.backgroundlinking18.txt runs/run.backgroundlinking18.bm25+rm3.topics.backgroundlinking18.txt

tools/eval/trec_eval.9.0.4/trec_eval -c -M1000 -m ndcg_cut.5 -c -M1000 -m map src/main/resources/topics-and-qrels/qrels.backgroundlinking18.txt runs/run.backgroundlinking18.bm25+rm3+df.topics.backgroundlinking18.txt

Effectiveness

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

NCDG@5	BM25	+RM3	+RM3+DF
TREC 2018 Topics	0.3293	0.3526	0.4171

AP	BM25	+RM3	+RM3+DF
TREC 2018 Topics	0.2490	0.2642	0.2692