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Anserini Regressions: TREC 2020 Deep Learning Track (Passage)

Models: BM25 with quantized weights (8 bits)

This page describes baseline experiments, integrated into Anserini's regression testing framework, on the TREC 2020 Deep Learning Track passage ranking task.

Note that the NIST relevance judgments provide far more relevant passages per topic, unlike the "sparse" judgments provided by Microsoft (these are sometimes called "dense" judgments to emphasize this contrast). For additional instructions on working with MS MARCO passage collection, refer to this page.

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.

From one of our Waterloo servers (e.g., orca), the following command will perform the complete regression, end to end:

python src/main/python/run_regression.py --index --verify --search --regression dl20-passage-bm25-b8

From any machine, the following command will download the corpus (as quantized BM25 weights) and perform the complete regression, end to end:

python src/main/python/run_regression.py --download --index --verify --search --regression dl20-passage-bm25-b8

The run_regression.py script automates the following steps, but if you want to perform each step manually, simply copy/paste from the commands below and you'll obtain the same regression results.

Corpus Download

Download the corpus and unpack into collections/:

wget https://rgw.cs.uwaterloo.ca/JIMMYLIN-bucket0/data/msmarco-passage-bm25-b8.tar -P collections/
tar xvf collections/msmarco-passage-bm25-b8.tar -C collections/

To confirm, msmarco-passage-bm25-b8.tar is 1.2 GB and has MD5 checksum 0a623e2c97ac6b7e814bf1323a97b435. With the corpus downloaded, the following command will perform the remaining steps below:

python src/main/python/run_regression.py --index --verify --search --regression dl20-passage-bm25-b8 \
  --corpus-path collections/msmarco-passage-bm25-b8

Indexing

Typical indexing command:

target/appassembler/bin/IndexCollection \
  -collection JsonVectorCollection \
  -input /path/to/msmarco-passage-bm25-b8 \
  -index indexes/lucene-index.msmarco-passage-bm25-b8/ \
  -generator DefaultLuceneDocumentGenerator \
  -threads 9 -impact -pretokenized \
  >& logs/log.msmarco-passage-bm25-b8 &

The directory /path/to/msmarco-passage-bm25-b8/ should be a directory containing jsonl files containing quantized BM25 vectors for every document

For additional details, see explanation of common indexing options.

Retrieval

Topics and qrels are stored in src/main/resources/topics-and-qrels/. The regression experiments here evaluate on the 54 topics for which NIST has provided judgments as part of the TREC 2020 Deep Learning Track. The original data can be found here.

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

target/appassembler/bin/SearchCollection \
  -index indexes/lucene-index.msmarco-passage-bm25-b8/ \
  -topics src/main/resources/topics-and-qrels/topics.dl20.txt \
  -topicreader TsvInt \
  -output runs/run.msmarco-passage-bm25-b8.bm25-b8.topics.dl20.txt \
  -impact &

Evaluation can be performed using trec_eval:

tools/eval/trec_eval.9.0.4/trec_eval -m map -c -l 2 src/main/resources/topics-and-qrels/qrels.dl20-passage.txt runs/run.msmarco-passage-bm25-b8.bm25-b8.topics.dl20.txt
tools/eval/trec_eval.9.0.4/trec_eval -m ndcg_cut.10 -c src/main/resources/topics-and-qrels/qrels.dl20-passage.txt runs/run.msmarco-passage-bm25-b8.bm25-b8.topics.dl20.txt
tools/eval/trec_eval.9.0.4/trec_eval -m recall.100 -c -l 2 src/main/resources/topics-and-qrels/qrels.dl20-passage.txt runs/run.msmarco-passage-bm25-b8.bm25-b8.topics.dl20.txt
tools/eval/trec_eval.9.0.4/trec_eval -m recall.1000 -c -l 2 src/main/resources/topics-and-qrels/qrels.dl20-passage.txt runs/run.msmarco-passage-bm25-b8.bm25-b8.topics.dl20.txt

Effectiveness

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

AP@1000 BM25 (default parameters, quantized 8 bits)
DL20 (Passage) 0.2911
nDCG@10 BM25 (default parameters, quantized 8 bits)
DL20 (Passage) 0.4852
R@100 BM25 (default parameters, quantized 8 bits)
DL20 (Passage) 0.5673
R@1000 BM25 (default parameters, quantized 8 bits)
DL20 (Passage) 0.8119

Reproduction Log*

To add to this reproduction log, modify this template and run bin/build.sh to rebuild the documentation.