Pyserini Release Notes (v0.9.3.0)

Release date: May 27, 2020

• Implemented pseudo-relevance classifier reranking technique.
• Added TfidfVectorizer to obtain vector representations of arbitrary documents from index. Verified that class works as expected by replicating classification demo on 20 Newsgroups with scikit-learn.
• Added bindings to TREC COVID round 3 topics.
• Added script for CORD-19 length outlier detection.
• Added __main__ to pyserini.search to perform TREC runs from the command line.
• Fixed issues with computing BM25 term weights and query-document scores.
• Exposed access to basic index statistics in IndexReaderUtils.

Contributors (This Release)

Sorted by number of commits:

• Johnson Han (x65han)
• Jimmy Lin (lintool)
• Yuqi Liu (yuki617)
• Pepijn Boers (PepijnBoers)
• Tim Hatch (thatch)
• Stephanie Hu (stephaniewhoo)

All Contributors

Sorted by number of commits, according to GitHub:

• Jimmy Lin (lintool)
• Johnson Han (x65han)
• Zeynep Akkalyoncu Yilmaz (zeynepakkalyoncu)
• Yuqi Liu (yuki617)
• Chris Kamphuis (Chriskamphuis)
• Tommaso Teofili (tteofili)
• Pepijn Boers (PepijnBoers)
• Stephanie Hu (stephaniewhoo)
• Tim Hatch (thatch)
• Rodrigo Nogueira (rodrigonogueira4)
• Alireza Mirzaeiyan (amirzaeiyan)