Pyserini Release Notes (v2.2.0)

June 3, 2026 ยท View on GitHub

  • Release date: June 2, 2026
  • Anserini dependency: v2.1.1
  • Lucene dependency: v10.4.0

Summary of Changes

  • Known issues are enumerated separately.
  • Added BM25 k1 and b configuration support to the REST API and MCP server.
  • Added document truncation support to REST search results and document fetches.
  • Fixed DPR and CosDPR encoder compatibility with Transformers 5.
  • Combined and reorganized ODQA 2CR topic runs.
  • Removed deprecated CS Vault metadata URLs from prebuilt index and encoded corpus metadata.
  • Moved non-Faiss encoding tests from tests/core to tests/base and cleaned up warnings.
  • Fixed null handling for bottom_fb_docs in Python rerankers.

Contributors

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