Splink is an open-source Python library designed for high-speed, probabilistic record linkage and data deduplication across various SQL backends like DuckDB, Spark, and Athena. Developed by the Ministry of Justice, it utilizes the Fellegi-Sunter model to identify and cluster matching records in large datasets without requiring unique identifiers or extensive training data. The provided documentation highlights Splink’s ability to scale to hundreds of millions of records while offering interactive visualizations for model diagnostics. Case studies from the UK government illustrate how the tool is productionized using modular pipelines and automated workflows to ensure consistency and auditability. These sources emphasize a design philosophy rooted in idempotency and observability, allowing organizations to manage complex entity resolution tasks reliably. Ultimately, the software serves as a versatile framework for data scientists to resolve identities and link disparate information systems efficiently.

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