A side project I have been working on a little since last winter and which explores extending duckdb with mlpack is now public at the duckdb-mlpack repo.
duckdb is an excellent ‘small’ (as in ‘runs as a self-contained binary’) database engine with both a focus on analytical payloads (OLAP rather than OLTP) and an impressive number of already bolted-on extensions (for example for cloud data access) delivered as a single-build C++ …