Added

• Embedders in the LLM xpack now have method get_embedding_dimension that returns number of dimension used by the chosen embedder.
• pathway.stdlib.indexing.nearest_neighbors, with implementations of pathway.stdlib.indexing.data_index.InnerIndex based on k-NN via LSH (implemented in Pathway), and k-NN provided by USearch library.
• pathway.stdlib.indexing.vector_document_index, with a few predefined instances of pathway.stdlib.indexing.data_index.DataIndex.
• pathway.stdlib.indexing.bm25, with implementations of pathway.stdlib.indexing.data_index.InnerIndex based on BM25 index provided by Tantivy.
• pathway.stdlib.indexing.full_text_document_index, with a predefined instance of pathway.stdlib.indexing.data_index.DataIndex.
• Introduced the reranker module under llm.xpacks. Includes few re-ranking strategies and utility functions for RAG applications.

Changed

• BREAKING: windowby generates IDs of produced rows differently than in the previous version.
• BREAKING: pw.io.csv.write prints printable non-ascii characters as regular text, not \u{xxxx}.
• BREAKING: Connector methods pw.io.elasticsearch.read, pw.io.debezium.read, pw.io.fs.read, pw.io.jsonlines.read, pw.io.kafka.read, pw.io.python.read, pw.io.redpanda.read, pw.io.s3.read now check the type of the input data. Previously it was not checked if the provided format was "json"/"jsonlines". If the data is inconsistent with the provided schema, the row is skipped and the error message is emitted.
• BREAKING: query and query_as_of_now methods of pathway.stdlib.indexing.data_index.DataIndex now return pathway.JoinResult, to allow resolving column name conflicts (between columns in the table with queries and table with index data).
• BREAKING: DataIndex methods query and query_as_of_now now return score in a column named _pw_index_reply_score (defined as _SCORE variable in pathway.stdlib.indexing.colnames.py).

Removed

• BREAKING: pathway.stdlib.indexing.data_index.VectorDocumentIndex class, some predefined instances are now meant to be obtained via methods provided in pathway.stdlib.indexing.vector_document_index.
• BREAKING: with_distances parameter of query and query_as_of_now methods in pathway.stdlib.indexing.data_index.DataIndex. Instead of 'distance', we now operate with a more general term 'score' (higher = better). For distance based indices score is usually defined as negative distance. Score is now always included in the answer, as long as underlying index returns something that indicates quality of a match.