What's Changed

• Simplify eval arg names by @hinthornw in https://github.com/hwchase17/langchain/pull/6944
• Arthur Callback by @hinthornw in https://github.com/hwchase17/langchain/pull/6972
• Promptlayer Callback by @hinthornw in https://github.com/hwchase17/langchain/pull/6975
• Page per class-style api reference by @dev2049 in https://github.com/hwchase17/langchain/pull/6560
• Rm pytz dep by @baskaryan in https://github.com/hwchase17/langchain/pull/6978
• Beef up import test by @baskaryan in https://github.com/hwchase17/langchain/pull/6979
• Add Flyte Callback Handler (#6139) by @hinthornw in https://github.com/hwchase17/langchain/pull/6986
• Zep Authentication by @danielchalef in https://github.com/hwchase17/langchain/pull/6728
• Remove Promptlayer Notebook by @hinthornw in https://github.com/hwchase17/langchain/pull/6996
• Add New Retriever Interface with Callbacks by @vowelparrot in https://github.com/hwchase17/langchain/pull/5962
• Fix: Correct typo by @waveFrontSet in https://github.com/hwchase17/langchain/pull/6988
• Fix typo in quickstart.mdx by @mfosterw in https://github.com/hwchase17/langchain/pull/6985
• feat: enable UnstructuredEmailLoader to process attachments by @MthwRobinson in https://github.com/hwchase17/langchain/pull/6977
• Improve docstrings for langchain.schema.py by @dev2049 in https://github.com/hwchase17/langchain/pull/6802
• Harrison/split schema dir by @hwchase17 in https://github.com/hwchase17/langchain/pull/7025
• Second Attempt - Add concurrent insertion of vector rows in the Cassandra Vector Store by @hemidactylus in https://github.com/hwchase17/langchain/pull/7017
• Log Errors in Evaluator Callback by @hinthornw in https://github.com/hwchase17/langchain/pull/7031
• Accept no 'reasoning' response in qa evaluator by @hinthornw in https://github.com/hwchase17/langchain/pull/7030
• Fix docs by @alexiri in https://github.com/hwchase17/langchain/pull/7028
• Fix typo by @izeye in https://github.com/hwchase17/langchain/pull/7023
• Support params on GoogleSearchApiWrapper (#6810) by @skspark in https://github.com/hwchase17/langchain/pull/7014
• Polish reference docs by @izeye in https://github.com/hwchase17/langchain/pull/7045
• Rm retriever kwargs by @baskaryan in https://github.com/hwchase17/langchain/pull/7013
• bump 221 by @baskaryan in https://github.com/hwchase17/langchain/pull/7047

New Contributors

• @waveFrontSet made their first contribution in https://github.com/hwchase17/langchain/pull/6988
• @mfosterw made their first contribution in https://github.com/hwchase17/langchain/pull/6985
• @skspark made their first contribution in https://github.com/hwchase17/langchain/pull/7014

Full Changelog: https://github.com/hwchase17/langchain/compare/v0.0.220...v0.0.221