unique_by_key#

langchain.retrievers.ensemble.unique_by_key( iterable: Iterable[T], key: Callable[[T], H], ) → Iterator[T][source]#

Yield unique elements of an iterable based on a key function.

Parameters:

iterable (Iterable[T]) – The iterable to filter.
key (Callable[[T], H]) – A function that returns a hashable key for each element.

Yields:

Unique elements of the iterable based on the key function.

Return type:

Iterator[T]