lenskit.data.ItemListCollector

class lenskit.data.ItemListCollector(*args, **kwargs)

Bases: Protocol

Collect item lists with associated keys, as in ItemListCollection.

__init__(*args, **kwargs)

Methods

__init__(*args, **kwargs)
add(list, *fields, **kwfields)	Add a single item list to this list.
add_from(other, **fields)	Add all collection from another collection to this collection.

abstract add(list, *fields, **kwfields)

Add a single item list to this list.

Parameters:

• list (ItemList) – The item list to add.

• fields (int | str | bytes | integer[Any] | str_ | bytes_ | object_) – The key fields for this list.

• kwfields (int | str | bytes | integer[Any] | str_ | bytes_ | object_) – The key fields for this list.

abstract add_from(other, **fields)

Add all collection from another collection to this collection. If field values are supplied, they are used to supplement or overwrite the keys in other; a common use case is to add results from multiple recommendation runs and save them a single field.

Parameters:

• other (ItemListCollection) – The item list collection to incorporate into this one.

• fields (int | str | bytes | integer[Any] | str_ | bytes_ | object_) – Additional key fields (must be specified by name).