lenskit.metrics.RankingMetricBase

class lenskit.metrics.RankingMetricBase(k=None)

Bases: Metric

Base class for most ranking metrics, implementing a k parameter for truncation.

Parameters:

k (int | None) – Specify the length cutoff for rankings. Rankings longer than this will be truncated prior to measurement.

Stability:

Caller (see Stability Levels).

__init__(k=None)

Parameters:

k (int | None)

Methods

__init__([k])
extract_list_metrics(data, /)	Extract per-list metric(s) from intermediate measurement data.
measure_list(output, test, /)	Compute measurements for a single list.
summarize(values, /)	Aggregate intermediate values into summary statistics.
truncate(items)	Truncate an item list if it is longer than k.

Attributes

k	The maximum length of rankings to consider.
label	Default name — class name, optionally @K.

k: int | None = None

The maximum length of rankings to consider.

property label

Default name — class name, optionally @K.

truncate(items)

Truncate an item list if it is longer than k.

Parameters:

items (ItemList)