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Adds recall@k metric to rank eval API #52577

Merged
merged 2 commits into from
Feb 27, 2020
Merged

Adds recall@k metric to rank eval API #52577

merged 2 commits into from
Feb 27, 2020

Commits on Feb 26, 2020

  1. Adds recall@k metric to rank eval API 

    This change adds the recall@k metric and refactors precision@k to match
the new metric.

Recall@k is an important metric to use for learning to rank (LTR)
use-cases. Candidate generation or first ranking phase ranking functions
are often optimized for high recall, in order to generate as many
relevant candidates in the top-k as possible for a second phase of
ranking. Adding this metric allows tuning that base query for LTR.

See: #51676
    @joshdevins
    joshdevins committed Feb 26, 2020
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  2. Fixes a docs typo from copy-paste

    @joshdevins
    joshdevins committed Feb 26, 2020
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