nltk.recall(reference, test)[source]

Given a set of reference values and a set of test values, return the fraction of reference values that appear in the test set. In particular, return card(reference intersection test)/card(reference). If reference is empty, then return None.

  • reference (set) – A set of reference values.
  • test (set) – A set of values to compare against the reference set.
Return type:

float or None