Compute the set precision (SPR).
score : float
The SPR for reference and test set.
See also
lingpy.test.evaluate.EvalLXS.set_recall, lingpy.test.evaluate.EvalLXS.set_fscore
Notes
The set precision (see Bergsma2007) is defined as the number of identical cognate sets in reference and test set divided by the total number of cognate sets in the test set.
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