def f1_score_least_frequent(y_true, y_pred):
    least_frequent = np.bincount(y_true).argmin()
    return f1_score(y_true, y_pred, average=None)[least_frequent]
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dataset/ETHPy150Open EducationalTestingService/skll/skll/metrics.py/f1_score_least_frequent--crossover with--dataset/ETHPy150Open fatbox/OpenSRS-py/opensrs/__init__.py/OpenSRS.domain_register