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sf_crime_13.py
X_train, y_train = to.train.xs, to.train.ys.values.ravel()
X_validation, y_validation = to.valid.xs, to.valid.ys.values.ravel()
mask_positive_class = (y_validation == 1)
print(f"The train set has {np.bincount(y_train)[1]} positive labels.")
print(f"The validation set has {np.bincount(y_validation)[1]} positive labels.")
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