def classify(y_true, y_pred):
lb = LabelBinarizer()
y_true_combined = lb.fit_transform(list(chain.from_iterable(y_true)))
y_pred_combined = lb.transform(list(chain.from_iterable(y_pred)))
tagset = set(lb.classes_) - {'O'}
tagset = sorted(tagset, key=lambda tag: tag.split('-', 1)[::-1])
class_indices = {cls: idx for idx, cls in enumerate(lb.classes_)}
return classification_report(
y_true_combined,
y_pred_combined,
labels = [class_indices[cls] for cls in tagset],
target_names = tagset,
)
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