"""Optional three-round detector-pattern refinement of a retained decoder."""
import numpy as np
from r3_pattern_model import predict


def refine(package, record, packed, probabilities):
    settings = record.get('r3_pattern')
    if settings is None:
        return probabilities
    with np.load(package/settings['weights'], allow_pickle=False) as saved:
        state = {k: saved[k] for k in saved.files}
    return predict(packed, state, probabilities, mode=settings['mode'])