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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def shifted_centroid_distance(item_a, time_a, item_b, time_b, max_value):
 """ Centroid distance with motion corrections. Args: item_a: STObject from the first set in ObjectMatcher time_a: Time integer being evaluated item_b: STObject from the second set in ObjectMatcher time_b: Time integer being evaluated max_value: Maximum distance value used as scaling value and upper constraint. Returns: Distance value between 0 and 1. """

    ax, ay = item_a.center_of_mass(time_a)
    bx, by = item_b.center_of_mass(time_b)
    if time_a < time_b:
        bx = bx - item_b.u
        by = by - item_b.v
    else:
        ax = ax - item_a.u
        ay = ay - item_a.v
    return np.minimum(np.sqrt((ax - bx) ** 2 + (ay - by) ** 2), max_value) / float(max_value)