PYTHON

apk calculate python

def apk(actual, predicted, k=10):
    """
    Computes the average precision at k.

    This function computes the average precision at k between two lists of items.

    Parameters
    ----------
    actual: list
            A list of elements that are to be predicted (order doesn't matter)
    predicted : list
            A list of predicted elements (order does matter)
    k: int, optional

    Returns
    -------
    score : double
            The average precision at k over the input lists

    """
    if len(predicted) > k:
        predicted = predicted[:k]

    score = 0.0
    num_hits = 0.0

    for i,p in enumerate(predicted):
        if p in actual and p not in predicted[:i]:
            num_hits += 1.0
            score += num_hits / (i + 1.0)

    if not actual:
        return 1.0
    if min(len(actual), k) == 0:
        return 0.0
    else:
        return score / min(len(actual), k)