acore.py 文件源码

def cartesian_product(arrays):
    """ Returns Cartesian product of given arrays (x and y): cartesian_product([x,y]) """

    broadcastable = np.ix_(*arrays)
    broadcasted = np.broadcast_arrays(*broadcastable)
    rows, cols = reduce(np.multiply, broadcasted[0].shape), len(broadcasted)
    out = np.empty(rows * cols, dtype=broadcasted[0].dtype)
    start, end = 0, rows

    for a in broadcasted:
        out[start:end] = a.reshape(-1)
        start, end = end, end + rows

    # Return value(s)
    return out.reshape(cols, rows).T