Question about using `knn.radius_neighbors`

[YaokaiYang-assaultmaster]

Hi Daniel:

Thank you very much for reading this. This is not quite an issue but a question. I found you are passing a list as radius to knn.radius_neighbors function while I cannot find any documentation about it.

Doc of this function only said that it accepts a float as radius. Can you please help me to understand this code?

# find the distance of the kth in-class point
    for c in classes:
        mask = np.where(y == c)[0]
        knn.fit(x[mask, :])
        d2k[mask] = knn.kneighbors()[0][:, -1]

    # find the number of points within the distance of the kth in-class point
    knn.fit(x)
    m = knn.radius_neighbors(radius=d2k, return_distance=False)
    m = [i.shape[0] for i in m]

Thanks a lot.

[danielhomola]

http://scikit-learn.org/stable/modules/generated/sklearn.neighbors.NearestNeighbors.html#sklearn.neighbors.NearestNeighbors.radius_neighbors