I'm having a hard time when using BallTree.query_radius.
Consider the following example:
points = np.random.random((10,3))
bt = BallTree(X)
idxs = bt.query_radius((0.0,0.0,0.0), r=1)
The strange thing is that idxs is of dtype "object". I thus can't use it
in the way I'd normally use it if it were an integer array. I can't do
idxs.ravel() to get a flat list of the indices. idxs.shape returns (1,),
which is awkward. If I run `idxs.astype("u8") I get an error (ValueError:
setting an array element with a sequence.).
It's especially awkward because this is all different from the index array
I get when I run BallTree.query(...).
Is this behavior intended? Can it be improved? How can I convert the
array of dtype "object" into an integer array?
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