Reference cycle in scipy.sparse.linalg.eigs with shift-invert mode

[lorenzovitale]

Hi,
I think I found a memory leak in scipy.sparse.linalg.eigs using shift-invert mode (setting the parameter sigma). I wrote a sample code:
https://gist.github.com/anonymous/9132942
The software versions and OS I am using are the following: Numpy 1.7.1, Scipy 0.12.1, Python 2.7, Fedora 18

[pv]

This does not seem to be a memory leak, but there does seem to be a reference cycle.
Add import gc; gc.collect() to the loop.

Python does run the gc also automatically, but not as often.

[lorenzovitale]

This solves the problem, at least for me. Thanks

[ev-br]

fixed in gh-3968, closing