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Closed
Opened by Tim Day@timday

minimize_blockmodel_dl crashes with parallel=True (64bit Debian jessie, python3 and 2)

I was messing around with graph_tool.community.minimize_blockmodel_dl ... works great, until I add a ,parallel=True to the call parameters, at which point I start getting a

*** Error in `python3': double free or corruption (!prev): 0x0000000004ff9090 ***
Aborted

I'm on Debian Jessie (64bit) using the packages from http://downloads.skewed.de/apt/jessie. Machine is a quad core i7 (8 if you count hyperthreading). I've tried both python2 and python3 versions; both have the same issue.

Attached file imagenet.py reproduces the issue standalone (only dependencies besides graph_tool are scipy and PIL I think). I admit my application is a little perverse... an attempt to see what happens when this algorithm is applied to graphs of image pixels and properties; for the curious, the output when run serially (90 seconds on my old i7) is:

mix-final