Hi Tiago,
yeah, sorry, I don't have enough to file a real bug report. This is on 2.22 (there's always a bit of lag until our high performance computing cluster team can update graph-tool). But I just thought I mention this as a warning that this machine precision bug might still be around.
Peter

On 28 March 2017 at 09:41, Tiago de Paula Peixoto <tiago@skewed.de> wrote:
Hi,

This is not very useful without the actual script and network that causes
it, otherwise I cannot try to reproduce it.

Are you using the newest version? Does it also happen with the current git
version?

Best,
Tiago

On 27.03.2017 23:25, Peter Straka wrote:
> Just thought I mention that I've reproduced this bug again on my laptop.
> Below some output, it keeps repeating at infinitum (got as far as level
> l=14021)...
> This is for just the minimize_nested_blockmodel_dl(), no layers, no weights,
> bipartite structure.
> Hope this helps,
> Peter
>
>     l=1  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=1  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=1  Bisect at B = 2 with S = 31.31709660208764
>
>     l=1  Best result: B = 2, S = 31.31709660208764
>
> level 1 : rejected replacement (2, 1) -> (2, 2) , dS: nan
>
>     l=1  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=1  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=1  Bisect at B = 2 with S = 31.31709660208764
>
>     l=1  Best result: B = 2, S = 31.31709660208764
>
> level 2 : inserted 2 , dS: nan
>
>     l=3  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=3  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=3  Bisect at B = 2 with S = 31.31709660208764
>
>     l=3  Best result: B = 2, S = 31.31709660208764
>
> level 3 : rejected replacement (2, 1) -> (2, 2) , dS: nan
>
>     l=3  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=3  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=3  Bisect at B = 2 with S = 31.31709660208764
>
>     l=3  Best result: B = 2, S = 31.31709660208764
>
> level 4 : inserted 2 , dS: nan
>
>     l=5  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=5  Current bracket: (2, 2, 2) (31.317096602087641, 31.317096602087641,
> 31.317096602087641)
>
>     l=5  Bisect at B = 2 with S = 31.31709660208764
>
>     l=5  Best result: B = 2, S = 31.31709660208764
>
>
> On Thu, 19 Jan 2017 at 08:52 Peter Straka <p.straka@unsw.edu.au
> <mailto:p.straka@unsw.edu.au>> wrote:
>
>     Great, thanks Tiago
>
>     On Wed, 18 Jan 2017 at 20:06 Tiago de Paula Peixoto <tiago@skewed.de
>     <mailto:tiago@skewed.de>> wrote:
>
>         On 18.01.2017 01:36, Peter Straka wrote:
>         > Dear list,
>         >
>         > I'm trying to fit a nested blockmodel to a (bipartite) network
>         with ~10^6
>         > edges. The algorithm minimize_nested_blockmodel_dl() doesn't
>         terminate; it
>         > keeps on adding layers indefinitely until it runs out of memory / hits
>         > walltime, see below. What could be going on?
>
>         This is a silly bug due to finite machine precision. It has already been
>         fixed in git, and will be available in the next release.
>
>         Best,
>         Tiago
>
>         --
>         Tiago de Paula Peixoto <tiago@skewed.de <mailto:tiago@skewed.de>>
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