Hello,
I have been running a piece of code from the cookbook on a dataset of mine.
I last ran it a year ago when it worked fine, now I however am getting error
messages. The first one is "Segmentation fault (core dumped)" which I think
is happening during a call to "state = gt.minimize_nested_blockmodel_dl(g,
deg_corr=False,overlap=True)". The other one is "terminate called after
throwing an instance of 'std::length_error'
what(): vector::_M_default_append
Aborted (core dumped)" which seems to be happening during
"gt.mcmc_equilibrate(state,force_niter=20000,
mcmc_args=dict(niter=10),callback=collect_marginals)". I am running the
latest apt-get version of graph-tool on python2 on Ubuntu 16.04. I realise
this may not be worth much without the data set (which I unfortunately can't
share) but I thought I would check whether anybody has observed similar
issue (my theory is that given it has worked in the past it might be linked
to a version update). I will see if I can get a dataset for an MWE in the
meantime.
The code I was running was:
import graph_tool.all as gt
import numpy as np
import cPickle as pickle
import timeit
g = gt.load_graph('graph_no_multi_1930.gt')
with open('model_selection_results_1930.dat','a') as output:
deg_corr = False
overlap = True
nL = 10
# Initialize the Markov chain from the "ground state"
state = gt.minimize_nested_blockmodel_dl(g,
deg_corr=deg_corr,overlap=overlap)
dl = state.entropy()
temp = "Description length: "
temp+= str(dl)
temp+='\n'
output.write(temp)
output.flush()
print 'minimised state'
bs = state.get_bs() # Get hierarchical partition.
bs += [np.zeros(1)] * (nL - len(bs)) # Augment it to L = 10 with
# single-group levels.
state = state.copy(bs=bs, sampling=True)
dls = [] # description length history
vm = [None] * len(state.get_levels()) # vertex marginals
em = None # edge marginals
def collect_marginals(s):
global vm, em
levels = s.get_levels()
vm = [sl.collect_vertex_marginals(vm[l]) for l, sl in
enumerate(levels)]
em = levels[0].collect_edge_marginals(em)
dls.append(s.entropy())
# Now we collect the marginal distributions for exactly 200,000 sweeps
print 'equilibrating'
start=timeit.default_timer()
gt.mcmc_equilibrate(state, force_niter=20000, mcmc_args=dict(niter=10),
callback=collect_marginals)
duration=timeit.default_timer()-start
print 'duration for equilibrating: ', duration
S_mf = [gt.mf_entropy(sl.g, vm[l]) for l, sl in
enumerate(state.get_levels())]
S_bethe = gt.bethe_entropy(g, em)[0]
L = -np.mean(dls)
val1 = L+sum(S_mf)
val2 = L + S_bethe + sum(S_mf[1:])
temp = "Model evidence for nested blockmodel, deg_corr = "
temp+=str(deg_corr)+', overlap = '+str(overlap)
temp+=':'+str(val1)+"(mean field),"
temp+=str(val2)+"(Bethe)"+'\n'
output.write(temp)
output.flush()
with open('raw_results.dat','w') as f:
f.write('DL: ')
f.write(str(L))
f.write('\n')
f.write('S_mf: ')
f.write(str(sum(S_mf)))
f.write('\n')
f.write('S_bethe: ')
f.write(str(S_bethe))
f.write('\n')
f.write('S_bethe + sum(S_mf[1:]): ')
f.write(str(S_bethe + sum(S_mf[1:])))
Best wishes,
Philipp
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