Running the newest git version (2.23dev (commit 0b766917, Mon Mar 27 12:31:02 2017 +0100)) I now get the following screen output: minimised state /home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/overlap_blockmodel.py:253: UserWarning: unrecognized keyword arguments: ['vweight', 'eweight'] str(list(kwargs.keys()))) /home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/blockmodel.py:410: UserWarning: unrecognized keyword arguments: ['copy_bg'] str(list(kwargs.keys()))) equilibrating Traceback (most recent call last): File "model_class_selection_nested_ndc_o.py", line 44, in <module> callback=collect_marginals) File "/home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/mcmc.py", line 125, in mcmc_equilibrate delta, nmoves = state.mcmc_sweep(**mcmc_args) File "/home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/nested_blockmodel.py", line 588, in mcmc_sweep return self._h_sweep(lambda s, **a: s.mcmc_sweep(**a), c=c, **kwargs) File "/home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/nested_blockmodel.py", line 505, in _h_sweep get_entropy_args(eargs)) File "/home/pmj27/anaconda2/lib/python2.7/site-packages/graph_tool/inference/blockmodel.py", line 715, in _couple_state self._state.couple_state(state._state, entropy_args) AttributeError: 'graph_tool::OverlapBlockState<boost::adj_list<unsi' object has no attribute 'couple_state' Seeing as it ran error free for you previously I presume you can't reproduce this error either? What could we do to pinpoint it? -- View this message in context: http://main-discussion-list-for-the-graph-tool-project.982480.n3.nabble.com/... Sent from the Main discussion list for the graph-tool project mailing list archive at Nabble.com.