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Hi, I cannot get the example code for minimize_nested_blockmodel to run. I get the same error for other networks, too. Perhaps there is a bug?

Ubuntu Python 2.7.5+ (default, Feb 27 2014, 19:37:08)

In [1]: import graph_tool.all as gt

In [4]: g = gt.collection.data["power"]

In [5]: bstack, mdl = gt.minimize_nested_blockmodel_dl(g, deg_corr=True)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-5-a99a59d4780e> in <module>()
----> 1 bstack, mdl = gt.minimize_nested_blockmodel_dl(g, deg_corr=True)

/usr/lib/python2.7/dist-packages/graph_tool/community/nested_blockmodel.pyc in minimize_nested_blockmodel_dl(g, Bs, bs, deg_corr, dense, eweight, vweight, nsweeps, epsilon, c, nmerge_sweeps, r, sparse_thresh, se\
quential, verbose, checkpoint, minimize_state)
   1045                                   sparse_thresh=sparse_thresh,
   1046                                   checkpoint=checkpoint,
-> 1047                                   minimize_state=minimize_state)
   1048     else:
   1049         state = NestedBlockState(g, bs=bs, deg_corr=deg_corr, eweight=eweight,

/usr/lib/python2.7/dist-packages/graph_tool/community/nested_blockmodel.pyc in init_nested_state(g, Bs, deg_corr, dense, eweight, vweight, nsweeps, epsilon, r, nmerge_sweeps, c, sequential, sparse_thresh, checkp\
oint, minimize_state, max_BE, verbose)
    844         ecount = state.levels[l].mrs
    845
--> 846     minimize_state.clear()
    847     mstate.sync(state)
    848     if checkpoint is not None:

/usr/lib/python2.7/dist-packages/graph_tool/community/nested_blockmodel.pyc in clear(self)
    437         self.minimize_state.clear()
    438         self.l = -1
--> 439         self.bs.clear()
    440         self.done.clear()
    441

AttributeError: 'list' object has no attribute 'clear'