BlockState: Remove instance counting

src/graph_tool/community/blockmodel.py

@@ -92,12 +92,9 @@ class BlockState(object):
         memory,
     """
 
-    _state_ref_count = 0
-
     def __init__(self, g, eweight=None, vweight=None, b=None,
                  B=None, clabel=None, deg_corr=True,
                  max_BE=1000, **kwargs):
-        BlockState._state_ref_count += 1
 
         # initialize weights to unity, if necessary
         if eweight is None:

src/graph_tool/community/covariate_blockmodel.py

@@ -85,9 +85,6 @@ class CovariateBlockState(BlockState):
     def __init__(self, g, ec, eweight=None, vweight=None, b=None, B=None,
                  clabel=None, layers=False, deg_corr=True, overlap=False,
                  **kwargs):
-
-        BlockState._state_ref_count += 1
-
         self.g = g
 
         if kwargs.get("ec_done", False):

src/graph_tool/community/overlap_blockmodel.py

@@ -75,8 +75,6 @@ class OverlapBlockState(BlockState):
     def __init__(self, g, b=None, B=None, clabel=None, deg_corr=True,
                  max_BE=1000, **kwargs):
 
-        BlockState._state_ref_count += 1
-
         # determine if there is a base graph, and overlapping structure
         self.base_g = kwargs.get("base_g", None)