fix np array np.int64 conversion for python3

Author: wweir827

src/VertexPartition.py

@@ -2,6 +2,7 @@
 from . import _c_louvain
 from .functions import _get_py_capsule
 import sys
+import numpy as np
 # Check if working with Python 3
 PY3 = (sys.version > '3')
 
@@ -849,8 +850,15 @@ def __init__(self, graph, layer_vec=None, initial_membership=None, weights=None,
       else:
         # Make sure it is a list
         weights = list(weights)
+
+
     if layer_vec is not  None:
-      layer_vec = list(layer_vec)  # ensure that it is a list
+      layer_vec=np.array(layer_vec).tolist()
+      # if isinstance(layer_vec, np.ndarray):
+      #   layer_vec = layer_vec.tolist()
+      # elif layer_vec is not None:
+      #   layer_vec = list(layer_vec)
+
     else:
       layer_vec = [0 for _ in range(graph.vcount())] #default is to assume single layer