add third sorting critera

deconvolution/d2graph/path_optimization.py

@@ -65,7 +65,8 @@ class Optimizer:
             def node_sorting_value(node):
                 u = opt.d2g.node_by_idx[int(node)]
                 return (0 if len(Counter(opt.d2g.get_covering_variable_node(int(node))) - coverage) == 0 else 1,
-                        - u.get_link_divergence())
+                        - u.get_link_divergence(),
+                        self.d2g[str(u.idx)][str(current_node)]["distance"])
             neighbors.sort(key=node_sorting_value)
             stack.append(neighbors)