def greedy_local_heuristic(sccs,degree_dict,queue):
edges_to_be_removed = []
while True:
graph = sccs.pop()
temp_nodes_degree_dict = {}
for node in graph.nodes():
temp_nodes_degree_dict[node] = degree_dict[node][0]
from helper_funs import pick_from_dict
max_node,_ = pick_from_dict(temp_nodes_degree_dict)
max_value = degree_dict[max_node]
#degrees = [(node,degree_dict[node]) for node in list(graph.nodes())]
#max_node,max_value = max(degrees,key = lambda x: x[1][0])
if max_value[1] == "in":
# indegree > outdegree, remove out-edges
edges = [(max_node,o) for o in graph.neighbors(max_node)]
else:
# outdegree > indegree, remove in-edges
edges = [(i,max_node) for i in graph.predecessors(max_node)]
edges_to_be_removed += edges
sub_graphs = filter_big_scc(graph,edges_to_be_removed)
if sub_graphs:
for index,sub in enumerate(sub_graphs):
sccs.append(sub)
if not sccs:
break
queue.put(edges_to_be_removed)
def remove_cycle_edges_by_agony(graph, players, edges_to_be_removed):
pair_agony_dict = {}
for pair in graph.edges():
u, v = pair
agony = max(players[u] - players[v], 0)
pair_agony_dict[pair] = agony
from helper_funs import pick_from_dict
pair_max_agony, agony = pick_from_dict(pair_agony_dict)
edges_to_be_removed.append(pair_max_agony)
# print("edge to be removed: %s, agony: %0.4f" % (pair_max_agony,max_agony))
sub_graphs = filter_big_scc(graph, [pair_max_agony])
if sub_graphs:
num_subs = len(sub_graphs)
for index, sub in enumerate(sub_graphs):
# print("%d / %d scc: (%d,%d)" % (index+1,num_subs,sub.number_of_nodes(),sub.number_of_edges()))
remove_cycle_edges_by_agony(sub, players, edges_to_be_removed)
else:
return None
def remove_cycle_edges_by_ranking_score_iterately(sccs, players,
edges_to_be_removed,
is_Forward):
while True:
graph = sccs.pop()
node_scores_dict = {}
for node in graph.nodes_iter():
node_scores_dict[node] = players[node]
from helper_funs import pick_from_dict
max_k, max_v, min_k, min_v = pick_from_dict(node_scores_dict, "both")
#node_scores = [(node,players[node]) for node in graph.nodes_iter()]
#sorted_node_scores = sorted(node_scores,key = lambda x: x[1])
if is_Forward:
node, score = max_k, max_v
target_edges = [(node, v) for v in graph.successors_iter(node)]
#target_edges = [(v,node) for v in graph.predecessors_iter(node)]
else:
node, score = min_k, min_v
#node,score = sorted_node_scores.pop()
target_edges = [(v, node) for v in graph.predecessors_iter(node)]
'''
from remove_cycle_edges_by_agony import get_agonies
pair_agony_dict = get_agonies(target_edges,players)
from helper_funs import pick_from_dict
pair_max_agony,agony = pick_from_dict(pair_agony_dict)
print("edge with max agony: %s, max agony: %0.4f" % (pair_max_agony,agony))
target_edges = [pair_max_agony]
'''
edges_to_be_removed += target_edges
graph.remove_edges_from(target_edges)
sub_graphs = filter_big_scc(graph, target_edges)
if sub_graphs:
sccs += sub_graphs
if not sccs:
return
