def compute_edges():
""" actions performed by the environment
Alzeihmer desease:
select randomly a certain percentage of edges.
The weights of the edges will be reduced
of a certain percentage
"""
num_edges_selected = int(math.ceil(gi.num_edges() * config.frac_edges ))
selected=gi.random_edges(num_edges_selected)
damaged = set()
thisdamage=[]
for e in selected: # each of these edges will be assigned a damage
prev_weight = gi.get_weight(e)
gi.mult_weight(e, config.frac_damage)
diff = prev_weight - e.weight
e.damage = diff # if the edge is too light, destroy it
thisdamage.append((e.source, e.target, e.damage))
if gi.get_weight(e) < 1.0: #del e # FIXME!! careful!!!
pass
damaged.add(e)
return damaged
def termination_condition3():
if gi.num_edges() <= 0:
return True
return False