bninput.py
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from pgmpy.readwrite import BIFReader
import networkx as nx
import pydot
from networkx.drawing.nx_pydot import graphviz_layout
def summary_dag(filename):
file = BIFReader(filename)
model = file.get_model() # Cria um objeto BayesianModel
nodes = model.nodes()
asc = 0
des = 0
nodes_in = 0
nodes_out = 0
for x in nodes:
# Obtem os nós pais e filhos de cada nós
parents = model.get_parents(x)
children = model.get_children(x)
if len(parents) != 0:
des += 1
if len(children) != 0:
asc += 1
nodes_in += len(children)
nodes_out += len(parents)
return {
'dag_file': filename,
'nodes': nodes,
'count_parents': des,
'count_children': asc,
'count_in_edges': nodes_in,
'count_out_edges': nodes_out,
'bnmodel': model
}
def summary_str(d):
s = "DAG file: " + d["dag_file"] + "\n"
s += " Number of nodes: " + str(len(d["nodes"])) + "\n"
s += " Number of parents: " + str(d["count_parents"]) + "\n"
s += " Number of children: " + str(d["count_children"]) + "\n"
s += " Average in-degree: " + str(d["count_in_edges"]/len(d["nodes"])) + "\n"
s += " Average out-degree: " + str(d["count_out_edges"]/len(d["nodes"])) + "\n"
s += " Nodes:" + "\n"
nodes = d["nodes"]
for x in nodes:
s += " " + str(x) + "\n"
return s
def show_dag(model):
G = nx.DiGraph()
dot = pydot.Dot(graph_type='digraph')
for node in model['nodes']:
G.add_node(node)
dot.add_node(pydot.Node(node))
for edge in model['bnmodel'].edges:
G.add_edge(edge[0], edge[1])
dot.add_edge(pydot.Edge(edge[0], edge[1]))
# objeto pydot
# defina o layout do grafo
pos = graphviz_layout(G, prog='dot')
# desenhe o grafo usando o networkx
nx.draw(G, pos, with_labels=True)
def save_dag(model, target_filename):
G = nx.DiGraph()
for node in model.nodes:
G.add_node(node)
for edge in model.edges:
G.add_edge(edge[0], edge[1])
# objeto pydot
dot = pydot.Dot(graph_type='digraph')
for node in model.nodes:
dot.add_node(pydot.Node(node))
for edge in model.edges:
dot.add_edge(pydot.Edge(edge[0], edge[1]))
# defina o layout do grafo
pos = graphviz_layout(G, prog='dot')
# renderize o grafo com o pydot
graph = pydot.graph_from_dot_data(dot.to_string())[0]
graph.write_png(target_filename)
if __name__ == "__main__":
summary = summary_dag("asia2.bif")
message = summary_str(summary)
print(message)