mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-11-24 13:31:07 +00:00
72 lines
1.6 KiB
Python
72 lines
1.6 KiB
Python
'''
|
|
Author: https://github.com/bhushan-borole
|
|
'''
|
|
'''
|
|
The input graph for the algorithm is:
|
|
|
|
A B C
|
|
A 0 1 1
|
|
B 0 0 1
|
|
C 1 0 0
|
|
|
|
'''
|
|
|
|
graph = [[0, 1, 1],
|
|
[0, 0, 1],
|
|
[1, 0, 0]]
|
|
|
|
|
|
class Node:
|
|
def __init__(self, name):
|
|
self.name = name
|
|
self.inbound = []
|
|
self.outbound = []
|
|
|
|
def add_inbound(self, node):
|
|
self.inbound.append(node)
|
|
|
|
def add_outbound(self, node):
|
|
self.outbound.append(node)
|
|
|
|
def __repr__(self):
|
|
return 'Node {}: Inbound: {} ; Outbound: {}'.format(self.name,
|
|
self.inbound,
|
|
self.outbound)
|
|
|
|
|
|
def page_rank(nodes, limit=3, d=0.85):
|
|
ranks = {}
|
|
for node in nodes:
|
|
ranks[node.name] = 1
|
|
|
|
outbounds = {}
|
|
for node in nodes:
|
|
outbounds[node.name] = len(node.outbound)
|
|
|
|
for i in range(limit):
|
|
print("======= Iteration {} =======".format(i+1))
|
|
for j, node in enumerate(nodes):
|
|
ranks[node.name] = (1 - d) + d * sum([ ranks[ib]/outbounds[ib] for ib in node.inbound ])
|
|
print(ranks)
|
|
|
|
|
|
def main():
|
|
names = list(input('Enter Names of the Nodes: ').split())
|
|
|
|
nodes = [Node(name) for name in names]
|
|
|
|
for ri, row in enumerate(graph):
|
|
for ci, col in enumerate(row):
|
|
if col == 1:
|
|
nodes[ci].add_inbound(names[ri])
|
|
nodes[ri].add_outbound(names[ci])
|
|
|
|
print("======= Nodes =======")
|
|
for node in nodes:
|
|
print(node)
|
|
|
|
page_rank(nodes)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main() |