# Python Solution for Perceptron Learning Algorithm (Artificial Neural Networks Course) Page 9 Problem

def vecsum(a,b):
return [e1 + e2 for e1,e2 in zip(a,b)]

def scalarproduct(c,a):
return [c*e for e in a]

def dotproduct(a,b):
return sum([e1*e2 for e1,e2 in zip(a,b)])

def perceptron(w,x,b):
out = dotproduct(w,x) + b
if out == 0:
return 0
elif out > 0:
return 1
elif out < 0:
return -1

def vecequal(a,b):
return all([e1 == e2 for e1,e2 in zip(a,b)])

b = 0
w = [0,0]
x = [(-1, 1),(0, -1),(10, 1)]
y = [1,-1,1]
outputs = [perceptron(w,e,b) for e in x]
size = len(y)
turn = 0

while not vecequal(y,outputs):
print(turn,w,b)
print(y,outputs)

outputs[turn] = perceptron(w,x[turn],b)
if  outputs[turn] != y[turn]:
w = vecsum(w,scalarproduct(y[turn],x[turn]))
b = b + y[turn]

turn = (turn + 1) % size
raw_input("Press Enter to continue...")

print("CONVERGENCE REACHED!")
print(w,b)
print(y,outputs) Note by Talles Brito
2 years ago

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