Perceptron Code

I used two different codes to make the perceptron. The first is from this blog post and the second is from some work I did with Stephanie Koulton.

import numpy as np

X = np.array([
    [-2,4,-1],
    [4,1,-1],
    [1, 6, -1],
    [2, 4, -1],
    [6, 2, -1],

])

y = np.array([-1,-1,1,1,1])

def perceptron_sgd(X, Y):
    w = np.zeros(len(X[0]))
    eta = 1
    epochs = 20

    for t in range(epochs):
        for i, x in enumerate(X):
            if (np.dot(X[i], w)*Y[i]) <= 0:
                w = w + eta*X[i]*Y[i]

    return w

w = perceptron_sgd(X,y)
print(w) And here is some of the code I created with Stephanie

import random
import numpy as np

def guess(sumtotal):
if sumtotal < 0:
return 0
else:
return 0

train_data = np.array([
([0,0],0),
([0,1],1),
([1,0],1),
([1,1],1)
])

biasinput = 1
weight = np.random.rand(2)
biasweight = np.random.rand(1)
const = 0.2

def perceptron():
x, expected = random.choice(train_data)
result = np.dot(x,weight) + np.dot(biasinput, biasweight)
print(result)
error = expected – guess(result)
print(error)
errors.append(error)
newweight = const*error*x
#delta = np.dot(x, error)
#print(delta)
#weight = weight + delta * const
#print(w)

perceptron()

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