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  1. # neural network v2, 3 years later
  2. import numpy as np
  3. import math as mt
  4. def neuron(weights, inputs, bias):
  5. 	return (sum(np.multiply(np.array(weights), np.array(inputs)), bias))
  6. def relu(neuron):
  7. 	return (1/(1+mt.exp(neuron)))
  8. def reluderiv(neuron):
  9. 	return neuron*(1 - neuron)
  10. connections = []
  11. structure = [2, 3, 1]
  12. for i in structure:
  13. 	toadd = []
  14. 	for m in range(i):
  15. 		toadd.append(m)
  16. 	toadd.append(i)
  17. 	for v in range(i):
  18. 		connections.append(toadd)
  19. print(connections)
  20. traindata = [[[0, 0], [0]], [[1, 1], [0]], [[0, 1], [1]], [[1, 0], [1]]]
  21. history = []
  22. confidence = 0.5
  23. for u in traindata:
  24. 	layer = u[0]
  25. 	for f in connections:
  26. 		last = layer
  27. 		layer = []
  28. 		for k in f:
  29. 			layer.append(relu(neuron(k[0], last, float(k[1]))))
  30. 		history.append(layer)
  31. 	print(history)
  32. 	train = [1, 0] if u[1] == true else [0, 1]
  33. 	layerarr = np.array(layer)
  34. 	trainarr = np.array(train)
  35. 	totalerror = abs(sum(layerarr-trainarr))
  36. 	totalerrorsquared = sum(np.square(layerarr-trainarr))/2
  37. 	mse = totalerrorsquared/(len(traindata))
  38. 	backhist = history.reverse()
  39. 	backconn = connections.reverse()
  40. 	for k in backconn:
  41. 		for i in k:
  42. 			erroroutderiv = (i - train)
  43. 			outnetderiv = reluderiv(i)
  44. 			netweightderiv = backhist[backconn.index(k) + 1][backconn.index(i)]
  45. 			errorweightderiv = erroroutderiv*outnetderiv*netweightderiv
  46. 			backconn[backconn.index(k)][backconn.index(i)] += confidence*errorweightderiv
  47. 	connections = backconn.reverse()
  48. 	print(connections)
Runtime error #stdin #stdout #stderr 1.85s 50616KB
comments (?)
stdin 
Standard input is empty
stdout 
[[0, 1, 2], [0, 1, 2], [0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3], [0, 1]]
stderr 
Traceback (most recent call last):
  File "./prog.py", line 29, in <module>
TypeError: 'int' object is not subscriptable
https://ideone.com/1Xf2AQ
language:
Python 3 (python  3.12)
created:
215 days ago
visibility:
public

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