Created
March 20, 2018 10:23
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convergence
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| import math | |
| def sign (x): | |
| if x > 0: return 1 | |
| if x < 0: return -1 | |
| return 0 | |
| def is_misclassified (x, w, b, y): | |
| val = x[0]*w[0] + x[1]*w[1] + b | |
| print ("x=", x, "w=", w, "b=", b, "y=", y, "mis_classification=", sign(y) != sign(val)) | |
| if sign(y) != sign(val): return True | |
| return False | |
| def update (x, w, b, y): | |
| new_w = [ | |
| w[0] + x[0] * y, | |
| w[1] + x[1] * y | |
| ] | |
| new_b = b + y | |
| print ("updated! w and b ", new_w, new_b) | |
| return new_w, new_b | |
| b=0 | |
| w=[0, 0] | |
| k=0 | |
| xs = [ | |
| [-1,1], | |
| [0,-1], | |
| [10,1] | |
| ] | |
| ys = [1,-1, 1] | |
| for s in range(50): | |
| print ("loooooop_____", s) | |
| for i in range(3): | |
| x = xs[i] | |
| y = ys[i] | |
| #print ("i=",i, x, y) | |
| is_mc = is_misclassified (x, w, b, y) | |
| if is_mc: | |
| w,b = update (x, w, b, y) |
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