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borderline1.py
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borderline1.py
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import math
import numpy as np
import random
def second(a):
return a[1]
def apply(inst):
majority = []
minority = []
for i in inst:
i = list(i)
if i[-1]=='N':
majority.append(i)
else:
minority.append(i)
k = len(majority)//len(minority)
synthetic = []
danger = []
for i in range(len(minority)):
x = minority[i][:-1]
nn = []
for j in range(len(inst)):
z = list(inst[j])[:-1]
dist = math.sqrt(sum([(x[l]-z[l])**2 for l in range(len(x))]))
if dist != 0:
nn.append((list(inst[j]), dist))
knn = sorted(nn, key=second)[:(2*k)]
new = [a[0] for a in knn]
m = 0
for a in new:
if a[-1]=='N':
m+=1
if m>k and m<(2*k):
danger.append(minority[i])
for i in range(len(danger)):
x = danger[i][:-1]
nn = []
for j in range(len(danger)):
if i != j:
z = danger[j][:-1]
dist = math.sqrt(sum([(x[l]-z[l])**2 for l in range(len(x))]))
nn.append((danger[j], dist))
knn = sorted(nn, key=second)[:k]
new = [a[0] for a in knn]
r = random.random()
while r==0 or r==1:
r = random.random()
for j in range(len(new)):
temp = [x[l]+r*abs(x[l]-new[j][l]) for l in range(len(new[j])-1)]
temp.append(new[j][-1])
synthetic.append(temp)
for i in synthetic:
inst.append(i)
return inst