def train(self, dataSet, C, toler, kernel = kernel_func):
'''用smo算法求拉格朗日乘算子'''
Kernel.clearCache()#清空缓存
smo = SMOAlgorithm(dataSet, C, toler, kernel)
self.alphas = smo.run()
self.kernel = smo.kernel
self.dataSet = dataSet
#计算b的值
b_array = []
for j in range(len(self.alphas)):
alphaj = self.alphas[j]
assert 0 <= alphaj and alphaj <= C
#先则0 < alpha < c的正分量
if alphaj == 0 or alphaj == C:
continue
yj = dataSet.getLabel(j)
b = 0.0
for i in range(len(self.alphas)):
alphai = self.alphas[i]
yi = dataSet.getLabel(i)
kij = self.kernel.compute(i, j)
b += alphai * yi * kij
b = yj - b
b_array.append(b)
self.b = numpy.array(b_array).mean()
return self.alphas, self.b
def test_clear(self):
Kernel.clearCache()
print(Kernel.cacheMatrix)
