kernels.py 文件源码

def getTrainTestKernel(self, params, Xtest):
        self.checkParams(params)
        ell2 = np.exp(2*params[0])

        z = Xtest / np.sqrt(Xtest.shape[1])
        S = 1 + self.X_scaled.dot(z.T)
        sz = 1 + np.sum(z**2, axis=1)
        sqrtEll2Psx = np.sqrt(ell2+self.sx)
        sqrtEll2Psz = np.sqrt(ell2+sz)
        K = S / np.outer(sqrtEll2Psx, sqrtEll2Psz)
        return np.arcsin(K)