image/svg+xml - 3 - 2 - 1 1 2 3 - 3 - 2 - 1 φ μ,σ 2 (x) 0.8 0.6 0.4 0.2 0.0 −5 −3 1 3 5 x 1.0 −1 0 2 4 −2 −4 μ=0, μ=0, μ=−2, μ=0, =0.2 2 σ =1.0 2 σ =5.0 2 σ =0.5 2 σ