題目要求:
數據集:
w1=numpy.array([[0.42,-0.087,0.58],[-0.2,-3.3,-3.4],[1.3,-0.32,1.7],
[0.39,0.71,0.23],[-1.6,-5.3,-0.15],[-0.029,0.89,-4.7],[-0.23,1.9,2.2],
[0.27,-0.3,-0.87],[-1.9,0.76,-2.1],[0.87,-1,-2.6]])
w2=numpy.array([[-0.4,0.58,0.089],[-0.31,0.27,-0.04],[0.38,0.055,-0.035],
[-0.15,0.53,0.011],[-0.35,0.47,0.034],[0.17,0.69,0.1],[-0.011,0.55,-0.18],
[-0.27,0.61,0.12],[-0.065,0.49,0.0012],[-0.12,0.054,-0.063]])
w3=numpy.array([[0.83,1.6,-0.014],[1.1,1.6,0.48],[-0.44,-0.41,0.32],
[0.047,-0.45,1.4],[0.28,0.35,3.1],[-0.39,-0.48,0.11],[0.34,-0.079,0.14],
[-0.3,-0.22,2.2],[1.1,1.2,-0.46],[0.18,-0.11,-0.49]])
考慮不同維數下的高斯概率密度模型。
- 編寫程序,對表格中的類w1中的3個特徵,分別求解最大似然估計。
解答:
根據高斯分布的均值和方差極大似然估計結果: