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机器学习平时作
机器学习第二、三章作业
通信工程学院 1301120598 董静
2.3 (题目略)
Ans.
S0= (φ,φ,φ,φ,φ,φ) v (φ,φ,φ,φ,φ,φ)
G0 = (?, ?, ?, ?, ?, ?) v (?, ?, ?, ?, ?, ?)
Example 1: Sunny, Warm, Normal, Strong, Warm, Same, Yes
S1=(Sunny, Warm, Normal, Strong, Warm, Same) v (φ,φ,φ,φ,φ,φ)
G1 = (?, ?, ?, ?, ?, ?) v (?, ?, ?, ?, ?, ?)
Example 2: Sunny, Warm, High, Strong, Warm, Same, Yes
S2= {(Sunny, Warm, Normal, Strong, Warm, Same) v (Sunny, Warm, High, Strong, Warm, Same),
(Sunny, Warm, ?, Strong, Warm, Same) v (φ,φ,φ,φ,φ,φ)}
G2 = (?, ?, ?, ?, ?, ?) v (?, ?, ?, ?, ?, ?)
Example 3: Rainy, Cold, High, Strong, Warm, Change, No
S3={(Sunny, Warm, Normal, Strong, Warm, Same) v (Sunny, Warm, High, Strong, Warm, Same),
(Sunny, Warm, ?, Strong, Warm, Same) v (φ,φ,φ,φ,φ,φ)}
G3 = {(Sunny, ?, ?, ?, ?, ?) v (?, Warm, ?, ?, ?, ?),
(Sunny, ?, ?, ?, ?, ?) v (?, ?, ?, ?, ?, Same),
(?, Warm, ?, ?, ?, ?) v (?, ?, ?, ?, ?, Same)}
Example 4: Sunny, Warm, High, Strong, Cool, Change, Yes
S4= {(Sunny, Warm, ?, Strong, ?, ?) v (Sunny, Warm, High, Strong, Warm, Same),
(Sunny, Warm, Normal, Strong, Warm, Same) v (Sunny, Warm, High, Strong, ?, ?),
(Sunny, Warm, ?, Strong, ?, ?) v (φ,φ,φ,φ,φ,φ),
(Sunny, Warm, ?, Strong, Warm, Same) v (Sunny, Warm, High, Strong, Cool, Change)}
G4 = {(Sunny, ?, ?, ?, ?, ?) v (?, Warm, ?, ?, ?, ?),
(Sunny, ?, ?, ?, ?, ?) v (?, ?, ?, ?, ?, Same),
(?, Warm, ?, ?, ?, ?) v (?, ?, ?, ?, ?, Same)}
2.5 (题目略)
(a). 第一步:S0 {(Q Q Q Q ), (Q Q Q Q)}
G0 {(? ? ? ?), (? ? ? ?)}
第二步:S1 {(male brown tall US), (female black short US)
G1 {(? ? ? ?), (? ? ? ?)}
第三步:S2 {(male brown ? ?), (female black short US)
G2 {(? ? ? ?), (? ? ? ?)}
第四步:S3 {(male brown ? ?), (female black short US)
G3 {(male ? ? ?), (? ? ? ?),? ? ? ?,? ? ? US}
第五步:S4 {(male brown ? ?), (female ? short ?)
G4 {(male ? ? ?), (? ? ? ?)}
(b).假设中的每个属性可以取两个值,所以与题目例题一致的假设数目为:
(2*2*2*2)*(2*2*2*2) = 256
(c). 这个最短序列应该为8,
如果只有一个训练样例,则假设空间有个假设,我们针对每一个属性来设置训练样例,使每次的假设空间减半。则经过8次训练后,可收敛到单个正确的假设。
female,blanck,short,Portuguese,female,blonde,tall,Indian
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