Pytorch：随机抽样一个向量

fantomas

1. sample_size = 5
   
2. a = torch.randn(10)
   
3. b = torch.randperm(10)
   
4. a = a.index_select(0,b)
   
5. a = a[0:sample_size]

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在Matlab中的等价就像是

1. sample_size = 5
   
2. a = rand(10,1)
   
3. idx = randperm(10)
   
4. b = a(idx(1:sample_size))

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