torch.index_select:通過選擇索引然後去得到想要的tensor,針對比較長的tensor
torch.index_select(tensor,次元,選擇的index)
代碼示例:
import torch
#shape為(2,2,3)
a=torch.tensor([[[1,2,3],[4,5,6]],
[[7,8,9],[10,11,12]]])
#選擇索引0和索引2的tensor
indices=torch.tensor([0,2])
#tensor為a,次元為2,索引為0和2
b=torch.index_select(a,2,indices)
print(b)
輸出;
tensor([[[ 1, 3],
[ 4, 6]],
[[ 7, 9],
[10, 12]]])