时间:2020-10-07 14:28:27 | 栏目:Python代码 | 点击:次
index_select
anchor_w = self.FloatTensor(self.scaled_anchors).index_select(1, self.LongTensor([0]))
参数说明:index_select(x, 1, indices)
1代表维度1,即列,indices是筛选的索引序号。
例子:
import torch x = torch.linspace(1, 12, steps=12).view(3,4) print(x) indices = torch.LongTensor([0, 2]) y = torch.index_select(x, 0, indices) print(y) z = torch.index_select(x, 1, indices) print(z) z = torch.index_select(y, 1, indices) print(z)
结果:
tensor([[ 1., 2., 3., 4.], [ 5., 6., 7., 8.], [ 9., 10., 11., 12.]]) tensor([[ 1., 2., 3., 4.], [ 9., 10., 11., 12.]]) tensor([[ 1., 3.], [ 5., 7.], [ 9., 11.]]) tensor([[ 1., 3.], [ 9., 11.]])