Index_select

Usage

torch_index_select(self, dim, index)

Arguments

self: (Tensor) the input tensor.
dim: (int) the dimension in which we index
index: (LongTensor) the 1-D tensor containing the indices to index

Note

The returned tensor does not use the same storage as the original tensor. If out has a different shape than expected, we silently change it to the correct shape, reallocating the underlying storage if necessary.

index_select(input, dim, index, out=NULL) -> Tensor

Returns a new tensor which indexes the input tensor along dimension dim using the entries in index which is a LongTensor.

The returned tensor has the same number of dimensions as the original tensor (input). The dim\ th dimension has the same size as the length of index; other dimensions have the same size as in the original tensor.

Examples

if (torch_is_installed()) {

x = torch_randn(c(3, 4))
x
indices = torch_tensor(c(1, 3), dtype = torch_int64())
torch_index_select(x, 1, indices)
torch_index_select(x, 2, indices)
}
#> torch_tensor
#>  1.2879 -0.0847
#> -0.2543 -0.6711
#> -0.1368  0.0129
#> [ CPUFloatType{3,2} ]