.stack()

In PyTorch, the .stack() method stacks given tensors along a specified dimension to create a combined tensor. The tensors being stacked must have the same shape.

Syntax

torch.stack(tensors, dim=0, out=None)

• tensors: The list or sequence of tensors to be stacked.
• dim: The dimension along which to stack the tensors. The default value is 0.
• out: The optional output tensor to store the result. If None, a new tensor is returned. The default is None.

Example

The following example demonstrates the usage of the .stack() method:

import torch

# Define tensors
t0 = torch.zeros(4)
t1 = torch.ones(4)

# Stack tensors along the default dimension (dim=0)
t2 = torch.stack((t0, t1))

# Stack tensors along dimension 1
t3 = torch.stack((t0, t1), dim=1)

print(t2)
print('\n')
print(t3)

The returned tensors are as follows:

tensor([[0., 0., 0., 0.],
        [1., 1., 1., 1.]])


tensor([[0., 1.],
        [0., 1.],
        [0., 1.],
        [0., 1.]])