To get the shape of a tensor as a list in PyTorch, we can use two approaches. One using the size() method and another by using the shape attribute of a tensor in PyTorch. In this short article, we are going to see how to use both of the approaches.
Using size() method:
The size() method returns the size of the self tensor. The returned value is a subclass of a tuple.
Python3
import torch torch.empty(3, 4, 5).size() |
Output:Â
torch.Size([3, 4, 5])
We cast this into a list using the list() method.Â
Example:
Python3
v = torch.tensor([[1,0],[0,1]]) x = list(v.size()) print(x) |
Output:
[2, 2]
You can also use the Python interactive session as shown below:
Using shape attribute:
The tensor.shape is an alias to tensor.size(), though the shape is an attribute, and size() is a method. To verify this we can run the following in the interactive session.
We can similarly cast this into a list using the list() method.Â
Example:
Python3
import torch v = torch.tensor([[1,0],[0,1]]) x = list(v.shape) print(x) |
 Output:
[2,2]
Alternatively using the interactive session:
