How do I use cat in C++? (torch::cat)

C++
1

Hello!
How do I add my tensor recurrent_input at the end of my tensor input? torch::cat documentation seems to be missing? https://github.com/pytorch/pytorch/issues/35667

Note that both are 1 dims tensors. 1x10 and 1x40

2

torch::cat({ input, recurrent_input }, 0);

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3

How to replicate this behaviour

>>> t = torch.tensor([[1, 2, 3], [4, 4, 4]])                                                        
>>> t
tensor([[1, 2, 3],
        [4, 4, 4]])
>>> torch.cat(3*[t])

I want to know how to cat repeat

4

Your approach would work, so I’m unsure, if you are facing any issues with it.
Alternatively, you could also try to use tensor.expand or tensor.repeat in case this would better fit your use case.

5

I am sorry I didn’t make my question clear.
I want to know how to implement this in torch cpp.
What’s the exact syntax for this?
Thank you!

6

Ah, I didn’t realize the thread topic.
expand and repeat are both available in libtorch e.g. via: tensor.expand({3, 1}).

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