Documentation for torch::lstm?

I am writing to find the location of the documentation for torch::lstm. I looked up the function on the CPP docs for torch namespace, and I could not find it.

Any pointers to it would be greatly appreciated. I am trying to adapt code from the book Hands On Machine Learning with C++, and there is mention of it.

I found an equivalent function in at::lstm, and the documentation is here in the cpp docs.