ISTFT not available in PyTorch C++ frontend?

at::istft doesn’t seem to available in libtorch and I’m encountering this error:

error: ‘istft’ is not a member of ‘at’

I searched the include dir of libtorch distribution to find any declarations of the istft function, but there doesn’t seem to be any. I’m not sure if this was intentional or if I’ve missed something.

P.S: I’m using the <torch/torch.h> header
Version: libtorch 1.5.1

EDIT: This seems to be available in the latest nightly(1.7.0.dev20200727+cpu) and works fine