The PyTorch code hs the following core libraries (as also mentioned in this post):
 TH, THC, THNN, THCUNN

When I am checking the installation on my own machine, I see the followings:
$ pwd
/Users/daniel/miniconda3/lib/python3.7/site-packages/torch/lib/include

$ ls -lha
total 0
drwxr-xr-x    9 daniel  staff   288B Dec 30 15:48 .
drwxr-xr-x   20 daniel  staff   640B Dec 30 15:48 ..
drwxr-xr-x  143 daniel  staff   4.5K Dec 30 15:48 ATen
drwxr-xr-x   39 daniel  staff   1.2K Dec 30 15:48 TH
drwxr-xr-x    4 daniel  staff   128B Nov  1 16:26 THNN
drwxr-xr-x   14 daniel  staff   448B Dec 30 15:48 c10
drwxr-xr-x    5 daniel  staff   160B Dec 30 15:48 caffe2
drwxr-xr-x   21 daniel  staff   672B Dec 30 15:48 pybind11
drwxr-xr-x    6 daniel  staff   192B Dec 30 15:48 torch

There are two core libraries missing: THC  and THCUNN. I checked my Linux installation and it contained the missing libraries.