torch-utils not found

[NigamKatta]

I am facing this issue. How to solve it?

from models import RSCNN_SSN_Cls as RSCNN_SSN

File "C:\Users\Nigam Katta\OneDrive - Georgia Institute of Technology\Relation-Shape-CNN-master\models_init_.py", line 1, in
from .rscnn_ssn_cls import RSCNN_SSN as RSCNN_SSN_Cls
File "C:\Users\Nigam Katta\OneDrive - Georgia Institute of Technology\Relation-Shape-CNN-master\models\rscnn_ssn_cls.py", line 9, in
from pointnet2_modules import PointnetSAModule, PointnetSAModuleMSG
File "C:\Users\Nigam Katta\OneDrive - Georgia Institute of Technology\Relation-Shape-CNN-master\models../utils\pointnet2_modules.py", line 5, in
import pointnet2_utils
File "C:\Users\Nigam Katta\OneDrive - Georgia Institute of Technology\Relation-Shape-CNN-master\models../utils\pointnet2_utils.py", line 11, in
from ext import pointnet2
File "C:\Users\Nigam Katta\OneDrive - Georgia Institute of Technology\Relation-Shape-CNN-master\models../utils_ext\pointnet2_init.py", line 2, in
from torch.utils.ffi import _wrap_function
ModuleNotFoundError: No module named 'torch.utils.ffi'