Hi, I am getting this error when trying to run the project according to readme. Please help! I also installed pytorch but it doesn't work!

[hamidthri]

process[ddpg_stage_1-1]: started with pid [17557]
Traceback (most recent call last):
File "/home/hamid/catkin_ws/src/project/src/ddpg_stage_1.py", line 15, in
import torch
ImportError: No module named torch
[ddpg_stage_1-1] process has died [pid 17557, exit code 1, cmd /home/hamid/catkin_ws/src/project/src/ddpg_stage_1.py __name:=ddpg_stage_1 __log:=/home/hamid/.ros/log/06a58c26-ebe6-11eb-9890-e09467e9f57a/ddpg_stage_1-1.log].
log file: /home/hamid/.ros/log/06a58c26-ebe6-11eb-9890-e09467e9f57a/ddpg_stage_1-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done