[🐛BUG] Multiple GPU error

[Mohsin-Ul-Islam]

Hi I am getting this error when running the recommendation on multiple cards. I have also set the gpu_id in the config as well.

File "/home/ubuntu/recommender/.venv/lib/python3.12/site-packages/torch/utils/data/distributed.py", line 77, in __init__
    num_replicas = dist.get_world_size()
                   ^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/recommender/.venv/lib/python3.12/site-packages/torch/distributed/distributed_c10d.py", line 2020, in get_world_size
    return _get_group_size(group)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/recommender/.venv/lib/python3.12/site-packages/torch/distributed/distributed_c10d.py", line 986, in _get_group_size
    default_pg = _get_default_group()
                 ^^^^^^^^^^^^^^^^^^^^
  File "/home/ubuntu/recommender/.venv/lib/python3.12/site-packages/torch/distributed/distributed_c10d.py", line 1150, in _get_default_group
    raise ValueError(
ValueError: Default process group has not been initialized, please make sure to call init_process_group.