AssertionError: model parallel group is not initialized

```
Traceback (most recent call last):
File "D:\_ruGPT3\ru-gpts\run_gpt3medium.py", line 11, in
gpt = RuGPT3XL.from_pretrained("sber-gpt3-medium", seq_len=512)
File "D:\_ruGPT3\ru-gpts\src\xl_wrapper.py", line 178, in from_pretrained
mpu.model_parallel_cuda_manual_seed(seed)
File "D:\_ruGPT3\ru-gpts\src\mpu\random.py", line 217, in model_parallel_cuda_manual_seed
model_parallel_seed = offset + get_model_parallel_rank()
File "D:\_ruGPT3\ru-gpts\src\mpu\initialize.py", line 109, in get_model_parallel_rank
return torch.distributed.get_rank(group=get_model_parallel_group())
File "D:\_ruGPT3\ru-gpts\src\mpu\initialize.py", line 90, in get_model_parallel_group
assert _MODEL_PARALLEL_GROUP is not None, \
AssertionError: model parallel group is not initialized
```

Used "Usage" example code but with rugpt3-medium model. Os: windows 10, py 3.9, gpu: rtx 3060 laptop.