Bug:The following error is reported after executing the command “./scripts/pretrain_single_node.sh --debug”.How can I solve this problem?

[tt-s-t]

Traceback (most recent call last): File "pretrain_gpt2.py", line 829, in Traceback (most recent call last): File "pretrain_gpt2.py", line 829, in main() File "pretrain_gpt2.py", line 742, in main main() File "pretrain_gpt2.py", line 742, in main initialize_distributed(args) File "pretrain_gpt2.py", line 675, in initialize_distributed initialize_distributed(args) File "pretrain_gpt2.py", line 675, in initialize_distributed set_deepspeed_activation_checkpointing(args) File "pretrain_gpt2.py", line 637, in set_deepspeed_activation_checkpointing set_deepspeed_activation_checkpointing(args) File "pretrain_gpt2.py", line 637, in set_deepspeed_activation_checkpointing deepspeed.checkpointing.configure(mpu, deepspeed_config=args.deepspeed_config, num_checkpoints=args.num_layers) File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/runtime/activation_checkpointing/checkpointing.py", line 881, in configure deepspeed.checkpointing.configure(mpu, deepspeed_config=args.deepspeed_config, num_checkpoints=args.num_layers) File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/runtime/activation_checkpointing/checkpointing.py", line 881, in configure _configure_using_config_file(deepspeed_config, mpu=mpu) File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/runtime/activation_checkpointing/checkpointing.py", line 799, in _configure_using_config_file _configure_using_config_file(deepspeed_config, mpu=mpu) File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/runtime/activation_checkpointing/checkpointing.py", line 799, in _configure_using_config_file if dist.get_rank() == 0: File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/comm/comm.py", line 352, in get_rank assert cdb is not None and cdb.is_initialized(), 'DeepSpeed backend not set, please initialize it using init_process_group()' AssertionError: DeepSpeed backend not set, please initialize it using init_process_group() if dist.get_rank() == 0: File "/home/atr/.conda/envs/stt/lib/python3.7/site-packages/deepspeed/comm/comm.py", line 352, in get_rank assert cdb is not None and cdb.is_initialized(), 'DeepSpeed backend not set, please initialize it using init_process_group()' AssertionError: DeepSpeed backend not set, please initialize it using init_process_group()