PyTorchトレーニングスクリプトをColossal Ai分散トレーニングライブラリを使用するように変換するには、以下の手順に従います：

ターミナルでpip install colossal-aiコマンドを実行してColossal Aiライブラリをインストールします。

トレーニングスクリプトの先頭に以下の行を追加して、トレーニングスクリプトにColossal Aiライブラリをインポートします：


```
import colossalai
Initialize Colossal Ai engine and trainer by adding these lines after importing Colossal Ai:
engine = colossalai.Engine()
trainer = colossalai.Trainer(engine=engine)
Replace PyTorch’s DataParallel with Colossal Ai’s DistributedDataParallel by adding this line after initializing trainer:
trainer.model = colossalai.nn.DistributedDataParallel(trainer.model)
Start distributed training by invoking the scripts using the distributed launcher provided by PyTorch as we used launch_from_torch in Step 2. You need to replace <num_gpus> with the number of GPUs available on your machine. This number can be 1 if you only want to use 1 GPU.
torch.distributed.launch --nproc_per_node=<num_gpus> train.py

```
To convert your PyTorch training script into using the Colossal Ai distributed training library, you can follow these steps:

Install Colossal Ai library by running pip install colossal-ai command in your terminal.

Import Colossal Ai library in your training script by adding this line at the beginning of your script:


```
import colossalai
Initialize Colossal Ai engine and trainer by adding these lines after importing Colossal Ai:
engine = colossalai.Engine()
trainer = colossalai.Trainer(engine=engine)
Replace PyTorch’s DataParallel with Colossal Ai’s DistributedDataParallel by adding this line after initializing trainer:
trainer.model = colossalai.nn.DistributedDataParallel(trainer.model)
Start distributed training by invoking the scripts using the distributed launcher provided by PyTorch as we used launch_from_torch in Step 2. You need to replace <num_gpus> with the number of GPUs available on your machine. This number can be 1 if you only want to use 1 GPU.
torch.distributed.launch --nproc_per_node=<num_gpus> train.py

```