# Train ViT on CIFAR-10 from scratch

## 🚀 Quick Start

This example provides a training script, which provides an example of training ViT on CIFAR10 dataset from scratch.

- Training Arguments
  - `-p`, `--plugin`: Plugin to use. Choices: `torch_ddp`, `torch_ddp_fp16`, `low_level_zero`. Defaults to `torch_ddp`.
  - `-r`, `--resume`: Resume from checkpoint file path. Defaults to `-1`, which means not resuming.
  - `-c`, `--checkpoint`: The folder to save checkpoints. Defaults to `./checkpoint`.
  - `-i`, `--interval`: Epoch interval to save checkpoints. Defaults to `5`. If set to `0`, no checkpoint will be saved.
  - `--target_acc`: Target accuracy. Raise exception if not reached. Defaults to `None`.

### Install requirements

```bash
pip install -r requirements.txt
```

### Train

```bash
# train with torch DDP with fp32
colossalai run --nproc_per_node 4 train.py -c ./ckpt-fp32

# train with torch DDP with mixed precision training
colossalai run --nproc_per_node 4 train.py -c ./ckpt-fp16 -p torch_ddp_fp16

# train with low level zero
colossalai run --nproc_per_node 4 train.py -c ./ckpt-low_level_zero -p low_level_zero
```

Expected accuracy performance will be:

| Model     | Single-GPU Baseline FP32 | Booster DDP with FP32 | Booster DDP with FP16 | Booster Low Level Zero |
| --------- | ------------------------ | --------------------- | --------------------- | ---------------------- |
| ViT       | 83.00%                   | 84.03%                | 84.00%                | 84.43%                 |