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Add handson to ColossalAI. (#1896) 
Co-authored-by: Boxiang Wang <boxiang.wang1@gmail.com>
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Handson 4: Comparison of Large Batch Training Optimization

Prepare Dataset

We use CIFAR10 dataset in this example. The dataset will be downloaded to ../data by default. If you wish to use customized directory for the dataset. You can set the environment variable DATA via the following command.

export DATA=/path/to/data

Run on 2*2 device mesh

colossalai run --nproc_per_node 4 train.py --config config.py