What is PyTorch Lightning?

PyTorch Lightning is a powerful yet lightweight PyTorch wrapper, designed to make high performance AI research simple, allowing you to focus on science, not engineering. PyTorch Lightning is just organized PyTorch, but allows you to train your models on CPU, GPUs or multiple nodes without changing your code. Lightning makes state-of-the-art training features trivial to use with a switch of a flag, such as 16-bit precision, model sharding, pruning and many more.

Lightning ensures that when your network becomes complex your code doesn’t.

Refactoring your models to lightning is simple, allows you to get rid of a ton of boilerplate, reduce cognitive load, and gives you the ultimate flexibility to iterate on research ideas faster with all the latest deep learning best practices.

Lightning Design Philosophy

Lightning structures PyTorch code with these principles:

Lightning forces the following structure to your code which makes it reusable and shareable:

• Research code (the LightningModule).
• Engineering code (you delete, and is handled by the Trainer).
• Non-essential research code (logging, etc... this goes in Callbacks).
• Data (use PyTorch Dataloaders or organize them into a LightningDataModule).

Once you do this, you can train on multiple-GPUs, CPUs and even in 16-bit precision without changing your code!

Advantages over unstructured PyTorch

• Models become hardware agnostic
• Code is clear to read because engineering code is abstracted away
• Easier to reproduce
• Make fewer mistakes because lightning handles the tricky engineering
• Keeps all the flexibility (LightningModules are still PyTorch modules), but removes a ton of boilerplate
• Lightning has dozens of integrations with popular machine learning tools.
• Tested rigorously with every new PR.

Get started with our 2 step guide.

How To Use

Setup

docker pull nvcr.io/partners/gridai/pytorch-lightning:v1.3.7

Run example script on multi GPUs

# for single GPU
docker run --rm -it nvcr.io/partners/gridai/pytorch-lightning:v1.3.7 bash home/pl_examples/run_examples-args.sh --gpus 1 --max_epochs 5 --batch_size 1024

# for 4 GPUs
docker run --rm -it nvcr.io/partners/gridai/pytorch-lightning:v1.3.7 bash home/pl_examples/run_examples-args.sh --gpus 4 --max_epochs 5 --batch_size 1024

Examples

Hello world

• MNIST hello world

Image Classification

• Cifar10 baseline

Contrastive Learning

• BYOL
• CPC v2
• Moco v2
• SIMCLR

NLP

• BERT
• GPT-2

Reinforcement Learning

• DQN
• Dueling-DQN
• Reinforce

Vision

• GAN

Classic ML

• Logistic Regression
• Linear Regression

Support

If you have any questions please:

1. Read the docs.
2. Search through existing Discussions, or add a new question
3. Join our slack.

Licence

Please observe the Apache 2.0 license that is listed in this repository. In addition
the Lightning framework is Patent Pending.