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pytorch-lightning

High-level PyTorch framework with Trainer class, automatic distributed training (DDP/FSDP/DeepSpeed), callbacks system, and minimal boilerplate. Scales from laptop to supercomputer with same code. Use when you want clean training loops with built-in best practices.

backend/cli/skills/ml-training/pytorch-lightning/SKILL.md

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# PyTorch Lightning - High-Level Training Framework

## Quick start

PyTorch Lightning organizes PyTorch code to eliminate boilerplate while maintaining flexibility.

**Installation**:
```bash
pip install lightning
```

**Convert PyTorch to Lightning** (3 steps):

```python