| # NeMo Lightning |
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| The NeMo Lightning directory provides custom PyTorch Lightning-compatible objects for seamlessly training NeMo 2.0 models using PTL. NeMo 2.0 models |
| are implemented using [Megatron Core](https://github.com/NVIDIA/Megatron-LM/tree/main/megatron/core). NeMo Lightning provides the bridge between higher-level, object-oriented PTL APIs and lower-level Megatron APIs. |
| For detailed tutorials and documentation on NeMo 2.0, refer to the [docs](https://docs.nvidia.com/nemo-framework/user-guide/latest/nemo-2.0/index.html). |
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| Some of the helpful classes provided here include: |
| - [`Trainer`](./pytorch/trainer.py): A lightweight wrapper around PTL's `Trainer` object which provides some additional support for capturing the arguments used to initialized the trainer. More information on NeMo 2's serialization mechanisms is available [here](https://docs.nvidia.com/nemo-framework/user-guide/latest/nemo-2.0/design/serialization.html). |
| - [`MegatronStrategy`](./pytorch/strategies/megatron_strategy.py): A PTL strategy that enables training of Megatron models on NVIDIA GPUs. |
| - [`MegatronParallel`](./megatron_parallel.py): Class which sets up and manages Megatron's distributed model parallelism. |
| - [`MegatronMixedPrecision`](./pytorch/plugins/mixed_precision.py): A specialized precision plugin for training Megatron-based models in PTL. |
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| More information on `MegatronStrategy`, `MegatronParallel`, and `MegatronMixedPrecision` can be found in [this document](https://docs.nvidia.com/nemo-framework/user-guide/latest/nemo-2.0/design/megatron.html). |
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