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Reproducible model building is hard. As teams iterate on models, data, or prompts, it quickly becomes difficult to track what changed and why results improved or regressed. LitLogger automatically keeps a complete history of every run, including inputs, metrics, and model outputs, so teams can trace changes, compare results, and audit decisions over time instead of re-running everything from scratch.
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The Lightning Logger is a python library to log your metrics to the Lightning.AI platform.
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LitLogger is free for developers and built into [Lightning AI](https://lightning.ai/), an independent platform trusted by enterprises. It runs in the cloud or fully on-prem, giving teams long-term stability, clear auditability, and control over their experiment history.
Once installed, you can dive right in with our quick start guide. This example shows how to log metadata and metrics using the standalone API.
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It's designed to be simple enough for beginners yet robust enough to handle more advanced use cases.
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### Hello world example
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LitLogger works with any Python code, not just model training. Use it with PyTorch, vLLM, LangChain, custom scripts, batch jobs, or live services to track metrics and results consistently.
Integrate Lightning Logger into your model training process with ease.
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The example below extends a basic model to log both training and validation metrics, giving you clear insights into model performance with every step.
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### PyTorch Lightning example
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PyTorch Lightning now comes with LitLogger natively built in. It's also built by the PyTorch Lightning team for guaranteed fast performance at 10,000+ GPU scale.
This detailed example illustrates how to simulate a changing loss value during training.
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It logs metric updates at intervals, so you can see how your loss fluctuates over time.
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This practical demonstration shows you the flexibility of Lightning Logger in handling real-world training scenarios.
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### Example 3: loss simulator
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This is a fun example that simulates a long model training run.
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<details>
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<summary>Python code</summary>
@@ -151,5 +149,9 @@ litlogger.finalize()
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</details>
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Enjoy exploring Lightning Logger and watch your project's metrics come to life on [lightning.ai](lightning.ai)!
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This library is designed to simplify your workflow while providing you with clear, insightful data that drives smarter decisions in your development process.
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# Community
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LitLogger is a community project accepting contributions - Let's make the world's most advanced AI experiment manager.
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💬 [Get help on Discord](https://discord.com/invite/XncpTy7DSt)
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