Merge pull request #1 from NVIDIA/update-readme

Update README.md

README.md

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-<h3 align="center">Megatron Energon</h3>
+  <h3 align="center">Megatron's multi-modal data loader</h3>
+  <h3 align="center">Megatron Energon</h3>
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-    Megatron's multi-modal data loader
-    <br /><br />
     <a href="https://github.com/NVIDIA/Megatron-Energon/actions/workflows/tests.yml"><img src="https://github.com/NVIDIA/Megatron-Energon/actions/workflows/tests.yml/badge.svg" alt="Tests"></a> <a href="https://nvidia.github.io/Megatron-Energon/"><img src="https://github.com/NVIDIA/Megatron-Energon/actions/workflows/documentation.yml/badge.svg" alt="Documentation"></a>
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     <a href="https://github.com/NVIDIA/Megatron-Energon/issues">Report Bug</a>
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+ _**DISCLAIMER**: This package contains research code. APIs may change. It may remain under Megatron or be integrated into [NVIDIA's Data Loading Library (DALI)](https://developer.nvidia.com/dali)_
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+# What is this?
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+**Megatron Energon** is the multi-modal data loader of [Megatron](https://github.com/NVIDIA/Megatron-LM) (you can also use it independently).
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+It's best at
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+- loading large training data to train large multi-modal models
+- blending many different datasets together
+- distributing the work across many nodes and processes of a cluster
+- ensuring reproducibility and resumability
+- adapting easily to various types of data samples and processing
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+Try using it together with [Megatron](https://github.com/NVIDIA/Megatron-LM) Core.
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 # Quickstart
 **Megatron Energon** is the multi-modal data loader of Megatron.