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Paddle 2 Introduction
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Introduction of paddle2.

For more information, you can view these pages:

- `paddle 2 basic concept <./basic_concept/index_en.html>`_ : introduction of paddle2 basic concept.
- `migration tools <./migration_en.html>`_ ：how to use migration tools to upgrade your code.

..  toctree::
    :hidden:

    migration_en.rst