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API使用指南
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API使用指南分功能向您介绍PaddlePaddle Fluid的API体系和用法，帮助您快速了解PaddlePaddle Fluid API的全貌，包括以下几个模块：

..  toctree::
    :maxdepth: 1

    high_low_level_api.md
    low_level/layers/index.rst
    low_level/executor.rst
    low_level/optimizer.rst
    low_level/metrics.rst
    low_level/model_save_reader.rst
    low_level/inference.rst
    low_level/distributed/index.rst
    low_level/memory_optimize.rst
    low_level/nets.rst
    low_level/parallel_executor.rst
    low_level/backward.rst
    low_level/parameter.rst
    low_level/program.rst