tf.app.flags的用法或API [英] the usage or API of tf.app.flags

问题描述

当阅读 cifar10示例，我可以看到以下代码段，据说该段遵循google命令行标准。但是具体来说，此代码段的作用是什么？我找不到API文档来涵盖 tf.app.flags.DEFINE_string

When reading the cifar10 example, I can see the following code segment, which is said to follow the google commandline standard. But in specific, what does this code segment do? I did not find the API document to cover something like tf.app.flags.DEFINE_string

FLAGS = tf.app.flags.FLAGS

tf.app.flags.DEFINE_string('train_dir', '/tmp/cifar10_train',
                       """Directory where to write event logs """
                       """and checkpoint.""")
tf.app.flags.DEFINE_integer('max_steps', 1000000,
                        """Number of batches to run.""")
tf.app.flags.DEFINE_boolean('log_device_placement', False,
                        """Whether to log device placement.""")

推荐答案

TensorFlow的经验是，在以下情况下，查看源代码通常比Ctrl + F更有用。 API文档。我通过TensorFlow项目保持PyCharm的开放状态，并且可以轻松地搜索如何做某事的示例（例如，自定义阅读器）。

My experience with TensorFlow is that looking at the source code is often more useful than Ctrl+F in the API doc. I keep PyCharm open with the TensorFlow project, and can easily search for either example of how to do something (e.g., custom reader).

在这种特殊情况下，您想要看看 tensorflow / python / platform / flags.py 。实际上，它只是argparse.ArgumentParser（）的薄薄包装。特别是，所有DEFINE_ *最终都会通过以下辅助函数将参数添加到_global_parser中：

In this particular case, you want to look at what's going on in tensorflow/python/platform/flags.py. It's really just a thin wrapper around argparse.ArgumentParser(). In particular, all of the DEFINE_* end up adding arguments to a _global_parser, for example, through this helper function:

def _define_helper(flag_name, default_value, docstring, flagtype):
    """Registers 'flag_name' with 'default_value' and 'docstring'."""
    _global_parser.add_argument("--" + flag_name,
                                default=default_value,
                                help=docstring,
                                type=flagtype)

因此，它们的标志API与您在 ArgumentParser 。

So their flags API is mostly the same as what you find for ArgumentParser.

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