title: Tensorboard DuplicateFlagError
body: <p>I'm modifying tensorboards example code for CNN's:
  <a href="https://www.tensorflow.org/tutorials/deep_cnn#launching_and_training_the_model" rel="nofollow noreferrer">https://www.tensorflow.org/tutorials/deep_cnn#launching_and_training_the_model</a></p>
  
  <p>I'm getting this error:</p>
  
  <pre><code>DuplicateFlagError: The flag 'batch_sizes' is defined twice. First from D:/UofU/.../mycifar10.py, Second from D:/UofU/.../mycifar10.py. (Where both path names are the same)  Description from first occurrence: Numbers of images to process in a batch.
  </code></pre>
  
  <p>This is the jist of the code that must be producing the error:</p>
  
  <pre><code>tf.app.flags.DEFINE_integer('batch_size', 49,
                             """Numbers of images to process in a batch.""")
  </code></pre>