title: How to test a regression model in tensorflow?
body: <p>i'm new to python and tensorflow.
  I follow the cifar10 example to build my own regression problem:
     read binary files; pack to batch; MSE training.</p>
  
  <p>Now in the test stage, is there a way to write regression result streams to a binary file? Most examples are about classification, they only need return a accuracy.
  So is there any examples?
  Much thanks!</p>