title: Using Tensorflow Estimator for LSTMs to Accept Images
body: <p>I would like to use Tensorflow's Estimator to simplify training using LSTM Networks. Apparently, to use tensorflow's Estimator, one must define a model function like so:</p>
  
  <pre><code>def some_model_fn(features, labels, mode):
      ...
  </code></pre>
  
  <p>I have no problem using placeholders to get the inputs and labels. How do I turn images into the shape accepted by tensorflow lstms which is [batch_size, num_time_steps, num_features]?</p>