title: Theano.function equivalent in Tensorflow
body: <p>I am wondering if there is any equivalent to </p>
  
  <pre class="lang-none prettyprint-override"><code>theano.function(inputs=[x,y], # list of input variables
  outputs=..., # what values to be returned
  updates=..., # “state” values to be modified
  givens=...,  # substitutions to the graph)
  </code></pre>
  
  <p>in TensorFlow</p>