title: How to update a subset of 2D tensor in Tensorflow?
body: <p>I want to update an index in a 2D tensor with value 0. So data is a 2D tensor whose 2nd row 2nd column index value is to be replaced by 0. However, I am getting a type error. Can anyone help me with it?</p>
  
  <blockquote>
    <p>TypeError: Input 'ref' of 'ScatterUpdate' Op requires l-value input</p>
  </blockquote>
  
  <pre><code>data = tf.Variable([[1,2,3,4,5], [6,7,8,9,0], [1,2,3,4,5]])
  data2 = tf.reshape(data, [-1])
  sparse_update = tf.scatter_update(data2, tf.constant([7]), tf.constant([0]))
  #data = tf.reshape(data, [N,S])
  init_op = tf.initialize_all_variables()
  
  sess = tf.Session()
  sess.run([init_op])
  print "Values before:", sess.run([data])
  #sess.run([updated_data_subset])
  print "Values after:", sess.run([sparse_update])
  </code></pre>