title: TensorFlow get values in a placeholder
body: <p>I'm new with TensorFlow. I have some issues understanding. I would like to see the values inside the placeholder when I feed them </p>
  
  <pre><code>most simplified example :
  X = tf.placeholder(tf.float,[2,2]
  Y = X
  
  sess.run(Y,feed_dict={X:[[1,2],[3,4]]})
  </code></pre>
  
  <p>Did a command as:</p>
  
  <pre><code>print(sess.run(Y))
  </code></pre>
  
  <p>Result:</p>
  
  <pre><code>[[1,2],[3,4]]
  </code></pre>
  
  <p>e.g. I don t need the shape, type... of the placeholder but the content.</p>
  
  <p>Thanks for your help.</p>