title: TensorFlow `True` and `False` booleans
body: <p>Is there a more TensorFlow-nic way to get a <a href="/questions/tagged/tensorflow" class="post-tag" title="show questions tagged &#39;tensorflow&#39;" rel="tag">tensorflow</a> boolean than <code>tf.constant(True)</code> and <code>tf.constant(False)</code>? A sort of <code>tf.True</code> or <code>tf.False</code> (that do no exist).</p>