title: TypeError: List of Tensors when single Tensor expected - when using const with tf.random_normal
body: <p>I have the following TensorFlow code:</p>
  
  <pre><code>tf.constant(tf.random_normal([time_step, batch_size], -1, 1))
  </code></pre>
  
  <p>I am getting <code>TypeError: List of Tensors when single Tensor expected</code>. Could you tell me what is wrong with the code?</p>