title: What is the alternative of numpy.newaxis in tensorflow?
body: <p>Hi I am new to tensorflow. I want to implement the following python code in tensorflow.</p>
  
  <pre><code>import numpy as np
  a = np.array([1,2,3,4,5,6,7,9,0])
  print(a) ## [1 2 3 4 5 6 7 9 0]
  print(a.shape) ## (9,)
  b = a[:, np.newaxis] ### want to write this in tensorflow.
  print(b.shape) ## (9,1)
  </code></pre>