title: How to merge two tensor?
body: <p>I want to merge two tensors <code>a</code> and <code>b</code> into <code>c</code>. What I've tried is:</p>
  
  <p><a href="https://i.stack.imgur.com/Zreaq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Zreaq.png" alt="enter image description here"></a></p>
  
  <p>But my expectation is <code>c = [1, 2, 3, 4, 5, 6]</code>. How can I get it?</p>