<p>It would result in [4, 6], and you can find out more in <a href="https://arxiv.org/pdf/1512.03385.pdf" rel="nofollow noreferrer">this paper</a> </p>
Residual Neural Network: Concatenation or Element Addition?
<p>With the residual block in residual neural networks, is the addition at the end of the block true element addition or is it concatenation?</p>

<p>For example, would <code>addition([1, 2], [3, 4])</code> produce <code>[1, 2, 3, 4]</code> or <code>[4, 6]</code> ?</p>