title: Why is RNN no weigth between hidden and output?
body: <p>PyTorch RNN has <code>RNN.weight_ih</code>, which is a weight between input and hidden layer, and <code>RNN.weight_hh</code>, which is a weight between hidden and hidden. Why is there no weight between hidden and output?</p>
  <p><img src="https://i.stack.imgur.com/PcaGd.png" alt="schematic of unrolled RNN showing the three weight matrices" /></p>
  <p>When I was learning about RNNs, I learned that there are 3 weights.</p>