title: How to properly set the input_shape of LSTM layers?
body: <p>I have an input data with the following shape:<code>(5395, 69, 1)</code></p>
  <p><strong>Should my input_shape be:</strong></p>
  <ul>
  <li><p><code>(69,1)</code> or</p>
  </li>
  <li><p><code>(1,69)</code> ?</p>
  </li>
  </ul>
  <p>With 69 neurons in the LSTM layer I get in the first input_shape 19'596 parameters to train, and with the second
  38'364 parameters, aren't those the result of get as input 1 and 69 values, respectively? My question is should I have as input 1 because I have 1 feature or 69 because I have 69 timesteps, and why?</p>