title: What is the difference between lstm(256) + lstm(256) and lstm(512)?
body: <p>here is code</p>
  
  <pre><code>model = Sequential()
  model.add(LSTM(256, input_shape=(None, 1), return_sequences=True))
  model.add(LSTM(256, input_shape=(None, 1), return_sequences=True))
  model.add(Dense(1))
  </code></pre>
  
  <p>this is lstm(256) + lstm(256) code</p>
  
  <pre><code>model = Sequential()
  model.add(LSTM(512, input_shape=(None, 1), return_sequences=True))
  model.add(Dense(1))
  </code></pre>
  
  <p>this is lstm(512) code</p>
  
  <p>So, What is the difference between lstm(256) + lstm(256) and lstm(512)?</p>
  
  <p>Is it just parallel, and in the end, it means the same thing?</p>
  
  <p>Or what is the difference between these two?</p>