title: Input LSTM on multivariate time series
body: <p>I am trying to use LSTM for time series predictions on multivariate data. I have 50000 samples with 15 dimensions. I want to use look back of 10. What will be the shape of input to LSTM layer. Will it be </p>
  
  <pre><code>(samples,look back,dimension) = (50000,10,15) 
  </code></pre>
  
  <p>or</p>
  
  <pre><code>(samples,dimension, look back) = (50000,15,10)
  </code></pre>
  
  <p>I am using Keras.</p>