title: ImportError: No module named downsample
body: <p>I am using Theano. The OS is Ubuntu. The Theano is UPTODATE. I am wondering why I am getting by <code>from theano.tensor.signal.downsample import max_pool_2d</code> command.</p>
  
  <p><code>ImportError: No module named downsample</code>.</p>