title: How to access theano.tensor.var.TensorVariable?
body: <p>Let's say I have a matrix w of size(1152, 10) like this:</p>
  
  <pre><code>&gt;&gt;&gt; w.get_value(True)
  array([[-0.03824838, -0.02033614,  0.040734  , ...,  0.01585871,
           0.04165901,  0.01058411],
         [-0.00626427,  0.00891617,  0.01286055, ...,  0.00184506,
          -0.01282589, -0.00209718],
         [ 0.00457122, -0.01036582,  0.02780926, ...,  0.01269533,
          -0.00953711, -0.00271188],
         ..., 
         [ 0.00592541, -0.00267455,  0.02258315, ..., -0.00788802,
           0.02260087, -0.01107418],
         [-0.02363299,  0.02963436,  0.02735142, ..., -0.01933786,
          -0.03731941,  0.02085613],
         [-0.0079082 ,  0.01099584,  0.01910999, ...,  0.00122137,
          -0.006866  , -0.01500945]])
  </code></pre>
  
  <p>and I have a input of size(1152, 1) like this:</p>
  
  <pre><code>&gt;&gt; input.get_value(True)
  array([ 0.,  0.,  0., ...,  0.,  0.,  0.])
  </code></pre>
  
  <p>Now I wanna calculate the dot multilication of them like this:</p>
  
  <pre><code>&gt;&gt; result = theano.tensor.dot(image, w)
  </code></pre>
  
  <p>and it gave me:</p>
  
  <pre><code>&gt;&gt;&gt; result
  dot.0
  &gt;&gt;&gt; type(result)
  &lt;class 'theano.tensor.var.TensorVariable'&gt;
  &gt;&gt;&gt; type(image)
  &lt;class 'theano.tensor.sharedvar.TensorSharedVariable'&gt;
  &gt;&gt;&gt; type(classifier.W)
  &lt;class 'theano.tensor.sharedvar.TensorSharedVariable'&gt;
  </code></pre>
  
  <p>Does theano.tensor.dot return a symbolic expression instead of a value?</p>