title: create a tensor proto whose content is larger than 2GB
body: <p>I created a ndarray (W) which size is (2^22, 256), and I tried to use this array as my initialization of weight matirx using:</p>
  
  <pre><code>w = tf.Variable(tf.convert_to_tensor(W))
  </code></pre>
  
  <p>then, the tensorflow raised a error:
  <em>ValueError: Cannot create a tensor proto whose content is larger than 2GB.</em></p>
  
  <p>How can I fix this problem?
  PS. my weight matrix must using that (2^22, 256) matrix for initializing.
  THX :)</p>