title: Batch normalization initializer in TensorFlow
body: <p>In TensorFlow, batch normalization parameters include <code>beta</code>, <code>gamma</code>, <code>moving mean</code>, and <code>moving variance</code>. However, for initializing these parameters there is only one argument in <code>tf.contrib.layers.batch_norm(*args, **kwargs)</code> called <code>param_initializers</code> which according to the documents it contains optional initializers for <code>beta</code>, <code>gamma</code>, <code>moving mean</code> and <code>moving variance</code>.</p>
  
  <p>How can we use <code>param_initializers</code> to initialize these parameters?</p>