message: fix batch normalization for policy head
diff: @@ -84,7 +84,8 @@ class DualNetwork(object):
  # policy head
  policy_conv = tf.nn.relu(my_batchn(
  - my_conv2d(shared_output, filters=2, kernel_size=[1, 1])))
  + my_conv2d(shared_output, filters=2, kernel_size=[1, 1]),
  + center=False, scale=False))
  logits = tf.layers.dense(
  tf.reshape(policy_conv, [-1, go.N * go.N * 2]),
  go.N * go.N + 1)
  