message: Add an accuracy op
diff: @@ -358,6 +358,9 @@ def model_fn(features, labels, mode, params, config):
  metric_ops = {
  + 'accuracy': tf.metrics.accuracy(labels=labels['pi_tensor'],
  + predictions=policy_output,
  + name='accuracy_op'),
  'policy_cost': tf.metrics.mean(policy_cost),
  'value_cost': tf.metrics.mean(value_cost),
  'l2_cost': tf.metrics.mean(l2_cost),
  