'_train_batch.
Train on a single batch.
Arguments:
feed_dict: `dict`. The data dictionary to feed.'

def _train_batch(self, feed_dict):

    tflearn.is_training(True, session=self.session)
    (_, loss, _) = self.session.run([self.train, self.loss, self.summ_op], feed_dict=feed_dict)
    tflearn.is_training(False, session=self.session)
    return loss
