带有TextLineDataset的partial_run（）引发CancelledError：运行调用已取消

Question

我在这里稍微修改了nmt（https://github.com/tensorflow/nmt/blob/tf-1.4/nmt/model.py#L227）

partial_setup = sess.partial_run_setup([self.train_logits, self.train_op_dummy_reward, self.train_loss, self.predict_count, self.train_summary, 
        self.global_step, self.word_count, self.batch_size], [self.rewards])
      scores = sess.partial_run(partial_setup, self.train_logits)
      rewards_output = self.calculate_rewards(scores)
      step_loss = sess.partial_run(partial_setup, self.train_loss, feed_dict={self.rewards: rewards_output})
      print('Loss value:', step_loss)
      r = sess.partial_run(partial_setup, self.train_op_dummy_reward)
      step_predict_count, step_summary, global_step, step_word_count, batch_size = sess.partial_run(partial_setup, [self.predict_count,self.train_summary, self.global_step, self.word_count,self.batch_size])
      return None, step_loss, step_predict_count, step_summary, global_step, step_word_count, batch_size

它运行一个纪元，并因错误而失败：

tensorflow.python.framework.errors_impl.CancelledError: Run call was cancelled

这种情况发生在

  train_sess.run(
      train_model.iterator.initializer,
      feed_dict={train_model.skip_count_placeholder: 0})

被称为（https://github.com/tensorflow/nmt/blob/tf-1.4/nmt/train.py#L260）。