Created by: OliverLPH

线性回归的示例代码中，主循环里使用了 plot_prompt调用了 ploter中使用了“basestring”。然后报错未定义 “basestring”，因为python3没有basestring。

报错如下

for pass_id in range(num_epochs):
    for data_train in train_reader():
        avg_loss_value, = exe.run(main_program,
                                  feed=feeder.feed(data_train),
                                  fetch_list=[avg_loss])
        if step % 10 == 0: # 每10个批次记录并输出一下训练损失
            plot_prompt.append(train_prompt, step, avg_loss_value[0])
            plot_prompt.plot()
            print("%s, Step %d, Cost %f" % 
                      (train_prompt, step, avg_loss_value[0]))
        if step % 100 == 0:  # 每100批次记录并输出一下测试损失
            test_metics = train_test(executor=exe_test,
                                     program=test_program,
                                     reader=test_reader,
                                     fetch_list=[avg_loss.name],
                                     feeder=feeder)
            plot_prompt.append(test_prompt, step, test_metics[0])
            plot_prompt.plot()
            print("%s, Step %d, Cost %f" %
                      (test_prompt, step, test_metics[0]))
            if test_metics[0] < 10.0: # 如果准确率达到要求，则停止训练
                break

        step += 1

        if math.isnan(float(avg_loss_value[0])):
            sys.exit("got NaN loss, training failed.")

        #保存训练参数到之前给定的路径中
        if params_dirname is not None:
            fluid.io.save_inference_model(params_dirname, ['x'], [y_predict], exe)

---------------------------------------------------------------------------

NameError                                 Traceback (most recent call last)

<ipython-input-8-4379eae5beee> in <module>
      5                                   fetch_list=[avg_loss])
      6         if step % 10 == 0: # 每10个批次记录并输出一下训练损失
----> 7             plot_prompt.append(train_prompt, step, avg_loss_value[0])
      8             plot_prompt.plot()
      9             print("%s, Step %d, Cost %f" % 


/anaconda3/lib/python3.7/site-packages/paddle/utils/plot.py in append(self, title, step, value)
     73                 plot_curve.append(title="Curve 1",step=1,value=1)
     74 	"""
---> 75         assert isinstance(title, basestring)
     76         assert self.__plot_data__.has_key(title)
     77         data = self.__plot_data__[title]


NameError: name 'basestring' is not defined