Update plot.py due to the clear() function causes Figure is not showing in Jupyter Notebook (!17192) · 合并请求 · PaddlePaddle / Paddle

Update plot.py due to the clear() function causes Figure is not showing in Jupyter Notebook !17192

Created by: VictorZhang2014

clear()函数会清空Figure对象，导致在Jupyter Notebook中不能显示绘图（尤其是在AIStudio里的Jupyter Notebook），我们可以显示的调用close_plot()这样的函数来清除Figure对象，释放内存