专业英语W14:Overfitting
在test表现的很好，但是在真正测试训练上表现的不好。
Think of your own mind as a neural network. Overfitting can happen to your mind too. Tell me a story about it.
在疫情期间我在家学习驾照考试，现在在科目二的阶段。
I have been preparing for the driving license test during the “long winter holiday” and now I am in the second phase.(科目二)
I thought learning to drive was hard, but after getting familiar with the real car, I find that in order to pass the drive test, all I have to do is to keep some “key patterns” in mind and keep practicing to operate the car at those points. These key points refer to the precise time and angle to turn the steering wheel and some “fixed” distance in the rearview mirror.
After such repeated training, I achieve a good result in the driving test.
But when I drive under real circumstances, for instance ,each time I was required to put the car back into the garage at my home, I couldn’t find the fixed point I had been trained any more. As a result of which, unsprisingly, I failed to put the car back everytime at the beginning, because I needed to judge flexibly without those points.
The process of how to drive of my mind is just like training it as a neural network. I behave very well on the specific fixed setting points to get a high score of driving license test. However, my real driving skill is so poor that I almost fail each time to get the car to the right place. This is the overfitting problem that my mind come across. Because I have learned to pass the trainning test(driving license test) too well so that I am not able to pass the real test which, as to the driving license test example ,is to have real command of driving a car.
我发现在学车过程中，我只需要将一些关键点记住，重复机械式的工作即可。
这些关键点包括转动方向盘的时机，转动方向盘的角度和后视镜里的一些”固定”的距离。
在经过重复的训练后，我发现我就可以很好的在驾照考试中取得比较好的成绩。
但是在真正开车的时候，比如每次父亲接我回家需要将车倒入库中，我发现此时我无法找到我原来学到的固定的点，即需要我灵活判断的时候表现的不好。
即在驾校的train中做的很好，在真实test中做的很糟糕。这是一种过拟合。
