This passerby is too calm

Chapter 353

"Ms. Li's question is really... Hahaha, it's difficult for the students."

"No, when I went to the back to inspect, the student next to me was flipping through the papers and cursing, hahaha, I couldn't laugh."

"Hahaha, I heard it too. Listen carefully, there are still more."

"I just got the test paper and read it. This set of questions is really difficult, especially the last two questions, which are really too difficult for the students. It is impossible to write them during the exam."

"The Schrödinger equation is put on, and Dean Li is really ruthless. Hahaha, it's no wonder this group of students don't scold their mothers. Not only the last two questions, but the previous questions are also not easy, and the amount of calculation is within the time of the exam. It’s hard to finish. If there are a few twists and turns in the question, hahaha, this group of students’ grades in this exam may be skyrocketing again.”

"I'm afraid that the results will come out this year. I'm afraid it will be more exaggerated than in previous years. Look at these students scratching their heads one by one. Look at the students in Math A class over there, and they are all scratching their brows when they get the papers. After a while, several sheets of draft paper were changed, and Khan wrote them all down."

"Huh? Look at that student over there."

An invigilator raised his chin as a signal.

"what happened?"

Another invigilator looked over along the line of sight.

"Just the one with the curly hair."

……

When Chen Mo got this set of questions, he didn't feel much. These questions are not difficult for him. This kind of questions that require a lot of calculations is what he is good at.It's just that when I turned to the last two questions, I was stunned.

He remembered that Mr. Li had discussed these two issues with him before, but he seemed to be in the middle of the discussion at that time, because Mr. Wen and the senior had something to deal with, so he temporarily resigned and went to Mr. Wen's affairs. It seems to have forgotten this.

I didn't expect to see these two questions on my final exam.

After Chen Mo was stunned, he smiled helplessly.

He raised his hand and looked at the time on his watch. He had more than one major, and he didn’t just take the freshman exam. It just started, and you will not be allowed to enter the venue if you are 15 minutes late.It will take at least 15 minutes to rush over here and the time to go upstairs. He doesn't want to be late.

Therefore, the math test on his side should be completed within 45 minutes.

He looked at it and found that this set of questions is not difficult, but the last two questions may take a lot of time.

Writing these two questions would take at least tens of thousands of words, and he couldn't finish writing even if he wasn't typing during the exam time.In order to catch up with the next exam, he intends to simplify his writing a little bit, and deduct some points when the time comes.There is no way.

Because basically everything he did this semester was related to a lot of calculations, and he just came back from the research institute. He can say that he is very comfortable with this type of calculation related to computer algorithms.

Basically, when the exam bell rang, he just wrote down the pen and wrote down the answers to the few questions he had mentally calculated when he was reading the paper.Basically, after looking at a question for a while, you can give the answer directly.At the beginning of this semester, he still needs to use scratch paper to assist him, but there are too many opportunities to practice arithmetic this semester, and he can basically complete a large part of the calculations in his mind now.

I have to say that when writing mathematics, it saves pen and oil and saves time. Compared with Ma Zhe and Yiguan who spent a lot of words covering the entire scroll two days ago, he wasted several pens. Today's mathematics is much more gentle. .Basically just a bunch of fill-in-the-blank questions, just write a result.

Less than 10 minutes passed by the clock hanging in the middle of the front of the classroom, and Chen Mo had already exchanged two papers.There was not even a draft on the draft paper, and it was not until the penultimate paper that the amount of calculation was indeed relatively large that he drew two strokes on the draft paper.

After another 5 minutes passed, I had finished writing all the questions except the last two big ones.

Look at the last two questions.

BP neural network and Apriori algorithm activation function and cost function, investigate the possibility of Schrödinger equation and its solution in polar coordinate system and elliptic coordinate system.

Chen Mo turned his pen and scratched his head with the cap of the pen. In fact, he was a little helpless. He encountered this kind of question during the exam, especially after writing a lot of words in the past two days. It's also quite helpless, it's too expensive.He knew that he had a lot of exams, so he prepared a lot of pens in advance before the exam, shook it, and saw that the scale bar of the large black signature pen in his hand was one-third empty.

"Ugh."

Sighing, I am afraid that after finishing these two questions, I have to go to the canteen to get two more pens before rushing to the next examination room.

Glancing at the first question: The artificial neural network is derived from the human brain neural network in physiology. It first refers to the biological brain neurons, which control the behavior of living things. People have established artificial neural networks by imitating the functions of brain neurons... 'Neural network is a parallel distributed information processing structure, which is a computer system capable of processing information by interconnecting processing elements and unidirectional signal channels. '"

Chen Mo simply scanned the large number of introductions on the scroll. These are all his research fields. After looking at the set conditions, he wrote directly.

"Basic model of artificial neuron: As shown in Figure 1, the artificial neural network is composed of multiple neurons, generally with multiple inputs and one output, X1, X2, and Xn represent input signals, Yj represents the output of neurons, and Wij represents the input The weight between the signal X1 and the neuron j. Bj represents the offset of the neuron, and f(.) is the activation function. Let the net input value of the jth neuron be Sj: Then there are the following... It can be proved that f( .) is a monotonically increasing function and is bounded...

The BP neural network algorithm consists of two processes: forward propagation and error back propagation.During forward propagation, from the input layer to the hidden layer and then to the output layer, each layer of neurons only affects the state of neurons in the next layer... Backpropagation is performed according to the error function and using the gradient descent method, so the inverse The most important thing in propagation is the error function..."

While calculating, Chen Mo expounded. Needless to say, the blanks left on the test paper were not enough to write, and the test paper was completely filled.Fortunately, when Chen Mo wrote the previous topic, he didn't use draft paper much.Two blank A3 manuscript papers were used by him as answer sheets.

"The main function of the activation function is to improve the nonlinear modeling ability of the neural network. Because it involves nonlinear modeling and lacks an activation function, the neural network can only express linear mapping. The neural network is equivalent. Adding the activation function, the neural network has the ability to learn hierarchical nonlinear mapping. The optimization method of the BP algorithm is based on gradients, and the activation function must be derivable everywhere...

The cost function is used to measure the relationship between the predicted value and the actual target value, the closer the two are, the better the prediction effect, and vice versa..."

It has to be said that Chen Mo's writing speed is still as fast as ever, even because he is in a hurry this time, the speed has been accelerated. In the past, when he was not in a hurry, his hands were very light. Even if he wrote quickly, the surroundings were too audible clear voice.This time, he might be in a hurry, and the surroundings are indeed quite quiet, so Chen Mo's rustling sound is a bit obvious.

Others were also writing and drawing on the draft paper, but they were somewhat irritable, so the sound of scratching was intermittent, only Chen Mo seemed a little different here, the sound of writing was always there, and Sa Sasha's voice was so steady that those who didn't know it thought she was writing a composition.

The students around me who were stuck on the questions for a long time were full of doubts at this time. They didn't know what the person next to them was doing. They looked up at the time. The exam was less than 10 minutes past. The difficulty of this exam is really not ordinary. Many of them are big, and many of them are strong. Now they haven't even turned over the first side of the test paper.

Could this buddy be driven crazy by Teacher Li's test questions this time?

What is this "Sa Sa Sa" doing?
I have heard the voice that has been writing here since just now.They didn't feel anything at first, and they just blindly thought that there were questions at the back of the paper that required a lot of writing, but they didn't see such questions after writing for a long time.Some people looked back through the test papers suspiciously. After searching for a long time, they really didn't see any questions that required a lot of writing.Basically, it is too much calculation.

There are even many students who are confused, because they are sitting behind Chen Mo, and there is a position not far from his side. Just look at Chen Mo to see what he is doing.

Then I saw the draft paper on Chen Mo's desk that was handed out together with the exam papers. One of them had been covered with densely packed words. Because it was far away, I couldn't see what was written clearly. draft.

When it comes to the voice I just heard, it's really a bit like writing a composition.

Isn't this guy really crazy?

Can't figure out the problem, collapsed, just write a small composition to "pay tribute" to the teacher?

Maybe they pretended to look up at the time inadvertently, but in fact, there were too many people secretly looking at Chen Mo, and the teacher invigilating the exam also noticed it.

"Ahem, cough, look at your papers, don't look around."

The invigilating teacher coughed a few times and reminded seriously.

Everyone turned their eyes back after hearing the words, but the teacher didn't remind them and didn't want to look any further.After confirming the eyes, it was a person who was driven crazy by Mr. Li.

They started to get dizzy before the topic on their side was finished. They knew very well the heart of the buddy who might write a small composition on the draft paper, and now they also want to scold a hundred and eighty thousand words.

After they stopped paying attention to Chen Mo, they all bowed their heads and wrote their papers seriously.

The two invigilators looked at each other.

He glanced at Chen Mo several times.

When they first started proctoring the exam, they noticed Chen Mo and thought this student was a bit strange.When the exam bell rang before, the other students were anxious to turn back the papers, and they were somewhat in a hurry. Only when the bell rang, he began to write and answer the questions leisurely.

That kind of feeling is indescribable, it is quite abrupt in the crowd, and it is incompatible with the collapsed, hot, and stern atmosphere in this examination room.

Since the eyes of the two invigilators fell on Chen Mo, they haven't moved away much.

They watched Chen Mo helplessly, they changed a paper while writing, changed another paper while writing, and then...

The invigilator, who was closer to the first row, took two steps forward, looked down at the test papers of the candidates in the first row, and had just started to turn over the second side, and everyone else in the classroom was in the same situation.Hurry up and write on the back of the first paper on the other side.

If it wasn't for the seat where Chen Mo was sitting, it happened to be in the row directly facing the podium, and there was no aisle in the middle, so it was difficult to patrol there, and they would have to go there to see what was going on no matter what.Fortunately, after flipping through it a few times before, the student finally stopped, and calmed down like the students next to him to make a paper.

But this situation has not been good for a long time. In the quiet examination room, only the "shua, shua, shua" from a student can be heard, just like the intensive and rapid friction between the pen tip and the scroll surface during the Chinese examination of the college entrance examination. sound.

This time, not only their invigilators noticed, but the abrupt voice really caught the attention of the examinees, who all turned their attention to it.

After coughing a few times to stop the candidates.

One invigilator said to the other,

"Look at the others, I'll go over and see the situation."

At this time, even if Chen Mo's position is really not easy to pass, they have to go and have a look.

"...When the ratio of the semi-major axis to the semi-minor axis of the ellipse is a/b=4, the probability density distribution of electrons in the elliptical quantum wire with a cross-sectional area equal to 400^2. Solve numerically under the action of the elliptical boundary constraint potential The two-dimensional Schrödinger equation can obtain the eigenvector ψ, and then calculate the probability density |ψ|2...

The computer simulation function investigates the solution of the Schrödinger equation under different two-dimensional constraints...and provides a reasonable explanation for its laws. "

"call--"

Finally finished writing.

Not surprisingly, as he had expected before, he could tell by looking at the scroll. The further he wrote, the lighter the handwriting became. In the end, he almost ran out of ink. Fortunately, he finished writing before the pen ran out of water.

Chen Mo tapped the pen tip lightly on the scroll, put down the pen in his hand and let out a long breath.

I raised my watch and looked at the time. Fortunately, because I wrote briefly in the last two days, I have enough time to go to the supermarket.

Their school has no restrictions on whether to submit papers in advance, and Bai Yitong was there, so Chen Mo packed up and stood up.

"Student, what are you doing?!"

Originally, the invigilator came here and wanted to see the situation. He was walking here and wanted to look at Chen Mo.

As a result, Chen Mo stood up suddenly and was startled.

Chen Mo was also stunned for a moment, he didn't expect the teacher to be so close to him, originally he wanted to raise his hand.

"Teacher... Teacher, I will hand in the paper."

(End of this chapter)