"Teacher Li, this question is really... hahaha, you see how difficult it is for the students."
"No, when I just went to inspect the back, the student next to me was flipping papers and scolding him, hahaha, he made me laugh so hard."
"Hahaha, I heard it too. Listen carefully, it's still happening now."
"I just got the paper and read it. This set of questions is really difficult. Especially the last two questions are really too difficult for students. It is impossible to write them during the exam."
"The Schrödinger equation has been put in, and Dean Li is really ruthless. Hahaha, it would be strange if these students don't curse. Not only the last two questions, but also the previous questions are not simple. The calculation amount is within the exam time.
It’s even difficult to complete. If there are a few more twists and turns in the questions, hahaha, the scores of these students will probably be very bad again in this exam.”
"I'm afraid that this year's results will be even more exaggerated than in previous years. Look at these students scratching their heads. Look at the students in Math Class A over there. They all scratched their brows when they got the paper. This is written
After a while, I changed several pieces of draft paper, and I was sweating it out."
"Huh? Look at that student over there."
An invigilator raised his chin to signal.
"What's wrong?"
Another invigilator followed his gaze and looked over.
"The one with curly hair."
…
When Chen Mo got this set of questions, he felt nothing. These questions were not difficult for him. Questions that required a lot of calculations were what he was good at. But when he turned to the last two questions, he was stunned.
He remembered that Teacher Li had discussed these two issues with him before, but he seemed to be halfway through the discussion at that time. Because Teacher Wen and the seniors had things to deal with, he temporarily left and was busy with Teacher Wen's matters. Later,
I seem to have forgotten this.
I didn't expect to see these two questions on my final exam.
After Chen Mo was stunned for a moment, he smiled helplessly.
He raised his hand and looked at the time on his watch. He didn't just have one major, and he didn't just take exams for freshman year. The time between all the exams was quite tight. His next exam for Information Engineering was in an hour.
That's when it started. If you're late for fifteen minutes, you won't be allowed in. If you rush here, plus the time to go upstairs, it will take at least fifteen minutes. He doesn't want to be late.
Therefore, it is best for him to finish his math test within forty-five minutes.
He looked at it and found that this set of questions was not difficult, but the last two questions might take a long time.
Writing these two questions would require at least tens of thousands of words, and he couldn't finish them during the exam without typing. In order to catch up with the next exam, he planned to simplify it a little and deduct some points when the time came.
Just deduct some points. There is nothing you can do.
Because basically everything he has done this semester is related to a large amount of calculations. He has just returned from the research institute, and he can be said to be very comfortable with such calculation-type questions related to computer algorithms.
Basically when the exam bell rang, he just started writing and wrote down the answers to several mental calculation questions that he had done when reading the paper. Basically, after looking at a question for a while, he could give the answer directly. This semester started.
He still has to use scratch paper to assist him when doing math, but there have been so many opportunities to practice arithmetic this semester that he can now basically complete a large part of the calculations in his mind alone.
It has to be said that when writing mathematics, it saves pen oil and time. Compared with Ma Zhe two days ago, the large number of words covering the entire page of Yigui used up several of his pens. Today's mathematics is much kinder.
.Basically, it’s just a bunch of fill-in-the-blank questions, and just write down the results.
Less than ten minutes had passed on the clock hanging in the center of the front of the classroom. Chen Mo had already replaced two papers. There was not even a draft on the scratch paper. It was not until the penultimate paper had a section that the calculation amount was indeed relatively large.
I made two strokes on the scratch paper.
After another five minutes passed, I had finished writing all the questions except the last two big questions.
Look at the last two questions.
BP neural network and apriori algorithm activation function and cost function, examine the possibility of Schrödinger equation and its solution in polar coordinate system and elliptical coordinate system.
Chen Mo turned around and scratched his head with the pen cap. He was actually a little helpless. He encountered this kind of question during the exam, especially after writing countless words in the past two days, seeing this kind of question requires a lot of elaboration.
It was also quite helpless, it was too time-consuming to write. He knew that he had to take a lot of tests, so he prepared a lot of pens in advance before the exam. He shook it and looked at the scale bar of the large black pen in his hand.
One-third of the pen and ink is empty.
"well."
I sighed. I was afraid that after finishing these two questions, I would have to go to the canteen to get two pens before I could rush to the next examination room.
I glanced at the first question: Artificial neural network originates from the human brain neural network in physiology. It originally referred to the brain neurons of organisms, which control the behavior of organisms. People imitated the functions of brain neurons to establish artificial neural networks...
'Neural network is a parallel distributed information processing structure, interconnected by processing elements and unidirectional signal channels, and is a computer system capable of processing information.'"
Chen Mo simply scanned the large amount of introductions on the paper. These were all areas of his research. After looking at the set conditions, he started writing directly.
"Basic model of artificial neurons: As shown in Figure 1, artificial neural networks are composed of multiple neurons, generally consisting of multiple inputs and one output. x1, x2, xn represent input signals, yj represents the output of the neuron, and wij represents the input
The weight between signal x1 and neuron j. bj represents the offset of the neuron, f(.) is the activation function. Suppose the net input value of the jth neuron is sj: then there is the following... It can be proved that f(
.) is a monotonically increasing function and a bounded function...
bp The 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, the neurons in each layer only affect the state of the neurons in the next layer...
...Backpropagation is performed based on the error function and using the gradient descent method, so the most important thing in backpropagation is the error function..."
Chen Mo calculated and elaborated at the same time. Needless to say, the blank space left on the test paper was not enough to write on. One side of the test paper was filled up. Fortunately, when Chen Mo wrote the previous questions, he did not use scratch paper. There were two blank A3 sheets.
He used the manuscript paper 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. Even if there are more hidden layers, the entire neural network will not be the same as a single layer.
Neural networks are equivalent. By adding activation functions, neural networks have hierarchical nonlinear mapping learning capabilities. The optimization method of the bp algorithm is based on gradients, and the activation function must be differentiable 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 is, and vice versa..."
I have to say that Chen Mo's writing speed is still as fast as ever. He even accelerated it because he was in a hurry this time. In the past, when he was not in a hurry, his hands were very light. Even if he wrote very fast, his surroundings were too audible.
Clear the voice. Maybe I was in a hurry this time, and the surroundings were indeed quite quiet, so Chen Mo's swishing sound seemed a bit obvious.
Everyone else was also writing and drawing on the scratch paper, but they were all a bit irritable, so the scratching sounds came in bursts. Only Chen Mo's side looked a little different. There was always the sound of writing here, and
Shashasha’s voice was so steady that those who didn’t know better thought she was writing a composition.
The students around me who had been stuck on the question for a long time were full of doubts. They didn't know what the person next to them was doing. They raised their heads and looked at the time. Less than twenty minutes had passed since the exam. The difficulty of this exam was really extraordinary.
It's a big, many capable person, but now they haven't even turned over the first side of the test paper.
Isn't this guy driven crazy by Teacher Li's test questions this time?
What is this "sashasa" doing?
They had heard the sound of writing here since just now. They didn't think anything of it at first, and they just thought that there were questions at the back of the paper that required a lot of writing. As a result, they didn't see such a question after writing for a long time. Some people turned back in doubt.
I looked through the test paper and searched for a long time, but I really didn’t see any questions that required a lot of writing. Basically, there was too much calculation.
There were even many confused students who couldn't hold it back because they were sitting behind Chen Mo and not far away from him. They didn't bother to take the exam. They raised their heads and pretended to look at the time, but in fact they turned their heads to use their spare time.
Just look at Chen Mo and see what he is doing.
Then I saw the draft paper handed out with the exam papers on Chen Mo's desk. One of them had been covered with dense writing. Because it was far away, I couldn't see what was written specifically. I just thought it was strangely neat and it didn't look like it was typed.
's draft.
In connection with the voice I just heard, it really feels a bit like writing a composition.
Is this guy really crazy?
I couldn’t figure out the question and collapsed, so I just wrote a short composition to “pay tribute” to the teacher?
Maybe he inadvertently pretended to look up at the time, but in fact too many people were secretly looking at Chen Mo, and the teacher who was in charge of the exam also noticed it.
"Ahem, cough, cough, look at your own papers, don't look around."
The teacher invigilating the exam coughed a few times and reminded him seriously.
After hearing this, everyone withdrew their gazes, but without the teacher reminding them, they had no intention of looking any further. After checking the eyes, they found that it was a person who was driven crazy by Teacher Li.
Before they even finished calculating the topic, they started to feel dizzy. They knew very well the mentality of the buddy who might have written a small essay on the scratch paper, and now they also wanted to curse a hundred or eighty thousand words.
After they stopped paying attention to Chen Mo, they all lowered their heads and started writing their own papers seriously.
The two invigilators looked at each other.
He glanced at Chen Mo several times.
When they first started to invigilate the exam, they noticed Chen Mo and thought this student was a bit strange. When the exam bell rang, other students were anxious to turn over the papers, and they were all in a hurry. Only he was there when the bell rang.
, and he began to write and answer the questions without any haste.
The feeling was indescribable, it was quite abrupt among the crowd, and it was incompatible with the collapse, heat, and tense atmosphere in this examination room.
Ever since the two invigilators laid their eyes on Chen Mo, they never looked away.
They looked at Chen Mo helplessly, changing the paper as he wrote, changing the paper as he wrote, and changing the paper as he wrote...
The invigilator who was relatively close to the first row took two steps forward and looked down at the test papers of several candidates in the first row. He had just started to turn over the second page. Everyone else in the classroom was in a similar situation. Hurry up.
Turn over and write on the back of the first paper.
If the position where Chen Mo was sitting was not in the row facing the podium, and there was no aisle in the middle, making it difficult to patrol, they would have had to go there to see what was going on. Fortunately, after looking through it several times before,
The student finally stopped and, like the classmates next to him, calmed down and worked on a paper.
But this situation has not improved for a long time. In the quiet examination room, the only thing that can be heard is "swish, swish, swish" coming from one student, just like the intensive and rapid friction between the pen tip and the paper when writing intensively in the Chinese language test of the college entrance examination.
sound.
This time, it was not just the invigilators who noticed it. The sudden sound also attracted the attention of the candidates, who all turned their attention to it.
After coughing a few times to stop the candidates.
One invigilator said to another,
"You look at the others, I'll go over and check on the situation."
Even if Chen Mo's position was really not easy to get over at this time, they still had to go and have a look.
"...When the ratio of the semi-major axis and the semi-minor axis of the ellipse is a/b=4, the probability density distribution of electrons in the elliptical quantum line with a cross-sectional area equal to 400^2 is solved numerically under the action of the elliptical boundary constraint potential.
From the two-dimensional Schrödinger equation, the eigenvector ψ can be obtained, and then the probability density |ψ|2...
The computer simulation function studied the solution of the Schrödinger equation under different two-dimensional constraints... and reasonably explained its rules."
"call--"
Finally finished.
Unsurprisingly, as he had expected, 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 tip of his pen 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 the last two days were written briefly, there was plenty of time, enough time to go to the supermarket.
Their school had no restrictions on whether to submit papers in advance, and Bai Yitong was there, so Chen Mo straightened up and stood up.
"Classmate, what are you doing?!"
Originally, the invigilator came over and wanted to see the situation. He was walking here and wanted to look over at Chen Mo.
As a result, Chen Mo suddenly stood up and was shocked.
Chen Mo was also stunned for a moment. He didn't expect the teacher to be so close to him. He originally wanted to raise his hand.