Chapter 243 [Fierce Battle] (for Subscription)

Yenching, Huaqing University.

In the computer room classroom of the Mathematical Modeling Competition, there is no doubt that the team battle has already begun. The real thousand-regiment battle can even be said to be a ten-thousand-regiment battle. University teams from many provinces and cities across the country participate. Although there are junior colleges, undergraduates, and graduate students Group, but there are also a lot of graduate teams. You must know that in 2018, 12,207 graduate teams submitted papers.

This data is not a lot, but in fact, the winning rate of the mathematical modeling competition is still very high. For example, in 2018, according to the regulations of the competition, 1.5% of the 184 teams won the first prize, and 1588 teams won the second prize. The total number of second prize teams accounted for 14.5% of the total number of participating teams. The third prize was 2586 teams, a total of 4358 teams, with a winning ratio of 35.7%. Participation Award.

But it is obvious that Liu Zheng is not because of the participation award at all. You must know that they both won the second prize last year. Naturally, they hope to win the first prize this year.

"Then let's choose the last weather topic!"

Liu Zheng has now realized that it was definitely a very wise choice for him to find Lin Shu to form a team. As Lin Shu's roommate, no one knows more about how hard Lin Shu has been working than him.

That enthusiasm for learning really made him far behind, otherwise the students would not have the legend of Lin Shu's crazy learning of magic before.

Lin Shu was able to give a clear analysis of these two questions and tell the specific chapter location, he was surprised but took it for granted.

Cheng Xu also had no objections, and said, "Okay, then I'll leave the modeling to you two."

Cheng Xu is in charge of programming. Although he has also studied mathematics, he is obviously not as good as Lin Shu and Liu Zheng. The most important thing for him is to complete the part he is responsible for.

Lin Shu and Liu Zheng nodded.

Now at this time, Lin Shu naturally has no idea that he can lie down and win, and the atmosphere at the scene is also very tense. The teams participating in the competition from Huaqing University are also reading and choosing topics, and there will naturally be very powerful players in it. genius.

Since it's a real team battle, it's natural to fight recklessly!

"The second question seems to be that only a small number of videos are selected in the question, and some inherent features in the intercepted image are not used effectively. The continuous information estimation of the image is inaccurate."

Lin Shu nodded and said: "Yes, so here we need to add the continuous information time, speed of change and speed of the video data, etc. The time can be extracted from the upper left corner of the video. Because the given video is set to a fixed position. It was shot, so only the area and concentration of the fog changed. The extracted data includes image features, differences between images, temperature, pressure and other visibility data. We can use convolution, recursive neural network, etc. to build mold."

For Lin Shu to give the modeling direction so quickly, Liu Zheng had to give Lin Shu a thumbs up in his heart.

There are two more questions behind:

Third, a section of the expressway only has monitoring video data, and establishes a visibility estimation algorithm that does not rely on the observation data of the visibility meter (reminder: in fact, the depth of field of the object in the video can be estimated in a foggy situation [1]. Conversely, theoretically also Objects with different depths of field in the video can be used to estimate the visibility under different visibility), discuss the implementation process of related algorithms, and draw the visibility of the expressway during this period of time according to a video provided by the topic (highway video screenshot. zip) Curve over time;

4. Using the time-varying law of visibility obtained from Question 3, establish a mathematical model to predict the changing trend of the fog (intensify or weaken) and when it will dissipate (reach the specified visibility, such as MOR=150m)?

Lin Shu said: "The purpose of the third question is to compare and analyze the related algorithms in the future to find the most suitable model, and finally draw the visibility curve and use the airport video for detection."

"The fourth question is a prediction problem. Since the data given in the previous question is only 100, methods similar to neural networks are not applicable. We can use simple models such as time prediction or gray prediction to operate. "

Liu Zheng nodded, agreeing with Lin Shu's modeling direction very much.

It can be said that Lin Shu has given a general idea and direction for solving the problem, and it can be said to be a very good direction.

Undoubtedly, now is a very good start for Lin Shu's team, and the next step is to model, then program and write a thesis.

The other teams also began to select topics, and began to prepare to solve them one after another.

Lin Shu also devoted himself to modeling the mathematical problems of the project. As long as he has the right idea to solve the problem, he has a very clear direction. The rest is to express the data in the problem with mathematical formulas. come out.

Lin Shu also started mathematical modeling with Liu Zheng.

During the game, other teams also began to fight. Of course, in such game battles, there are many players who choose to cheat, such as seeking help from foreign aid, etc. Unofficial also provides ideas for solving problems, and even directly provides code, but the characteristic of the mathematical modeling competition is that although these problem-solving ideas are correct in many cases, they are not necessarily very exciting. Ordinary, if you use it, it will not be brilliant, it can only be guaranteed to be completed.

It is precisely for this reason that it is easy to win the third prize in the competition. If you solve it around the most common ideas and write a good paper, you can basically win the prize. To a certain extent, the competition The winning rate of 33% can be said to be very high.

As for the problem-solving direction given by Lin Shu, it is undoubtedly very exciting. The key is to do the best work in the future, especially Lin Shu is in charge of the thesis, because the judges will read the thesis in the end.

Writing a good thesis is based on a full understanding of the model and process, and it is also necessary to write the thesis so that the judges are interested in reading it, and the tables and pictures must be exquisite. These are not easy tasks. If you directly adopt the modeling ideas given on the Internet, and then go to csdn and Zhihu to find codes along the way, in fact, the tasks of modeling hands and programming hands are very light, and the most important tasks will fall on the thesis hands.

In a way, writing the dissertation is also the final critical link.

It is also for this reason that Lin Shu began to write the outline of the thesis at the beginning of modeling.

I don't know how the battlefields in other war zones are. The computer room where Lin Shu is located is undoubtedly very lively. Time passed without knowing it and no one left. Everyone is still fighting in their positions.

"I see that some people in the group have given different solutions to the problem?"

Cheng Xu looked at the unofficial QQ group on the mobile phone to discuss how to choose a topic, and there was a question about E in it, which seemed a bit specious.

"Don't look at that, it's just noise and it only disturbs us."

Liu Zheng is still very clear about this matter, and said directly: "One time before, someone asked how to reduce the dimensionality of data, and some people in the group said that of course manual screening is too funny, but it is also understandable. Your competitor is I don't want you to win an award."

There is no way, the battle is so dangerous, not only on the battlefield, but also below the battlefield, there is a lot of blood and rain, and the conspiracy is trapped.

Of course, the real strong will not care about those conspiracies, because there are no such noises in their hearts.

In such a fierce battle, some people will naturally choose to give up, but in the eyes of more players, persistence is the most important thing, and they will never give up until the last moment.

There are also some people talking about discouragement, no matter whether such words are a way for others to confuse the opponent, but in a really powerful team, there is no time to gossip everywhere, and there is not enough time to realize your own ideas. Have any extra thoughts.

"Shen Lin's solution to this problem is the best."

Liu Zheng couldn't help calling Lin Shu by the name "Lin Shen". Although he was able to give a solution to the problem, he had to admit that the solution Lin Shu gave was really fast. Good again.

Cheng Xu looked at Lin Shu and asked, "Lin Shu, why don't you rest for a while?"

Lin Shu didn't turn back, and kept checking the mathematical formula, saying, "No need."

Liu Zheng waved his hand to Cheng Xu, he knew how strong Lin Shu was, he was a real learning maniac, this kind of state was nothing to Lin Shu.

From Lin Shu's point of view, it was nothing more than a battle of questions.

Not to mention, there are still a lot of experience points to be collected in such battles. Lin Shu naturally didn't feel tired. On the contrary, he kept listening to the sound of the system to collect experience points, and his calculations flew off.

Isn't it just playing team battle games to gain experience, come on and earn experience!

【Ding! Congratulations to the player, you have fought in the mathematical modeling team battle for 1 hour, and obtained 1. experience +569; 2. gold coins +58. 】

...

【Ding! Congratulations to the player, you have continued to fight in mathematical modeling team battles for 2 hours, and you have obtained 1. experience +1259; 2. gold coins +120. 】

【Ding! Congratulations to the player, you have fought for 4 hours in the crazy mathematical modeling team battle and obtained 1. experience +3989; 2. gold coins +390. 】

...

Experience keeps going up.

The experience value of mathematical modeling team battles is very powerful.

Obviously, apart from Lin Shu's team, other teams are also fighting seriously.

Obviously, in such an important game, everyone is doing their best, but even if some people are doing their best, no one is paddling, or if the paddling is not obvious, it is not enough to be a surprise .

There is no intense artillery fire, and there are no various aggressive operations, but the battle is still very fierce.

At three o'clock in the afternoon, few people left.

At five o'clock in the afternoon, there were a few fewer people.

But at six o'clock in the evening, several people came again.

Just coming and going like this, until two o'clock in the morning, there are only a few people left in the computer room, and what they can't model and program is to explode their livers.

Liu Zheng and Cheng Xu couldn't take it anymore, so they went back to rest first.

Some students in other teams started to lose their spirits, couldn't concentrate, their heads were buzzing, their hands and feet trembled unconsciously, they couldn't bear it anymore, they fell down, and finally fell asleep lying on the table...

Lin Shu is still fighting.

At this time, someone saw Lin Shu still fighting there, looked at the opponent who was still fighting, and obviously knew that he couldn't sleep, so he tried his best to look at the computer screen, and someone asked: "Lin Shu, are you not going back? "

The students in other teams naturally knew Lin Shu, a divine man, and seeing that Lin Shu was still writing his thesis, they couldn't help asking.

Lin Shu nodded.

Seeing that Lin Shu didn't even intend to go back, the students in other teams were naturally unwilling to admit defeat, not to mention how the problem solving was, at least the attitude was not to admit defeat.

Well, let's fight, let's die together!

Lin Shu is so old, he can still stay up late, can't he?

Isn't it just staying up late?

Boil it!

Just so quietly, under the dark night, in the fierce battle, I don't know how many hairs died and drifted away with the wind...

Obviously, the choice of competition is three days, not longer. It may also be because players are afraid of sudden death due to excessive addiction to game battles. Three days may be just right. Many competitions in universities are three days, to prevent sudden death mechanism.

As for the crazy all-night overtime work of social animal workers, it is not just three days, but N days. That is because adults do not have a protection mechanism to prevent overtime addiction. What protection adults want, XX Law cannot protect them.

Cheng Xu and Liu Zheng rushed over early in the morning. They knew that Lin Shu hadn't gone back to rest, but when they first came here, Lin Shu had just come out.

"Are you two here?"

Lin Shu rubbed his eyes and yawned. He hadn't stayed up late for a long time, and said directly: "Liu Zheng, the model you wrote before can't be connected with his, and the data on both sides can't be connected. I've already changed it. Yes, the modeling of the third question has also been done. I also wrote some papers on modeling content. The rest depends on your programming. I still have class in the morning, so I can’t skip it. You should program and draw first, and I will come back in the afternoon Continue writing the rest of the paper..."

Because the thesis is not only about mathematical modeling, but also algorithm programming. Although Lin Shu understands it in general, he still needs to communicate with Cheng Xu. After all, the code is not so easy to write.

Hearing Lin Shu's words, Liu Zheng and Cheng Xu didn't know what to say for a moment. Why did they feel guilty and ashamed?

Is this what it feels like to hold your thighs and stride forward?

"Go back and rest quickly!"

Upon hearing Lin Shu's words, Liu Zheng hurriedly said, "We still have enough time, you should go back and have a rest."

Lin Shu naturally wants to go back to rest for a while, but he won't rest for long. Although he is very tired, he is still a man with [sleeping pills]. When the time comes, he will have a deep sleep for a while, and he will be able to recover his energy and continue to fight with full blood .

Seeing the back of Lin Shu leaving, Cheng Xu couldn't help but said to Liu Zheng, "It's really great that you asked him to form a team together."

Team battles need such immortal players, and it is best to be able to take them to fly.

Now Lin Shu is leading them to fly, he is not playing the support position, he is in the jungle, he is in the top lane, he is in the mid laner, he is in the shooter...

Well, he's everywhere.

I hope you can support me a lot! !