Chapter 295 (1/2)
Suddenly, large-scale cross domain learning.
When I didn't learn, I felt terrible.
And once you really learn.
It's just more terrifying.
What Li Zheng has to deal with is not an exam, but a real one.
His first step is to reach the level of Bachelor of computer science.
As an old programmer, this is not difficult.
The second step is to reach the master's level of machine learning.
This
It's not that hard.
However, master's degree is also divided into fishing master's and big man's master's.
As a master of fishing, you can pass the exam and graduate smoothly. If you have a big difference, you can find a job.
As for the master's degree, we should master a lot of core knowledge of this major in the learning stage.
Including but not limited to probability theory, statistics, approximation theory, convex analysis, algorithm complexity theory
Among them, the requirements for mathematics have exceeded the sum of all competitions Li Zheng participated in before, which is equivalent to the learning amount of 80 biological national gold medals.
Under the pressure of mathematics at this level, Li Zheng's study time in his early 100 hours a day is not enough, which should have been even worse for Zhuangzi.
Unexpectedly, in this desperate intensity of learning, a little bit of learning movement, which was very unintentional, played a role.
[learning talent: mathematical brain]
[in thinking, we can transform problems into mathematical problems as much as possible, and complete possible calculations with terrifying neural efficiency. 】
This talent of reconstructing mathematical thinking under the guidance of solving the disputes, Li Zheng could only feel this talent in mental calculation and quick calculation before, and his initial intuitive feeling was just to enhance his computing ability.
But at this time, with the deepening of mathematical research, we sneaked into various groups and watched some masters and doctors communicate with each other. Only then did we find that the difficulties such as Cholesky decomposition, Laplacian matrix and normalized Laplacian matrix, which have been bothering us for a long time, are just pushing the boat and solving them easily.
On the other hand, as the foundation of mathematics becomes more and more thick, looking back on the existing algorithms given in the 11th Research Institute, it will naturally become more and more smooth, and occasionally some optimization ideas will burst out.
Unknowingly, what he said when he first met and solved the dispute did not fade with time, but became more and more clear -
”to learn mathematics well is not only a competition, but also an important thing in the future.”
Yes, Mr. Xie.
However, even if you learn the master's level, it is only the second step.
The third step is practical application, can use these knowledge to participate in the work, the actual improvement of fault diagnosis algorithm.
This requires a lot of project experience to accumulate, to really 996 half a year to calculate the entry.
But for some people, you're still crawling in the door, and she's like a monster, and she doesn't know when to get in.
[there is a monster, every time you step on a layer, you find her still on top of you. 】
[- Lin Yujing demon]
after learning the contents less than 120 of Li Zheng, Lin qiojing sent [engine fault optimization based on xgboost and auto regression model] and [fault diagnosis of liquid rocket engine based on comprehensive fuzzy clustering algorithm] to Li Zheng at 5:50 p.m. on the third day of practice.
”I I haven't learned yet... ” Li Zheng looked at the patchwork of algorithm documents, holding the mouse hand a little shaking, ”do you know what these things are?”
”I don't know all about it, but I don't need to know the details.” Lin Qijing kindly helped him pull the document down to the bottom. ”The following are some related papers. I only use them based on the conclusion. It's hard for you to understand.”
”It's going to take a week for either one to figure it out, OK?”
”Ah, why not?” Lin Yujing said with a smile, ”didn't you finish three books in one day? Can't I learn from you? You are learning ~ ~ ”
” Damn it, then learn. ” Li Zheng clenched his teeth and said, ”don't you deceive me. Are these two directions feasible?”
”At least better than the ones now.” Lin Qijing pointed to a row of papers on the screen and said, ”the premise is that the data and results of these papers are not filled with water.”
”Good.” Li Zheng rolled up the sleeve pipe, ”strive to understand today, and then find eleven to a test server.”
”In addition, it's also possible for you to do PSO optimization in the existing system.” Lin Qijing mouse moved another document, ”these are the papers and technical documents you need, I didn't take a close look.”
”Enough, enough...” Li Zheng hurriedly said, ”let's start with these three roads...”
”That's it? I'm going to do negative selection. And, have you learned about morphological typing? ” Lin's eyes narrowed, ”I can't feed you.”
”If I'm full, I'm going to break up.” Li Zheng quickly waved his hand, ”go and play with mine sweeping.” By the way, my mother helped with the construction of science and technology in Africa recently. What did my father take part in There is no one in the family for three or four days. Wangcai may be starving to death, or he will drown in his own excrement. He has time to take care of it. ”“！！！” Lin Qijing suddenly collapsed, ”you How can you bully her like this... ”
”I also want to go back and take care of it, but only here has an intranet and can connect to the test server.” Li Zheng said that he took out a bunch of keys from the bag and patted them on the table, ”here are the keys. Help me see if she has any vital signs.”
”I I'll go to your house myself... ” Lin qiojing looked at the straight man's key chain with pure iron rings. After tangled for a moment, he suddenly lifted it away again. ”It's all for the cat. Don't think much about it!”
”When is it? Where do you want to think about something else?” Li Zheng this return to the screen, just code two lines suddenly turn head, ”by the way, don't turn my drawer.”
When Lin Qijing heard the speech, he quickly recited his schoolbag: ”don't turn it or not ~”
”no way Your expression has been completely exposed... ” Li Zheng got up and wanted to grab the key. ”Give it to me. I'll take that little key down...”
Lin Qijing instantly protected the key and ran away with a kick.
”I know how to take care of my cat cat.”
”dry...” Li Zheng angrily sat back to his work station and muttered, ”forget it In any case, sooner or later we will know... ”
……
At the same time, one hospital, one office building, zero routine meetings were held as scheduled every half week. The meeting was held by Zhao Zhenhua, presided over by Chen Hongbing, and participated by Shen Tinglan and other team leaders.
As in the past, each group reported progress towards zero.
As in the past, Zhou Chenglong, the technical team, was the first to report.
Although sleepy and tired, he still patted off the hair that had been broken on his scalp and spoke with full spirit.
”The data analysis work of the technical group is nearing the end, 87% of the planned progress has been completed, and the lead time is about one and a half days.”
”Up to now, we have jointly proposed two kinds of probable rate fault models and four kinds of medium probability fault models together with the Sixth Research Institute.”
”Of the six fault models, five are pure engine faults, and four have been tested by the Sixth Research Institute, and one of them has basically completed the recurrence of huang-2 fault.”
”The last failure model is caused by the overall design of the rocket. We need to start the test at the western suburb test site, and apply for test start-up preparation here.”
Zhao Zhenhua suddenly asked, ”what is the basic completion of fault recurrence? Explain the basics. ”
Zhou Chenglong pointed out: ”in the recurrence of the fault, the parameters of the engine are basically consistent with the situation before the shutdown of Huang Er, but not completely. After all, the actual lift off situation is more complex, and the data of each lift off will be different.”
”I'll ask you another way.” Zhao Zhenhua then asked, ”what is the probability that this fault model really conforms to the previous accident?”
”More than 60 percent,” Zhou said
Zhao Zhenhua's look dropped visibly. He wanted to say something, but he also knew that everyone was not easy and didn't want to hit people.
”Secretary Zhao...” Chen Hongbing explained, ”because Huang er's arrow has not been recovered, we can only use various models to reproduce the accident. Just like the black box in an aircraft accident, if we can't get the black box of the rocket, it will never be 100% sure of the cause of the accident. 60% is really low, but the limit is about 80%
”How can we get the question of 60% Zhao Zhenhua clapped his hands and said, ”when it comes to the zero review group, we can't say it's Zhou Chenglong's personal judgment?”
Hearing this, Chen Hongbing hastily winked at Shen Tinglan and asked her to speak.
Shen Tinglan opens his mouth.
”There is a set of pass standards for the review of fault recurrence.”
”Simply put, it is to mathematically compare the data of the fault recurrence with the data in the actual accident, and finally get a recurrence accuracy rate.”
”According to the data standard of fault recurrence, it can only reach 60% for the time being.”
”But as far as I'm concerned, I'm basically 99% sure of this accident model.”
”I understand that.” Zhao Zhenhua then nodded, ”I have seen this set of accident model, which is indeed very intuitive and in line with my experience in aerospace for so many years. However, the problem is that only 60% of it meets the evaluation criteria. Even if this is really the cause of the accident, it can not pass the review and the work can not continue.”
”It's not necessarily impossible...”
Shen Tinglan is about to say something when Chen Hongbing suddenly raises his hand and interrupts her. He turns to he Zhongrui.
”We have been working very hard recently. After the technical group's business, we will talk about it. The test group will report it first. After the report, we will go one group and take a break.”
Shen Tinglan didn't say any more, but Zhao Zhenhua also understood.
He Zhongrui, however, was suddenly called, a little flustered.
”The test team The overall maintenance work of the test site has been completed, and the test run can be carried out at any time. ”