"Artificial intelligence is the technology trend of the future, but there are currently very few studies and courses in this area in China. I believe you all know about the topic of artificial intelligence and big data, so I will briefly talk to you about artificial intelligence. Several intelligent algorithms.”
Wang Donglai stood on the podium and lectured confidently and calmly to the students below.
Because Yao Qizhi’s request was agreed to, and artificial intelligence big data still needs the efforts of these Yao class students, this scene happened at this time.
There are not many students in Yao class, but each of them is the elite among the elite.
“Many people have heard of what artificial intelligence is, but they can’t explain it. In the end, they can only give an example from a movie.”
“Actually, artificial intelligence has been present in our lives for a long time.”
“For example, in the mailboxes we often use, spam filtering relies on artificial intelligence.”
"Many people think that artificial intelligence is an extremely advanced technology. In fact, they are wrong. No matter how advanced it is, Technology also starts from basic principles. "
"The principles of the algorithms I am about to talk about are simple and have been discovered and applied very early. I even learned them in middle school and used them in my life. It’s also very common.”
When Wang Donglai came here, the students below suddenly became interested.
Originally, they thought that Wang Donglai could teach mathematics in class. After all, Wang Donglai was most famous for his achievements in mathematics.
But they guessed wrong. What Wang Donglai was talking about was not about mathematics, but about artificial intelligence.
Being able to enter the Yao class, their IQ naturally does not need to be explained too much.
The future of artificial intelligence is naturally very clear to these students.
In addition, in the past two days, they are also aware of the news that Galaxy Technology has provided money and Wudaokou has established a research team, so they value artificial intelligence technology even more.
Seeing the students below looking at him intently, waiting for his story, Wang Donglai also felt a little emotional.
There has never been a student from Qingbei in Anshui County for decades, but there are thousands here.
Any one of them, placed in Anshui County or even Shangluo City, is a rare scholar.
After sighing in his heart, his expression remained unchanged and he began to tell.
“The first one, LinearRegression, is probably the most popular machine learning algorithm. Linear regression is to find a straight line and make this straight line fit the data in the scatter plot as closely as possible. point, trying to represent the independent variable x value and the resulting y value by fitting a straight line equation to this data, and then using this line to predict future values. ”
"The most commonly used technique for this algorithm is the least squares method, which calculates a line of best fit such that the vertical distance to each data point on the line is minimized. The total distance is the sum of the squares of the vertical distances of all data points. The idea is to fit the model by minimizing this squared error, or distance. ”
“The difficulty is not in getting the predicted value, but in how to be more accurate!”
“The second type, Logisticregression, is similar to linear regression, but the result of logistic regression can only have two values. , if linear regression is predicting an open value, then logistic regression is more like doing a yes or no question.”
Speaking of this, Wang Donglai specifically added: “Logistic regression is actually used in e-commerce companies like Hangzhou Mahe Goudong. platform, or on a food delivery platform like Hungry? which just received US$350 million in Series E financing this year. is the most appropriate, and can be used to predict users' purchasing preferences for categories. If you intend to join these companies after graduation, you can pay more attention to this aspect."
Wang Donglai said in a calm tone when talking about logistic regression. They don’t care about the importance of e-commerce platforms and takeout platforms.
Even the many students below could hear Wang Donglai's tone of indifference, or even displeasure, towards e-commerce platforms and food delivery platforms.
Without any time to think, Wang Donglai started talking again.
“The third type is the decision tree. If linear and logistic regression both end the task in one round, then the decision tree is a multi-step action, which is also used for regression and classification tasks. , but the scenario is more complex and specific . ”
“For example, if I face your class, how can I tell which students are good? If so, it would be a bit too rough.”
"Then, I can discuss separately from aspects such as homework, attitude, attendance, questions, etc. Each branched circle is called a node. At each node, questions about the data are asked based on the available features. , the left and right branches represent possible answers, and the final node corresponds to a predicted value. The importance of each feature is determined through a top-down method. The higher the node, the higher its attribute. For example, if I feel diligent It’s more important than grades, so the node of diligence is high.”
"The fourth type, NaiveBayes, is based on Bayes' theorem, that is, between two conditional relationships, it measures the probability of each class, and the x value of the conditional probability of each class."
“Explain Bayes’ theorem in non-terminology, that is, through the probability of B happening under condition A, we can get the probability of happening under condition B. The probability of A happening, of course, some other data must be introduced in this process to ensure that the conclusion is correct.”
“The fifth type, ArtificialNeuralNetworks, is essentially a set of weighted neural networks. The interconnected layers of edges and nodes are called neural Element, between the input layer and the output layer, multiple hidden layers can be inserted. The artificial neural network uses two hidden layers and also needs to deal with deep learning. "
"The working principle and brain of artificial neural networks. Similar in structure, a group of neurons is given a random weight to determine how the neuron processes the input data, by The neural network is trained on the input data to learn the relationship between the input and the output. "During the training phase, the system has access to the correct answers. If the network cannot accurately identify the input, the system adjusts the weights. With sufficient training, it will consistently recognize the correct patterns. ”
"One of the more interesting applications of neural networks is image recognition. If you are interested, you can also spend more time on this. If you find a job in the future, the salary will not be low."
said When he arrived here, Wang Dong took a look at the clock hanging in the classroom.
"Okay, get out of class is about to end. There are also algorithms such as dimensionality reduction, random forest, K-means, K-maximum algorithm, support vector machine, etc. that are not mentioned. You can look for information in advance after you go down. , study on your own.”
“I won’t give you any homework. Let’s take a good look at these algorithms that haven’t been taught yet. I’ll listen to your thoughts in the next class.”
< br>"Okay, get out of class is over!"
As soon as Wang Donglai finished speaking, the bell rang immediately.
He walked out of the classroom without any hesitation.
"Hey, is this the true strength of Wang Shen? This is only in the field of computers. If it is in the field of mathematics, I am afraid it will be even worse."
"I listened to one class like I'm crazy, do you feel this way? "
"I also feel this way, as if what Professor Wang said was directly instilled into my mind. Although there are many things that I don't understand very well, but inexplicably, Professor Wang's words You’ll understand after an explanation.”
"Professor Wang is only 21 years old this year, and he is actually our same age. The gap is really huge!"
"Oh, I don't know how Professor Wang's brain grew. It's really disappointing. Envy!”
After Wang Donglai left, the students in Yao class started discussing.
Actually, what they didn’t know was that during class, Wang Donglai activated the [Preaching and Teaching] skill. Otherwise, although these Yao Class students were carefully selected geniuses, You may not be able to keep up with and understand Wang Donglai’s teaching rhythm.
Wang Donglai did this for his own consideration. The higher the ability level of these Yao class students, the more complete and excellent the general artificial intelligence large model produced by Wudaokou will be.
...
After leaving the classroom, Wang Donglai did not go to the library or return to his room, but went straight to the space agency.
Two days ago, Chang'e-5 chief designer Yang Anchao called Wang Donglai and invited him to the space agency.
Invited by Academician Yang Anchao, Wang Donglai naturally would not refuse.
He already has ideas about aerospace, so he will not miss this opportunity. Today is the appointed time.
Soon, Wang Donglai arrived at the space agency.
Because he had made an appointment, Wang Donglai entered the space agency after registering.
Not long after, Academician Yang Anchao walked towards Wang Donglai with a smile on his face.
There was a person following Yang Anchao, it was Yang Shuai.
As soon as they met, Academician Yang Anchao said cheerfully: "Professor Wang, I finally meet you, a busy man. It's not easy to meet you."
If ordinary people hear an academician say this, I'm afraid I've already had random thoughts in my mind and thought it was an expression of dissatisfaction.
But Wang Donglai acted very calmly and said with a smile: "Academician Yang is joking, you are the pillar of the country. The achievements in the aerospace industry have attracted national attention. I am far from being counted. I am just busy. .”
"If you are busying around, then most people are probably just dawdling around and have no skills."
"Okay, let me show you around first. I asked you to come here this time. In fact, I also have something good to tell you.”
Yang Anchao took the initiative to walk in front and took Wang Donglai to visit.
Actually, there is not much to visit at the Beijing Space Administration. If you really want to visit, it would be best to go to the launch center.
So, Wang Donglai and Yang Anchao quickly arrived at his office.
"Professor Wang, the last Chang'e-5 tester flight mission was successfully completed. Your development of lidar played a big role."
"It's just because it is a confidential project. , there are some things that cannot be disclosed at all, so your contribution is not disclosed.”
"But you don't have to worry, the organization will not forget your contribution, and you will get the honor you deserve."
As he said that, Yang Anchao took out a document from the cabinet in his office , handed it to Wang Donglai.
"No, this is the commendation document for you. Once the technology is fully understood, it should be announced by the end of the year at the latest."
"You also know that various countries attach great importance to aerospace. , the technology in this area is also kept extremely strictly confidential, and will not be made public until other countries catch up."
"This is just a commendation document. Are you a little curious about why there is only one. Verbal praise, but no real reward? ”
"Don't shy away from this. This is not a good thing about our country. We should be rewarded for our merit. As technicians, we cannot think that this mentality is shameful."
"Zigong Shu You must also know the story of Niu. Some propaganda on the Internet goes too far, always saying that it has done harm to the country. Scientists who have made great contributions do not receive corresponding treatment, and scientific researchers are treated harshly. This is all nonsense."
"The outstanding youth project funding you applied for actually rewards you for this lidar. The reason."
As Yang Anchao finished speaking, Wang Donglai understood it completely this time.
Looking back, Director Kang Chao of the National Natural Science Foundation of China showed his kindness to him, which was a bit strange.
Now when combined with what Yang Anchao said, it becomes immediately clear.
"Academician Yang, it's hard for you to hide this from me. I have always been confused about research funding, but I didn't expect this to be the reason."
"However, this reward is Isn’t it too heavy?”
“Is fifty million in research funds too much?”
Wang Donglai asked curiously.
When Yang Anchao heard Wang Donglai's question, he burst out laughing and said, "Okay, don't worry, I don't know if you are confident or if you are a young man who doesn't know how high the sky is."
" Domesticization of the semiconductor industry is such a big project topic. Dare to report it.”
“To be honest, if your performance in the past two years had not been really excellent, I am afraid that the project you applied for would have been passed. Even so, it was relatively reluctant. Passed.”
Wang Donglai had a smile on his face. , explained in a serious tone: "Semiconductors are too important to modern technology, and our technological accumulation and development in this area are far behind the international advanced level. This is a huge hidden danger. Once foreign sanctions block us, we will be It will greatly hinder our technological development."
“The localization of semiconductors is beneficial and harmless to the country. As for its difficulty, we cannot not overcome it just because it is too difficult. At that time, our country’s aerospace technology was far inferior to that of foreign countries. Until now, Why not catch up and become a powerful country?”
Yang Anchao's eyes flashed with joy, and he said rather amusingly: "I guessed that you would say that, so the 50 million research funds are not only due to your contribution, but also because you chose the topic of semiconductor localization. It’s just the combination of reasons.”
“Everything you can think of will naturally come to mind, but what I didn’t expect is that you, a young man, would step up and take the lead. Already."
"Okay, this matter is over. Don't think too much, don't feel any pressure, just calm down, just do it normally and study it."
"As long as your research makes progress, the organization will increase its support for you, and there will be no shortage of research funds and corresponding support."
Hearing what Yang Anchao said, Wang Donglai nodded and expressed that he Know.
At this moment, Yang Anchao suddenly sighed.
“Well, I originally thought you were interested in aerospace, so I took this opportunity to invite you to join the aerospace industry, but I didn’t expect you to apply for a semiconductor project. I heard that you were also working with Yao Qizhi on artificial intelligence at Wudaokou. There will probably be no time for the big intelligent model now.”
The words were full of regrets, obviously regretting that Wang Donglai could not join the aerospace team.
Wang Donglai's eyes moved, and he smiled at Yang Anchao and said: "Academician Yang, in fact, I am very interested in aerospace. I even want to be an astronaut and fly to space to see. If I can still board The month will be even better.”
“Academician Yao is presiding over the large-scale artificial intelligence model. I also have a clue about the localization of semiconductors. I can still squeeze out time. Academician Yang might as well give me a chance.”< br>
Hearing what Wang Donglai said, Yang Anchao's face suddenly showed obvious joy, and his expression fell into thinking.
To be honest, Yang Anchao admired Wang Donglai's research ability.
And Wang Donglai also proved his research ability.
At the same time, mathematics is an extremely important part of aerospace work.
It would definitely be a good thing if a mathematical genius like Wang Donglai could join us.
Thinking this way, Yang Anchao was already inclined to agree.
However, Yang Anchao looked serious and decisively rejected the idea proposed by Wang Donglai.
“If you want to be an astronaut, it’s probably impossible!” (End of Chapter)