Chapter 373

It took more than ten minutes for Cheng Nuo to read the document sent by Professor Fresnel.

Mixing's requirements are simple, at least Cheng Nuo seems like this.

They only need a set of procedures that can design a set of corporate finances and stock income, as well as individual stock investment, according to the specific situation of their company.

This is the most basic data program for all financial securities companies.

There is a lot of information about this on the Internet, and Cheng Nuo has browsed it in general.

He pressed his chin against him, frowned and thought for a moment, and immediately had an idea.

Regarding the algorithm used to run this program, Cheng Nuo has already made his own decision.

GA-RS-LR algorithm!

Translated into Chinese, it is the genetic algorithm-rough set-logistic regression method.

This is a kind of blind deletion attribute reduction algorithm and heuristic algorithm, which was pioneered by Polish mathematicians in 1982.

This mathematical tool works wonders when dealing with ambiguous and uncertain information.

This algorithm is no better for dealing with the ambiguous data relationship between the company's finances and stock earnings in this project.

The time was tight, only seven days.

Now that the core algorithm has been determined, the following is the plan for making a program modeling.

Cheng Nuo thought for a while, and clarified the idea of the project in his mind: use the GA-RS method to obtain the optimal reduction of financial indicators, and then use the LR model to explore the relationship between the two. Finally, the impact of financial indicators on stock investment is obtained through the reduction of GA-RS.

By this point, the main part of the project should have been completed.

The corners of Cheng Nuo's mouth curled, he created a new document, put his fingers on the keyboard, and began to work.

For a modeling project of this difficulty, Cheng Nuo is not qualified to use scratch paper, just calculate it directly in his mind.

Cheng Nuo crackled on the keyboard, and his thoughts were as smooth as gurgling water.

Genetic algorithms can be globally optimized and implicitly parallel, but there are still specific factors to consider.

First and foremost is the issue of chromosomal encoding.

Let the set of conditional attributes be C={c1,c2,c3...... cn}, the conditional attribute space Ωc can be mapped to genetic algorithm chromosomes, and each chromosome is represented by an n-dimensional (0,1) binary bit string, so that the chromosome individual and the attribute subset establish a one-to-one correspondence relationship.

This is followed by the construction of the adaptive value function, which can be combined with the principle of satisfying the simplicity of the properties with the relative dependence:

F(x)=f(x)γcd(x)=(1-card(x)/n)*card(POS(D))/card(U).

The remaining factors include selection probability, crossover and variation, algorithm termination conditions, etc.

Before Cheng Nuo could do this part of the work, he was handed over to lunch by Hull, along with Henry and Gal.

Along the way, Cheng Nuo and Hull walked in front and chatted, and Henry and Gal kept staring at Cheng Nuo's back in the back, as if they wanted to see something from Cheng Nuo's back.

It's a pity that they didn't see anything.

Staying in the Massachusetts Institute of Technology, they also often see Chinese people.

But in the eyes of the two, Cheng Nuo is no different except that he is more handsome and younger than those people!

So what was the reason for him to take on a project that the three of them couldn't do in a week?

The two of them didn't understand this question after thinking about it all morning.

Cheng Nuo and Hull walked into the place where lunch was settled with a smile and a smile...... School cafeterias.

That's right, it's the school cafeteria.

The Fresnel Research Office is home to a lab not far from the MIT cafeteria.

Moreover, as the school canteen of the world's top universities, its meals are not much more than some high-end restaurants.

It's just that Cheng Nuo hasn't adapted to the taste of the United States yet.

After a tasteless lunch, Cheng Nuo returned to the office in good spirits, gave up his lunch break, and continued his work.

Hull was surprised by Cheng Nuo's workaholic's energy.

As everyone knows, during those days in China, Cheng Nuo was even busier than now. That's really a life to explode the liver!

It took an afternoon for Cheng Nuo to get the specific content and formula of the three factors of selection probability, intersection and variation, and algorithm termination condition without much effort.

Stretching, Cheng Nuo glanced out the window and found that the sky outside was dark.

In the next second, the torrential rain poured down.

Cheng Nuo frowned and looked at the branches swaying in the wind outside the window, and said, "It's raining!"

Immediately afterwards, Cheng Nuo felt a pain, because he didn't look at today's weather forecast, so he didn't bring an umbrella when he came over.

There was no way, Cheng Nuo could only type on the code of the mathematical model while waiting for the rain outside to stop.

The number of people in the office has decreased one by one, but the heavy rain outside has not stopped in the slightest.

"Cheng, you didn't bring an umbrella, or the two of us use one, there is a supermarket next to the laboratory building, which should be sold. Hull walked over and asked.

"Well, thank you. Cheng Nuo smiled.

At this moment, there was a series of soft knocks on the door.

Then a familiar voice sounded, "Hello, Cheng Nuo is here, I'm his friend, and I've sent him an umbrella." ”

The door was pushed open, revealing He Youjun's voice outside.

At this time, he was holding two black umbrellas, panting slightly, and looked at Cheng Nuo in the office with a smile.

............

In the evening, He Youjun took Cheng Nuo to wave around in Cambridge on the grounds of letting Cheng Nuo adapt to the environment of the United States as soon as possible.

He Youjun also wanted to take Cheng Nuo to experience the rice version of "great health care", but Cheng Nuo sternly refused.

So, He Youjun rushed back to their temporary "home" in the United States with Cheng Nuo, who was a little regretful.

"Here, take this. After washing, He Youjun, who was sitting on the sofa watching TV, handed Cheng Nuo an invitation letter.

"What is this?" Cheng Nuo wondered.

"The invitation to that party this weekend, I mentioned to you earlier. He Youjun said lightly.

"Oh, this thing. Cheng Nuo was stunned.

Cheng Nuo thought about it for a while, and the time point on the weekend happened to conflict with the time when he was researching the project.

But in one night, it should still be able to squeeze out. They are all a group of foreigners studying abroad, just like meeting "fellow countrymen" in other places, there is no harm in getting to know them.

After chatting with He Youjun for a few words and determining some specific matters about the party, including time and place, Cheng Nuo returned to the bedroom, took out the computer, and continued to work.

On the table at the head of the bed, there was a bottle of kidney treasure that he had brought from Huaguo.

This thing is not sold in the United States. If you want to drink it in the future, you still need to mail it from Huaguo.

Or, apply for it yourself and see if there is a chance to become an agent of Kidney Bao Company on this side of the country.

Let the drink of "Kidney Treasure" enter the homes of thousands of people in the United States.

Let the children who are addicted to cultivating immortals touch the realm of the broken void in advance and successfully go west.

..................

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