Chapter 370

Chapter 373

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

The requirements of MI Xing company are very simple, at least Cheng Nuo looks like this.

They only need a set of procedures that can design a set of company financial 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 are a lot of information about this on the Internet. Cheng Nuo has a general look at it.

He leaned against his chin, frowned, and thought for a while, and was immediately inspired.

Cheng Nuo has made his own decision about the algorithm used to run the program.

Ga-rs-lr algorithm!

The language translated into Chinese is genetic algorithm rough set logic regression method.

This is a blind deletion attribute reduction algorithm and heuristic algorithm, which was first proposed by Polish mathematicians in 1982.

When dealing with vague and uncertain information, the mathematical tool has a certain effect.

For dealing with the fuzzy data relationship between corporate finance and stock returns in this project, this algorithm is no longer suitable.

Time is tight, only seven days.

Now that the core algorithm is determined, the following is the program modeling plan.

Cheng Nuo thought about the project for a while, clearing up the idea of the project: using ga-rs method to obtain the optimal reduction of financial indicators, and then using LR model to explore the relationship between the two. Finally, through the reduction of ga-rs, we get the impact of financial indicators on stock investment.

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

Cheng Nuo a corner of the mouth, a new document, fingers on the keyboard, began to work.

This kind of difficult modeling project is not qualified to let Cheng Nuo use the draft paper to calculate directly in his mind.

Cheng Nuo clattered on the keyboard, thinking as smooth as gurgling water.

Genetic algorithm can be global optimization and implicit parallel, but there are still specific factors to be considered.

The first problem is chromosome coding.

Let the set of conditional attributes be C = {C1, C2, C3 Then the conditional attribute space Ω C can be mapped to the chromosome of genetic algorithm. Each chromosome is represented by n-dimensional (0,1) binary bit string, which makes the chromosome individual and attribute subset establish a one-to-one correspondence relationship.

Then the fitness function is constructed, which can be combined with relative dependence to satisfy the principle of attribute reduction:

F (x) = f (x) γ CD (x) = (1-card (x) n) * card (POS (d)) card (U).

the remaining factors include selection probability, crossover and mutation, termination condition of algorithm, etc.

But Cheng Nuo has not yet done this part of the work, was handed out by hull to lunch, along with Henry and gal.

Along the way, Cheng Nuo and hull walked in front of each other and chatted. Henry and gal kept staring at Cheng Nuo's back, as if to see something from Cheng Nuo's back.

Unfortunately, they didn't see anything.

They often see Chinese people in MIT.

But in the eyes of two people, Cheng Nuo is more handsome and younger than those people. There is no difference between them!

Why did he take over a project that the three of them couldn't finish in a week?

Both of them have been thinking about this question all morning, but they haven't figured it out.

Talking and laughing, Cheng Nuo and hull walked into the lunch place School canteen.

Yes, it's the school canteen.

The laboratory where the Fresnel research office is located is not far from the MIT canteen.

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

However, Cheng Nuo has not adapted to the taste of the United States.

After a tasteless lunch, Cheng Nuo came back to the office, gave up his lunch break and went on with his work.

Hal was surprised by Cheng Nuo's workaholic spirit.

Little did he know that during his time in China, Cheng Nuo was busier than he is now. That's really using life to explode liver!

In the afternoon, Cheng Nuo did not spend much effort to solve the specific content and formula of three factors: selection probability, crossover and mutation, and termination condition of algorithm.

After stretching, Cheng Nuo glanced out of the window and found that the sky outside was dark.

The next second, torrential rain poured down.

Cheng Nuo frowned and looked out of the window at the branches shaking in the wind and said, "it's raining!"

Then Cheng Nuo's egg hurt, because he didn't see today's weather forecast, so he didn't bring an umbrella.

No way, Cheng Nuo can only knock the code of the mathematical model while waiting for the rain to stop outside.The number of people in the office decreased one by one, but the heavy rain outside did not stop.

"Cheng, you don't have an umbrella, or we can use one. There is a supermarket next to the experimental building. There should be some for sale." Hal came up and asked.

"Well, thank you." Cheng Nuo said with a smile.

At this time, a series of knock outside the door.

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

The door opened to reveal the voice of the king outside.

At this time, he is holding two black umbrellas, panting slightly, smiling at Cheng Nuo in the office.

…………

In the evening, he Youjun takes Cheng Nuo around Cambridge on the ground that Cheng Nuo can adapt to the American environment as soon as possible.

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

Therefore, he Youjun, carrying Cheng Nuo with slight regret, rushed back to their temporary "home" in the United States.

"Here, take this." After washing, he Youjun, who is watching TV on the sofa, hands Cheng Nuo an invitation.

What is this Chennault.

"I told you about the invitation to the party this weekend." He Youjun spoke lightly.

"Oh, this one." Cheng Nuo suddenly.

Cheng Nuo thought about it for a moment. The time point on the weekend coincided with the time when he studied the project.

However, one night time, should still be able to squeeze out. They are all a group of foreigners studying abroad. It's just like meeting "fellow villagers" in other places. It's no harm to get to know them.

After chatting with he Youjun for a few words and confirming some specific matters about the party, including the time and place, Cheng Nuo went back to his bedroom, took out his computer and continued to work.

On the table at the head of the bed was a bottle of kidney treasure he had brought from China.

It's not available in America. If you want to drink in the future, you need to send it from China.

Or, apply by yourself to see if you have the opportunity to become the agent of Shenbao company in the United States.

Let the "Shenbao" drink enter the homes of millions of people with liver blast in the United States.

Let the children who are addicted to the cultivation of immortals touch the realm of broken void ahead of time and successfully go west.

………………

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