Riding the wind of rebirth

"Giving a neural network an input vector and having it output the corresponding output value based on its own parameter matrix is ​​called forward propagation. This is how it can be described in mathematical language."

"Let the activation value of the i-th neuron in the L-th layer be a(l)i, and the parameter be the row vector (·)(l)i. If there are s neurons in this layer, then the dimension of the row vector in this layer is sl+1..."

"Where does this extra 1 come from?" Zhou Zhi started asking questions again.

"Because we need to set the bias unit. So the row vector of this layer will be a huge matrix, its rows are S(l+1) and its columns are Sl+1."

"This is just one layer," Zhou Zhi understood a little: "You said before that this method of connecting neurons in every two adjacent layers is called full connection. In fact, the final result is the final result after the input layer penetrates all hidden layers through the nonlinear activation function. In other words, it is the result after countless matrix superposition operations, right?"

“That’s roughly how it can be understood,” said Mai Xiaomiao. “However, it should be noted that the weights and biases in the neural network are learned by the machine itself and are called model parameters. The number of layers in the neural network and the number of nodes in each hidden layer are all pre-specified parameters. These pre-specified parameters that do not change during the learning process are called hyperparameters.”

"This is just the case of a single output. If we want to solve the problem of multi-classification output, the operation structure will become more complicated, and it will become another matrix superposition of the above model matrix."

Mai Xiaomiao was a little excited and pulled Zhou Zhi's sleeve: "Before returning to China, I was always worried that no one would understand the superiority of this mathematical theory, and was frightened by the resources and investment it would require. If we look at the funding plan of the ministry... Elbow, thank you very much."

"If we follow that funding plan, I'm afraid there will be another inspirational story of rubbing an atomic bomb by hand." Zhou Zhi said, "In fact, Director Song and the others understand, but... you have visited many children's homes now, so you should understand that there are too many places where the country needs money."

This is the current situation of the country. It is too sad to talk about it. Even for such an important national equipment as the Beidou Navigation Experimental Satellite System Project, the initial theoretical verification phase received two grants totaling only 650,000 yuan.

"Well, don't worry, Elbow. I am very confident in the calculation model I brought. It has been verified in theory."

"You were able to convince the ministry and the Academy of Sciences to agree to build a laboratory, which is a sign of their confidence in you." Zhou Zhi smiled and said, "You don't have to worry about my opinion. Although I don't understand your advanced mathematical knowledge, I have confidence in you. Xiao Miao, go for it!"

"Yeah!" Mai Xiaomiao nodded: "But... I have a question."

"what is the problem?"

"If you keep asking questions like this, it will easily turn into a casual chat and eventually affect my work progress."

"Is that so..." Zhou Zhi said faintly: "In fact, I am you yesterday..."

“Ah? Hahaha…”

"Then let's make a rule," Zhou Zhi said, "When we are doing our own work, we will not interfere with each other unless it is necessary to communicate."

"Okay, otherwise it would be embarrassing to waste your investment." Mai Xiaomiao said with a smile.

The following days returned to normal. When Mai Xiaomiao came here, she felt that she became healthy and fulfilled. She got up at six in the morning and followed Zhou Zhi to clear the to-do items left in the system last night; then she exercised, sometimes climbing, sometimes jogging, and sometimes practicing boxing; after that she had breakfast and went to class. In the afternoon she arranged home visits, or visited various places such as scientific research bases, green power construction sites, chicken farms, and pig farms; or she followed Lao Chi Ri to collect intangible cultural heritage; after coming back for dinner, she began to clear the to-do items left over from the day before entering into personal study and research. They were in the same room but did their own things and did not interfere with each other unless necessary.

However, necessary rest and relaxation are also necessary in the intervals between intense study and work.

Zhou Zhi couldn't help but feel a little distressed when he thought of a spoiled girl like Mai Xiaomiao coming to Lianhe Township where conditions were tough. But there was nothing he could do about it, so he could only make up for it by eating delicious food.

For example, barbecue is a very important midnight snack.

The moon in Liangshan Prefecture is unique and the starry sky is extremely beautiful, so Zhou Zhi and Mai Xiaomiao, sometimes joined by Wu Renzhong, Li Lu, Liang Guangping and Liu Hongtao, and Hao Chunwang would occasionally join in. They would set up small tables and chairs in the square in the middle of the grain station, put on the barbecue grill, and barbecue while admiring the moon, drinking and chatting.

When young people get together, they can talk about endless topics, and friendships grow quietly in such an atmosphere.

By the weekend, two more young people joined the team - Jike Azi and Shama Ricong.

When the two arrived, Zhou Zhi was busy making fried meat with Gillette Abi.

The production method is not complicated. First, refine the lard from the big black pig.

Then rinse the marinated pork with clean water to remove all the attachments on the surface of the meat, drain the water and set aside;

Put the marinated pork into the lard pan and fry it over high heat. When the surface of the pork turns yellow, switch to low heat and fry it slowly until the surface of the pork turns golden and has a strong fried meat aroma, then stop heating.

Pour strong liquor into the prepared clay pot, light it to sterilize, put the fried meat into the pot, and pour lard into the pot to cover the meat, then cover it. Finally, store the sealed jar in a shady place for a winter, after which you can give it to relatives and friends, and store it at room temperature in a sanitary, dry, cool, and ventilated warehouse with a partition off the ground.

6◇9◇Book◇Bar

This is a unique delicacy due to the Liangshan region's climate, which is dry in winter and spring but not severe cold, and rainy in summer and autumn but not extremely hot. Even if stored for more than a year, it will not deteriorate. It is moderately salty, crispy on the outside and tender on the inside, fat but not greasy, fragrant and glutinous, and delicious.

However, it is impossible to eat bacon on the same day it is smoked like Jiachuan bacon. The flavor of the oily meat needs to be stored in the jar for at least one month before it changes.

Therefore, in order to satisfy the eagerness of Mai Xiaomiao, the little glutton, Zhou Zhi had to make another delicacy from Jiachuan - Zhuerba.

Zhuerba is made by kneading rice and a small amount of glutinous rice into flour, wrapping it with stuffing and steaming it in a steamer.

If you use only glutinous rice, it will become soft and shapeless when steamed. Then it can only be boiled in a pot. It can no longer be called pig cake, but only meat glutinous rice balls.

When arriving in Liangshan, it was necessary to adapt to local conditions, so Zhou Zhi changed the pig cake into buckwheat cake with stuffing. There happened to be an oil pan, so he simply made it into the shape of a large olive kernel with two pointed ends and fried it in the pan.

The filling is made of dried vegetables, dried mushrooms, dried tofu, oil residue, minced meat, green onions, and minced ginger soaked in water. It is fried in a frying pan until golden brown and the buckwheat shell becomes crispy. Then Mai Xiaomiao, who has been waiting on the side, picks it open with chopsticks, and a rich aroma that satisfies people with carbohydrates, fats, and protein wafts out.

"It smells so good!" Mai Xiaomiao was already drooling over it.

"What a nice smell!" Jike Azi and Shama Ricong, who had just entered the grain station, also sniffed: "What delicious food is this?!" (End of this chapter)