"Provide the input vector to the neural network and let it output the corresponding output value according to its own parameter matrix. We call it forward propagation. This is how it is described in mathematical language."
"Remember the Lth layer The activation value of the i-th neuron is a(l )i, if the parameters are recorded as row vectors (·) (l)i, if there are s neurons in this layer, then the dimension of the row vector in this layer will be sl+1 dimension..."
"Where did this extra 1 come from?" Zhou Zhi started asking questions again.
“Because we need to set up the bias unit. So the row vector of this layer will be a huge matrix, its rows are S(l+1) and the columns are Sl+1.”
“This is just one of the layers,” Zhou Zhi understood a little bit: “You said before, this kind of The way in which the neurons in two adjacent layers are all connected to each other is called full connection. In fact, the final result is the final result after the input layer penetrates all the hidden layers through the nonlinear activation function. In other words, it is after countless processes. The result of a matrix superposition operation, right? ”
"It can be understood like this." Mai Xiaomiao said: "But it should be noted that the weights and biases in the neural network are learned by the machine itself. They are called model parameters; and the neural network has several layers in total, each How many nodes are there in the hidden layer, etc. These parameters are pre-specified. This parameter that is pre-specified and does not change during the learning process is called Hyperparameters. "
"This is only the case of single output. If we want to solve the problem of multivariate classification output, the operation structure will become more complicated and 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 could understand this kind of data. The superiority of academic theory is only frightened by the resources and investment it requires. If we look at the funding plan of the ministry... Thank you very much.”
“ If we look at that funding plan, there will probably be another inspirational story about rubbing the atomic bomb." Zhou Zhi said: "Actually, it's not that Director Song and the others don't understand, it's just that they don't understand. But...you have visited many children's homes now, and you should understand that there are too many places where the country needs money."
This is the current situation of this country, and it would make me cry if I talk about it too much. , even for such an important national weapon as the Beidou Navigation Experimental Satellite System Project, in the early theoretical verification stage, a total of two allocations were given, totaling only 650,000.
"Well, don't worry, I'm very confident in the computational model I brought, and it has been verified in theory."
"You can convince the ministries and the Academy of Sciences to agree to establish the laboratory, This is a sign of everyone's confidence in you." Zhou Zhi smiled and said, "You don't have to worry about my opinion, even though I don't understand your advanced mathematics. Knowledge, but I have confidence in you, Xiaomiao, go for it boldly!"
"Yeah!" Mai Xiaomiao nodded: "But... I have a problem."
" What's the problem? ”
“You keep asking questions, which can easily turn into chatting, and ultimately affect my work progress. ”
"That's it..." Zhou Zhi said quietly: "Actually, the me today is the you yesterday..."
"Huh? Hahaha..."
"Then let's set up a Rules." Zhou Zhi said: "When we are doing our own work, we should not interfere with each other unless necessary."
"Okay, it would be a shame to waste your investment," Mai Xiaomiao said with a smile.
The following days entered a normal state. When Mai Xiaomiao came here, she felt healthy and fulfilled. She got up at six in the morning and followed Zhou Zhi to first clear the to-do items left in the system last night; Exercise, sometimes climbing mountains, sometimes jogging, sometimes practicing boxing; then have breakfast, go to class, and get off work In the afternoon, we arrange home visits, or visit various places such as scientific research bases, green electricity construction sites, chicken farms, and pig farms; or we go out with Lao Chiri to collect intangible cultural heritage; we come back and have dinner, and start to clear the to-do items left in the day, and then Enter into individual study and research, being in the same room but doing their own things, and not interfering with each other unless necessary.
However, in the break between intense study and work, necessary rest and relaxation are also needed.
Thinking of a pampered little girl like Mai Xiaomiao coming to Lianhe Township, where conditions are difficult, Zhou Zhi couldn't help but feel a little distressed. There is nothing I can do about my heartache. The most I can do is find some food to make up for it.
Barbecue, for example, is an important late-night snack item.
The moon in Liangshan Prefecture is unique, and the starry sky is also absolutely beautiful, so Zhou Zhi and Mai Xiaomiao are sometimes joined by Wu Renzhong, Li Lu, Liang Guangping and Liu Hongtao, and occasionally Hao Chunwang. Come in, everyone sets up small tables and chairs in the square in the middle of the grain station, sets up the barbecue stove, barbecues, admires the moon, sips and chats.
When young people are together, they can endlessly chat about all kinds of nonsensical topics, and friendship quietly grows in such an atmosphere.
At the weekend, there were two more young people in the team-Jike Azi and Shama Ricong.
When the two arrived, Zhou Zhi was making oily meat with Gilliam Abi and was very busy.
The production method is not complicated. First, the lard from the big black pig is boiled out.
Then rinse the marinated pork with clean water to remove all attachments on the surface of the meat, drain the water and set aside;
Put the marinated pork into a lard pan and fry over high heat. After the surface of the pork turns yellow, fry slowly over low heat until the surface of the pork turns golden brown and has a rich aroma of fried meat products. Stop heating. .
Pour high-strength wine into the prepared clay pot, set it on fire to sterilize, put the fried meat pieces into the clay pot, and pour the lard into the clay pot to submerge the meat. block, add a lid; finally, store the sealed jar in a shaded place for a winter, and then you can give it to relatives and friends, and store it in a hygienic, dry, cool, and ventilated warehouse away from the ground and at room temperature.
This is a unique delicacy that benefits from the climate environment of Liangshan area, which is dry in winter and spring without severe cold, and rainy in summer and autumn without extreme heat. It will not deteriorate even if it is stored for more than a year, and it is moderately salty, crispy on the outside and tender on the inside. , fat but not greasy, fragrant and glutinous, delicious and delicious.
But it is impossible to smoke it and eat it on the same day like Jiachuan bacon. The flavor of the oily meat needs to be stored in the jar for at least a month before it can change.
So in order to satisfy the eagerness of Mai Xiaomiao, a greedy little cat, Zhou Zhi had no choice but to make another Jiachuan delicacy - pig cake.
Pig cake is made from rice and a small amount of glutinous rice flour, kneaded into a dough, stuffed with fillings and steamed in a basket.
If you use pure glutinous rice, it will be soft and shapeless when steamed. Then it can only be cooked in a pot, and it cannot be called pig cake, but can only be called meat glutinous rice balls.
When I arrived in Liangshan, I needed to adapt to local conditions, so Zhou Zhi changed the pig cake into a stuffed tartary buckwheat cake. If there was an oil pan, I simply made it into the shape of two pointed ends of a large olive stone and deep-fried it.
The filling is prepared from dried vegetables, dried mushrooms, dried tofu, oil residue, minced meat, chives, and minced ginger. It is fried in an oil pan until the tartary buckwheat shell becomes golden and crispy. Take it out, and the wheat seedlings that have been waiting aside use chopsticks to pick it apart, and a strong aroma that makes people smell the carbohydrates, fats, and proteins wafts out.
“It smells so good!” Mai Xiaomiao was already greedy.
"It smells so good!" Jike Azi and Shama Ricong, who had just entered the grain station, also sniffed: "What kind of delicious food is this?!" (End of Chapter)