Rebirth 2002: Nano Life

September 18.

This is a day to never forget national shame.

On this day, Baidu announced major news.

Netease News:

"Yesterday, Chinese search engine Baidu announced that Xu Yong, one of the company's two founders, will be on the 26th of this month.

Xu Yong submitted his resignation letter in May, and neither Xu Yong nor Baidu explained the reason for his resignation. Baidu insiders revealed that there is no one to replace Xu's position for the time being, and the business Xu is currently in charge of will be divided into various related departments.

Xu Yong used to be Baidu's top executive after Robin Li. In 1999, Xu Yong and his alumnus and friend Robin Li founded Baidu and held the position of vice president; earlier this year, Xu's position changed from vice president to chief strategy officer, responsible for the company's strategic direction. Xu Yong said that after his resignation, he will develop in his "old line" in the field of biology. "

After Baidu acquired the search engine, it once again consolidated its position as the dominant Chinese search engine. The HC network, which had been in full swing in the previous year, has now been defeated by Baidu.

Prior to this, Baidu's engineers were very smart in various indicators of the quality of Chinese search results, and they did a fine job in some points. Although they still have advantages compared to Google, they still have an advantage in search-related. In terms of basic technology, Baidu still lags behind.

Baidu's search quality has improved, and a large part of it relies on manual efforts to make a lot of meticulous strategic adjustments. After Baidu acquired Souxia, it has made great breakthroughs in the basic technology related to search. Its technological innovation ability has been repeatedly mentioned by the media this year, but its business model is still criticized by it. where.

Co-founder Xu Yong resigned and Li Yanhong strengthened the company's control. This is basically everyone's first thought when they saw the news. At the beginning of the year, Xu Yong was appointed as the CSO. Anyone who understands can see at a glance that this is actually a somewhat false position.

The relevant speculation in the media is: Xu Yong's departure is a part of Baidu's personnel adjustment for the listing, and it is to "make way" for Baidu's listing and financing.

This statement makes sense. In June, Baidu had already conducted its third financing, which was the last financing before going public. This time it was a strategic financing. It introduced eight venture capitals including googli and DFJ. The institution invested a total of 15 million US dollars, with 2.25 million shares, equivalent to 7.98% of the shares, while Xia Meng's shareholding was reduced to 11%. It is expected that after the public offering, Xia Meng's shareholding will become 9%.

Throughout the Chinese Internet companies listed on Nasdaq, all of them have staged a big earthquake of high-level personnel adjustment before listing, and Baidu is no exception.

Just why did Xu Yong get out of the game in Baidu's personnel adjustment earthquake? The secret is that no one knows the real answer except for Baidu's high-level estimates.

Don't care why Xu Yong is out, anyway, this news is good news for Chen Yizhe.

As soon as he heard the news, Chen Yizhe called Xu Yong, "Brother Xu, Mr. Xu, you are all light now. You should have time to come over to Pengcheng for a stroll, right?"

"I'm afraid that when I get to your side, I will become heavier again!" Xu Yong laughed.

"Brother Xu, are you afraid that I will put gold on you?" Chen Yizhe joked.

"Really? Then I have to bring a sack along the way this time!" Xu Yong laughed.

"As long as you come, you can come here in a big truck!" Chen Yizhe said.

At the end of September, Xu Yong really came to Pengcheng.

Chen Yizhe took Xu Yong to visit the current situation of the cdss project.

For more than a year, Xu Yong has sent a large amount of hospital clinical data one after another, and the cdss project team of up to 30 technicians has been working on standardizing the data.

At present, Xia Meng has initially developed cdss to support appendicitis, liver tuberculosis, gastric tuberculosis and other special diseases under the design of Chen Yizhe.

"No wonder the technology of the search engine makes Baidu's technical team amazing. It seems that Xiameng Internet is full of talents." Xu Yong sighed.

"Hehe, Baidu's technology is not bad. You can see that Google is blocked by Baidu, and now Google can only curve into China." Chen Yizhe smiled.

Xu Yong shook his head and said, "To be honest, there is still a certain gap between Baidu and Google. It's just that in the domestic market, Baidu occupies the right time and place. This is actually a concentrated expression of 'Baidu understands Chinese better'. Speaking of word segmentation, Baidu did word segmentation in the past, starting with a dictionary of manual editing numbers, using this dictionary to run some web pages, and observe the bad cases inside.”

"It may be that the word segmentation is too fine, or the Chinese names are not separated, and then try to solve these badcases by adding rules or adding vocabulary according to the rules of Chinese grammar, and so on, until a satisfactory result is obtained. Launch the application and find new badcases. Research plus rules, and of course there are automatic processes to discover and confirm new words such as "people are tough!"

"Brother Xu, I can't believe that you, who came from a medical background, can understand the technology!" Chen Yizhe laughed.

"I've been working in this industry for five years, I've never eaten pork, and I've seen pigs run." Xu Yong laughed at himself, and then he continued, "The biggest difference between Google and Baidu is that Google puts more emphasis on technology, and it does Word segmentation treats the problem as a probability problem: if words appear together frequently in Chinese web pages, then they are likely to be one word. Look at which words will be followed by land, and what words are often followed by land. The grammatical structure comes out.”

"The idea of ​​solving the problem is to throw all the captured Chinese web pages into MapReduce and calculate the parameters. The method of evaluating the quality of word segmentation is also very simple. Just put the new model into the web page retrieval model and do an experiment to see. Whether the quality is improved or not. The results of this method are very good, basically turning Chinese word segmentation into a simple problem without much suspense!"

"Actually, this is also the problem that Google doesn't understand Chinese, because it does not require the participation of Chinese language experts! At the same time, this is the idea of ​​Google's real-time translation." Chen Yizhe continued, "However, although this method is simple, it does not seem to have any secrets. It can be said, but first of all, Google has to have so much web data, a large computer cluster, a distributed computing framework, and a reusable model... This is the same in cdss, cdss also needs big data, The calculation model seems simple, but it is actually extremely complicated!"

"This is inevitable. After all, medical knowledge is too complicated. Doing cdss projects often needs to consider a lot of patient factors, such as symptoms, signs, laboratory test data, family history, genes, epidemiological data, existing Medical literature, etc. At the same time, there are tens of thousands of newly published clinical studies, and the quality is uneven, and these large amounts of data lead to huge difficulties in the final maintenance of cdss even if it is developed.”

"Currently successful clinical decision support systems are often limited to a certain field and have limited coverage. For example, the Leeds abdominal pain diagnosis system, which was launched in 1971, has a diagnosis accuracy rate of over 90%, while that of doctors is 80%. %, but this system can only be used to diagnose abdominal pain. It can be seen that the research and development of the cdss project is far away!" Xu Yong couldn't help sighing.

"Brother Xu, most current clinical decision support systems ~www.wuxiaspot.com~ usually include three components: knowledge base, inference engine and human-computer communication interface. The knowledge base stores a large amount of compiled information, usually using IF -THEN rules for storage and management."

"For example, regarding the interaction of drugs, the rule can be written as "IF taking drug X, AND taking drug Y, THEN displays a warning message". Advanced users can also customize the knowledge base in another editing interface according to their own needs. Rules, such as real-time updates of new drugs, etc. The inference engine automatically integrates and analyzes patient data according to the rules in the knowledge base. The human-machine communication interface feeds back the analysis results to the user or as system input.”

Chen Yizhe glanced at Xu Yong and continued, "This kind of clinical decision support system using a knowledge base will indeed complicate clinical data and make it difficult to update and maintain it. However, I have already prepared to use artificial intelligence on the basis. !"

"Artificial intelligence?" Xu Yong said in surprise. Although artificial intelligence has been proposed for nearly 40 years and countries have invested a lot of money in research, there has been no major breakthrough. According to what he heard, Google has already entered this field in the first two years. field.

Chen Yizhe nodded, "Using machine learning to automatically grab rules from existing experience, let the cdss system not only become a data input, but also a data collector."

"What kind of construction method is Xia Meng's AI based on?" Xu Yong asked curiously.

"It's mainly based on the combination of artificial neural network and genetic algorithm!" Chen Yizhe replied, in fact, to be precise, if the cdss is finally determined to be launched on the market, its AI terminal must be clear. Only in this way can the data be disclosed in a timely manner. Absorbed, and the diagnosis is not easy to have idiot problems!