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Accuracy and recall rate
Performance
Boolean search
Probabilistic IR and relevance
Queryparser
Query
Practice
Use xapian to build your own search engine: Search
After the previous introduction, if you refer to Omega again, it is estimated that you can successfully create a database and add a
and recall rate can be considered. Literally, it seems that there is still a spectrum of accuracy, but how can we explain the recall rate?Accuracy and recall rateSometimes, accuracy is also called accuracy. For example, a database contains 500 documents, 50 of which comply with the definition. The system has retrieved 75 documents, but only 45 of them comply with the definition.
Recall rate R = 45/50 = 90%
Precision P = 45/75 = 60%
In this example, the system
" (F1), "Chongqing Grilled Fish" (F2), "Chongqing Little Swan "(F3), ...], query frequency f1 > F2 > F3.
Solution Solutions
Keyword CollectionWhen the user enters a prefix, there are a lot of candidates for the prompt, how to choose, which shows in front, which shows in the back? This is a question of search heat. Users in the use of search engines to fi
Now listen to music there are a variety of ways, in cool dog, coolness big line, occupy the user desktop large portion of the same time. Some small public music, or need search engines to find audio-visual.
Now take the independent band-Thumb Girl and longjing, for example, experience the four major mainstream music search engine.
1. Baidu mp3:http://mp3.baidu.co
, and most users use multiple keywords for retrieval, website promotion results cannot be achieved only by ranking a few keywords. After the optimization design of the basic elements of the website, we can lay the foundation for the optimization of the search engine of the website. In the later website operation and promotion process, no matter which keyword we want to focus on, can be easily implemented wi
as possible, so when we talk about why an article is ranked higher than another, we should at least be able to show some evidence of what is happening. ”Grehan illustrates the process of search engine algorithms over time. In early search engines, text is extremely important. But search researcher Jon Kleinberg found
two types of search engine integration, but also generate other search services, here, we also call them search engines, there are two main categories:
⒈ meta search (meta search Engine
Elasticsearch is more suitable for emerging real-time search applications.Other Lucene-based open source search engine Solutions
Direct use of Lucene
Description: Lucene is a JAVA search class library that is not a complete solution in itself and requires additional development work.Pros: Proven solution
solution for traditional search applications, but Elasticsearch is more suitable for emerging real-time search applications.Other Lucene-based open source search engine solutions *
Direct use of Lucene
Description: Lucene is a JAVA search class library that is
traffic, the site weight of the promotion has significant value, has been explained before. Personally think that the above analysis of the flow structure for a normal site is very necessary, the site to be safe, to search engines have the clout to do this, the more you have the confidence, the more the search engine will respect you. The more you rely on the
call them search engines, there are two main categories:⒈ meta search (meta search Engine). Such search engines generally do not have their own network robots and databases, their search results are by invoking, controlling and o
We know that search engines have their own "search Robot" (ROBOTS), and through these ROBOTS on the web along the Web links (usually HTTP and src link) constantly crawl data to build their own database.For site managers and content providers, there are sometimes site content, do not want to be robots crawl and public. To solve this problem, the robots development community offers two options: one is robots.
combination of a variety of fascinating things creates rankings. We should get as much information as we can, so when we talk about why the ranking of an article is higher than another, we should at least be able to show some evidence of what is happening. ”
Grehan illustrates the process of search engine algorithms over time. In the early search
and upright from the search engine to obtain traffic, if you can do search engines do not give you the flow is the loss of the search engine, then you will not be afraid of keyword rankings do not go up, no fear of keyword ranking instability, No need to worry about the
refer to them as search engines, mainly including:
Meta Search Engine ). Such search engines generally do not have their own network robots and databases, their search results are displayed on the same interface in a unified format by calling, controlling, and optimizing t
Let's talk about how to use Python to implement a big data search engine.
Search is a common requirement in the big data field. Splunk and ELK are leaders in non-open source and open source fields respectively. This article uses a small number of Python code to implement a basic data search function, trying to let ever
different directories, is the site in the physical structure to maintain a clear hierarchy, such as a simple enterprise station: News Center, Product center, online services, etc. can be in the site and directory to set news, products, Services directory to store the section of the Channel page, column page, Terminal page these. At the same time in the Directory division is as far as possible not more than three times, this can shorten the URL address to the length, or use static URL or pseudo
as the normal station of the friend is not too much worry, of course, the 10,000 is afraid of the case, in case the site was accidentally injured by the strategy how to do? If this is the case, should we be prepared for it and prepare for it? That's how you tell your superiors or your boss that you're telling them the truth. Every year at the end of the Baidu algorithm will be a big upgrade, and Baidu itself is not perfect, it is inevitable to accidentally hit a group of websites, Baidu itself
, if the search automatically prompts can support pinyin will bring greater convenience to users, so as not to switch input method. For example, input "Haidi" prompt keyword and input "seabed" hint, the input "Wanda" and enter "Wanda" prompt keyword.
Support Polyphone input prompt such as input "Chongqing" or "zhongqing" can prompt out "Chongqing hotpot", "Chongqing Grilled Fish", "Chongqing Little Swan
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