估测Google搜索算法的提高 ， 原文标题：Measure the improvement of Google search algorithm。Google在成立15周年生日的当天，发布了新的搜索引擎算法，提高了搜索的准确度和效率。下面讲的是Google是怎么做的。他们先在一个沙盒里做试验，然后提交给测试者，然后在放入少量的真实用户来试用。通过这样子的方式来迭代改进他们的算法。
On the day of Google's 15th birthday, Google released its new "Hummingbird"（蜂鸟） search algorithm（算法）, this is the first time that Google changes its search algorithm since 2010 after the Caffeine（咖啡因） algorithm. It will affect（影响） 90% of search results, according to Amit Singhal, Lead of Google Search.
Some may be curious（好奇） about how Google measures the improvement of a new search algorithm. There are many factors（因素） need to be considered（经过深思熟虑的）, for example, accuracy（精确度）, relevance（关联）, search depth etc. According to Amit Singhal, they have the entire（全部） web in a sandbox that only their engineers can see, and their engineers can take their new algorithm and see it change millions（数百万） of queries. Engineers typically（代表性的） start by running a series（系列） of experiments（尝试，实验）, tweaking（对。。。稍做调整） small variables and getting feedback from colleagues（同事，同行） until they are satisfied（感到满意的）. Then they send it to testers, whom they pay, but they don’t tell them what they are testing.In this phase（阶段）, the search precision（精准度） is evaluated（评估）, each one of the tester will get a Search Quality Rating Guideline, this guideline will tell testers how to measure precision.
If the evaluators’ feedback looks good, they move forward with a “live traffic（交通，通信量） experiment.” In these experiments, they will change search for a small percentage(one percent) of real Google users and see how it changes the way they interact（相互影响） with the results. Later they carefully analyze the results to understand whether the change is an improvement to the search results. For example, do searchers click the new first result more often? If so, that’s generally a good sign.
Finally, Google's most experienced（老练的，富有经验的） search engineers carefully review the data from all the different experiments and decide（决定，解决） if the change is approved（被认可的，经过检验的） to launch or needs to be refined and retested.
For details about measurement of search engine algorithms, you can refer（参考） a more technical version : Evaluating（评估） Search Engines
英文原文网址 ： http://www.pixelstech.net/article/1380515090-Measure-the-improvement-of-Google-search-algorithm
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