WolframAlpha, a powerful newservice that can answer a broad range of queries, has become one of the most anticipated Web products of the year. But its creator, Stephen Wolfram, wants to make something clear: Despite the online chatter comparing it to Google, his service is not intended to dethrone the king of search engines.
2009年5月11日星期一
New Search Tool Aims at Answering Tough Queries, but Not at Taking on Google
有很多search方面的文章，下面的是新的
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Traditional search engines like Google and Yahoo, by and large, excel at finding information that already exists online. If there are Web pages that include the words used in a query, the engines will find them and rank them in order of relevance.
回复删除WolframAlpha is different. For starters, it does not gather data from the Web. Instead, its “knowledge base” is made up of reams and reams of data — ranging from the kinds of facts you would find in a World Almanac, to highly specialized data from physics and other sciences — that some 100 employees at Wolfram Research have gathered, verified and organized over several years.
When a user types in a query, WolframAlpha tries to determine the relevant area of knowledge and find the answers, often by performing calculations on its data. If you type “LDL 120,” it will return a graph showing the distribution of cholesterol levels among the United States population, and display the percentage of people above and below that figure. If you type “LDL 120 male 33,” it will adjust the results to focus on that gender and age group.
回复删除In response to “how far is the Moon from Earth,” WolframAlpha will calculate the exact distance based on an algorithm that computes the ever-changing distance between the two bodies. The engine that computes answers is largely built on Mathematica.
In its current state, there are many queries that WolframAlpha cannot answer, either because it does not understand the question or because it does not have the requisite data. For instance, it is stumped by queries like “obesity rate,” “housing prices New York” or “unemployment San Francisco” (but it will answer “unemployment San Francisco County”).
回复删除“It is going to be very good in some areas and incomplete in others,” said Nova Spivack, the chief executive of Radar Networks, which is using artificial intelligence and other techniques to help people find Web content that is interesting and relevant to them.
WolframAlpha does not actually try to work out the real meaning of a query, as some artificial intelligence systems do, so there are some questions it will never be able to answer. But experts say its approach appears to be effective in many areas.
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