Abstract
Big data refers to data sets that are so large that conventional database management and data analysis tools are insufficient to work with them [1]. Presently, we are in an era of big data, which exists in various fields, such as social media, telecom, finance, medicine, biinformatics, and power networks. Big data results mainly from the evolutionary development of data storage and data collection techniques in recent years. Big data has become a bigger-than-ever problem with the quick developments of data collection technologies. In fact, the word big is a fuzzy concept. So far, we do not have a mathematical definition of big data. But we can use several features or coordinates to describe it, for example, the well-known 5V characteristics.
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