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The Internet of Things (IoT) has become widespread around the world. Since a large number of diverse devices such as vehicles, household electrical appliances, smart phones, and environmental sensors are connected to the Internet, we can obtain a large volume of diverse IoT data, known as IoT big data. The generation of IoT big data means that efficient analytic systems are needed for many application scenarios, for example, to optimize urban planning, solve air pollution problems, and improvedoi:10.1109/jiot.2021.3131724 fatcat:cgvglkxiavdg3a6uv2zljl4ofm