Spark provides a simple and expressive programming model that supports a wide range of applications, including ETL, machine learning, stream processing, and graph computation.
它提供一套简单并富有表现力的编程模型，支持一系列应用，包括ETL（Extract，Transform and Load），机器学习，流处理，以及图谱计算。
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A geometrical expressive method of the machine-readable data concerning number axis is introduced, and with this method, the question of overflow related to complement arithmetic is analyzed.