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Big data fields ml and pa are abbreviations of which two groups of English words?
Ml in the field of big data is machine learning (ML), pa generally refers to pa system, and pa stands for power automation.

ML: Machine learning is an interdisciplinary subject that has emerged in recent 20 years, involving probability theory, statistics, approximation theory, convex analysis, algorithm complexity theory and many other disciplines. Machine learning theory is mainly to design and analyze some algorithms that make computers "learn" automatically. Machine learning algorithm is an algorithm that automatically analyzes and obtains rules from data and uses the rules to predict unknown data. Because learning algorithms involve a large number of statistical theories, machine learning is closely related to statistical inference, which is also called statistical learning theory. In algorithm design, machine learning theory focuses on realizable and effective learning algorithms. Many reasoning problems are difficult to follow, so part of machine learning research is to develop approximate algorithms that are easy to handle.

Machine learning has been widely used, such as data mining, computer vision, natural language processing, biometric identification, search engine, medical diagnosis, credit card fraud detection, securities market analysis, DNA sequencing, voice and handwriting recognition, strategic games and robot applications.

PA: PA system is an open CNC system based on PC technology. Open CNC technology represents the most advanced technology in the global CNC field, and its advanced technology has been adopted by many famous automation companies in the world.

Shenzhen Otsu CNC Software Technology Co., Ltd. (hereinafter referred to as Otsu Software) is jointly funded by Shenzhen Otsu Laser Technology Co., Ltd. and Germany Power Automation GmbH (hereinafter referred to as PA), specializing in the research and development, production, sales and service of machine tool CNC system (PA system).