CAS-CODATA Training Workshop on Scientific Big Data and Machine Learning was held in Beijing on September 9-20. The training workshop received more than 750 applications and selected 25 talented scientists, data engineers and data managers representing 17 developing countries to participate in the training program on various topics such as basic data science skills, machine learning and data-driven scientific discovery, scientific data policies and good practices, and selected disciplinary scientific data stewardship exemplars. Detailed information can be consulted at the website of the training workshop: http://ccit2019.csp.escience.cn