TY CONF TI USING MACHINE LEARNING TO ANALYZE THE EMOTIONAL TONE OF RUSSIAN-LANGUAGE PRODUCT REVIEWS KW data analysis KW text processing KW machine learning KW machine learning methods JO CHALLENGING ISSUES IN SYSTEMS MODELING AND PROCESSES AU Oksyuta, O.V. AU Yudin, A.V. PY 2025 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov