Before revision: The demand for metals by modern technology has been shifting from common base metals to a variety of minor metals, such as cobalt or indium. The industrial importance and limited geological availability of some minor metals have led to them being considered more "critical, " and there is a growing investment interest in such critical metals and their producing companies .
After revision: Stock trend prediction is a challenging task due to the market's noise, and machine learning techniques have recently been successful in coping with this challenge .