 1. Parametrized quantum circuits are a promising hybrid classical quantum approach. 2. However, there are very few rigorous results available on their effective capabilities. 3. In this study, the authors investigate the feasibility of training depending on the type of cost functions. 4. They found that local cost functions are less likely to encounter the Baron Plateau problem. This article was authored by M. Serizo, Akira Sohn, Tyler Vokov, and others.