PROBLEM TO BE SOLVED: To provide an operation amount determining device which is excellent in robustness to environmental changes and can perform additional learning for adapting to a new environment in a short time. An operation amount determining device for determining an operation amount related to a molding machine is an observation unit that acquires observation data obtained by observing a physical quantity related to the molding when molding by the molding machine is executed. An operation that generates a state expression map that expresses the state of the molding machine based on the observation data acquired by the unit, and an operation that outputs an operation amount based on the state expression map generated by the state expression unit. It is equipped with a quantity output unit. [Selection diagram] Fig. 5
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