Abstract: Decision-making systems powered by deep neural networks have transformed artificial intelligence applications across diverse domains. The choice of activation functions fundamentally influences network capacity to learn optimal decision policies, handle uncertainty, and generalize across contexts. This paper analyzes how activation functions impact decision-making processes in neural architectures, examining six fundamental functions: Linear, Sigmoid, Hyperbolic Tangent (TanH), Rectified Linear Unit (ReLU), Parametric ReLU (PReLU), and Exponential Linear Unit (ELU). Through mathematical analysis and empirical validation across decisionmaking benchmarks, we demonstrate that modern activation functions like ReLU and its variants provide superior performance by enabling better gradient flow, faster convergence, and more stable policy learning. Our findings reveal that activation function selection must balance computational efficiency, gradient preservation, and domain-specific requirements, with no single function being universally optimal. We provide quantitative metrics and practical guidelines for architecture design in decision-making systems.

Keywords: Activation Functions, Deep Neural Networks, Decision-Making Systems, Reinforcement Learning, Markov Decision Processes, Gradient Flow, Temporal Credit Assignment

Pages: 298-309