compute_ode_residuals   Physics Residuals at Collocation Points
default_ode_system      Default Physical ODE System (Degradation
                        Process)
fit_pinn_progcens_mle   Maximum Likelihood Estimation via PINN
                        Optimization
interpolate_state       Interpolate Trajectory State
pinn_hazard             Physics-Regularized Hazard Rate Mapping
pinn_progcens_loss      Combined Structural Loss (Censored Likelihood +
                        Physics Residual)
softplus                Softplus Activation Function
solve_ode_trajectory    Forward State Trajectory Integration
