Nonparametric reconstructions of the late-time expansion history using ANN. The top panels show results obtained from the DESI BAO data alone, while the bottom panels combine DESI BAO with DESY5. From left to right, the panels display the evolution of the dark energy equation of state w(z), the Om(z) diagnostic, and the f_DE(z). Shaded regions indicate 68% confidence intervals; the joint analysis (bottom row) yields visibly tighter constraints.