Correlation between the halo concentration parameter c_NFW and t_1/2 across different RF and CNN models. The first and second rows show the correlation trends for the six RF models discussed in Section 3, while the third row corresponds to the three CNN models described in Section 4. In each panel, the shaded red region represents the 16th-84th percentile range of the ML predictions, and the shaded gray region shows the same range for the actual simulation values. The solid red and dotted black lines indicate the median t_1/2 in logarithmic bins for the ML models and the simulation, respectively. Pearson correlation coefficients are annotated to quantify the strength of the relationship between c_NFW and the predicted formation times.