Left: comparing the predicted M/L to the true M/L for a gradient boosting machine without morphology (top) and with morphology (bottom). Both predictors only make use of the g-band. The colour of the points is a 2D gaussian kernel density estimate. Right: histogram of dex error (top) and ℒ₁ (bottom) for each galaxy. Purple is used for the predictor without morphology, while green is used for the predictor that includes morphology. For both quantities, closer to zero is better, positive numbers denote overpredictions, and negative values are underpredictions. The figure only includes galaxies from the test set. The dashed lines show 0.15 dex errors.