The X-axis of the prediction histogram in AI Studio likely represents normalized residuals. The label "Y_pred - Y_actual" suggests it's the difference between predicted and actual values, but the values being between -1 and 1 indicates normalization: Normalized Residuals: It could be (Y_pred - Y_actual) / Y_max, where Y_max is the maximum actual value, keeping the range within -1 to 1. Relative Errors: It might also be (Y_pred - Y_actual) / Y_actual, scaled to fit between -1 and 1. I hope this will work for you.....
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