fwiw, based on recently closed bio ...

Here a better metric would be RMSE of log of CPI and log of prediction.

At least here variance is relatively low, so no big deal ... but perhaps please be careful when you select evaluation metric.

@skaak my good sir! we need to stop meeting like this( in competitions), hahaha!. I recently joined the second month of the competiton seeing what this steely eyed dragon can do. Glad to see you're still around and kicking!