dt_sklearn quality issue

[mdmitry1]

For shekel test dt_sklearn provides the same prediction for significantly different objective function values
On below graph one can see all dataset values for predicted value equal to -1.0828780286852748
Reproduction:

mkdir -p /tmp/issue_21
cd -p /tmp/issue_21
git clone ssh://git@github.com/SMLP-Systems/smlp 
cd smlp
git switch SMLP_TUTORIAL 
cd tutorial/examples/shekel/smlp
run_shekel
egrep '\-1.0828780286852748' Shekel_Shekel_labeled_predictions_summary.csv | awk -F, '{print $1,$2}' | xgraph -nl -P /dev/stdin

xgraph installation instructions for Ubuntu 24.04

wget http://old-releases.ubuntu.com/ubuntu/pool/universe/x/xgraph/xgraph_12.1-17_amd64.deb
sudo apt install ./xgraph_12.1-17_amd64.deb