// desc = used only in ``binary`` and ``multiclassova``
// desc = set this to ``true`` if training data are unbalanced
// desc = set this to ``true`` if training data are unbalanced
// desc = **Note**: while enabling this should increase the overall performance metric of your model, it will also result in poor estimates of the individual class probabilities
// desc = **Note**: while enabling this should increase the overall performance metric of your model, it will also result in poor estimates of the individual class probabilities
// desc = **Note**: this parameter cannot be used at the same time with ``scale_pos_weight``, choose only **one** of them
// desc = **Note**: this parameter cannot be used at the same time with ``scale_pos_weight``, choose only **one** of them
boolis_unbalance=false;
boolis_unbalance=false;
// check = >0.0
// check = >0.0
// desc = used only in ``binary`` application
// desc = used only in ``binary`` and ``multiclassova``
// desc = weight of labels with positive class
// desc = weight of labels with positive class
// desc = **Note**: while enabling this should increase the overall performance metric of your model, it will also result in poor estimates of the individual class probabilities
// desc = **Note**: while enabling this should increase the overall performance metric of your model, it will also result in poor estimates of the individual class probabilities
// desc = **Note**: this parameter cannot be used at the same time with ``is_unbalance``, choose only **one** of them
// desc = **Note**: this parameter cannot be used at the same time with ``is_unbalance``, choose only **one** of them