- used only in ``lambdarank`` application when positional information is provided and position bias is modeled. Larger values reduce the inferred position bias factors.
- used only in ``lambdarank`` application when positional information is provided and position bias is modeled. Larger values reduce the inferred position bias factors.
// desc = used only in ``lambdarank`` application when positional information is provided and position bias is modeled. Larger values reduce the inferred position bias factors.
// desc = used only in ``lambdarank`` application when positional information is provided and position bias is modeled. Larger values reduce the inferred position bias factors.