config.yml

models:
  xgboost:
    type: lambdamart
    backend:
      type: xgboost
    weights:
      click: 1
    features:
      - bm25
      - cos

features:
  - name: bm25
    type: number
    scope: item
    field: item.bm25
  - name: cos
    type: number
    scope: item
    field: item.cos