hpo.fedex.eta0:
  type: cate
  choices: [-1.0, 0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1.0]
hpo.fedex.gamma:
  type: float
  lower: 0.0
  upper: 1.0
  log: False
hpo.fedex.diff:
  type: cate
  choices: [True, False]