code: def mmf(x, alpha, beta, kappa, delta):
      """Morgan-Mercer-Flodin
      http://www.pisces-conservation.com/growthhelp/index.html?morgan_mercer_floden.htm
  
      Parameters
      ----------
      x : int
      alpha : float
      beta : float
      kappa : float
      delta : float
  
      Returns
      -------
      float
          alpha - (alpha - beta) / (1. + (kappa * x)**delta)
      """
      return alpha - (alpha - beta) / (1.0 + (kappa * x) ** delta)
  
file_path: nni/nni/algorithms/hpo/curvefitting_assessor/curvefunctions.py
imports: import numpy
label_desc: Use image node_id 8 for calling a global function with example usage: mmf(x, alpha, beta, kappa, delta) and returns: unknown