code: def ilog2(x, c, a):
      """ilog2
  
      Parameters
      ----------
      x : int
      c : float
      a : float
  
      Returns
      -------
      float
          c - a / np.log(x)
      """
      return c - a / np.log(x)
  
file_path: nni/nni/algorithms/hpo/curvefitting_assessor/curvefunctions.py
imports: import numpy
label_desc: Use image node_id 10 for calling a global function with example usage: ilog2(x, c, a) and returns: unknown