code: def linear(x, a, b):
      """linear
  
      Parameters
      ----------
      x : int
      a : float
      b : float
  
      Returns
      -------
      float
          a*x + b
      """
      return a * x + b
  
file_path: nni/nni/algorithms/hpo/curvefitting_assessor/curvefunctions.py
imports: import numpy
label_desc: Use image node_id 3 for calling a global function with example usage: linear(x, a, b) and returns: unknown