code: def Lanczos(b, x, y=0):
      b = read_params(b)
      model = (
          b[0] * exp(-b[1] * x)
          + b[2] * exp(-b[3] * x)
          + b[4] * exp(-b[5] * x)
      )
      return model - y
  
imports: import os
  from numpy import arctan, array, cos, exp, log, sin
  from lmfit import Parameters
label_desc: Use image node_id 11 for calling a global function with example usage: Lanczos(b, x, y) and returns: unknown