code: def evalSymbReg(individual, points):
      # Transform the tree expression in a callable function
      func = toolbox.compile(expr=individual)
      # Evaluate the mean squared error between the expression
      # and the real function : x**4 + x**3 + x**2 + x
      sqerrors = (
          (func(x) - x**4 - x**3 - x**2 - x) ** 2 for x in points
      )
      return (math.fsum(sqerrors) / len(points),)
  
file_path: deap/examples/gp/symbreg.py
imports: import operator
  import math
  import random
  import numpy
  from functools import partial
  from deap import algorithms
  from deap import base
  from deap import creator
  from deap import tools
  from deap import gp
label_desc: Use image node_id 2 for calling a global function with example usage: evalSymbReg(individual, points) and returns: unknown