code: def naive_iac(width):
      height = width / 2
      a = height / ((width / 2) * (width / 2))
      b = height
      c = width / 2
      x = np.arange(width)
      y = -(a * (x - c) * (x - c)) + b
  
      return y
  
imports: import functools
  import naive
  import numpy
  import numpy.testing
  import pytest
  from stumpy import aamp, core, floss, fluss, stump
  from stumpy.floss import _cac, _iac, _nnmark, _rea
label_desc: Use image node_id 2 for calling a global function with example usage: naive_iac(width) and returns: y