code: def argus_gamma_inv_trf(x, chi):
      if chi <= 5:
          return x
      return 0.5 * chi**2 * (1 - x**2)
  
imports: import math
  import numbers
  import numpy
  from scipy import stats
  from scipy import special
  from ._qmc import check_random_state, Halton, QMCEngine
  from ._unuran.unuran_wrapper import NumericalInversePolynomial
  from scipy._lib._util import check_random_state
label_desc: Use image node_id 3 for calling a global function with example usage: argus_gamma_inv_trf(x, chi) and returns: unknown, x