code: def check(para, real_val, sig=3):
      err = abs(para.value - real_val)
      assert err < sig * para.stderr
  
file_path: lmfit-py/tests/test_covariance_matrix.py
imports: import os
  import numpy
  from numpy import pi
  from numpy.testing import assert_allclose, assert_almost_equal
  import pytest
  from lmfit import Parameters, minimize
  from lmfit.lineshapes import exponential
  from lmfit.models import ExponentialModel, LinearModel, VoigtModel
label_desc: Use image node_id 1 for calling a global function with example usage: check(para, real_val, sig) without return types