code: def explicit_fjb(self, B, x):
      eBx = np.exp(B[2] * x)
      res = np.vstack(
          [
              np.ones(x.shape[-1]),
              np.power(eBx - 1.0, 2),
              B[1] * 2.0 * (eBx - 1.0) * eBx * x,
          ]
      )
      return res
  
imports: from __future__ import division, print_function, absolute_import
  import numpy
  from numpy import pi
  from numpy.testing import assert_array_almost_equal, assert_equal, assert_warns
  from pytest import raises
  from scipy.odr import Data, Model, ODR, RealData, OdrStop, OdrWarning
label_desc: Use image node_id 6 for calling the TestODR obj's underlying member method code with example usage: obj.explicit_fjb(B, x) and returns: res