docstr: The parallel diffusivity
          
docstr_tok: ["The","parallel","diffusivity"]
code: def dpar(self):
      """The parallel diffusivity"""
      return self.d_par
  
imports: from warnings import warn
  import numpy
  from dipy.reconst.cache import Cache
  from dipy.reconst.multi_voxel import multi_voxel_fit
  from dipy.reconst.csdeconv import csdeconv
  from dipy.reconst.shm import real_sh_descoteaux_from_index
  from scipy.special import gamma, hyp1f1
  from dipy.core.geometry import cart2sphere
  from dipy.data import default_sphere
  from dipy.reconst.odf import OdfModel, OdfFit
  from scipy.optimize import leastsq
  from dipy.utils.optpkg import optional_package
label_desc: Use image node_id 7 for calling the ForecastFit obj's underlying member method code with example usage: obj.dpar() and returns: self