docstr: Computes the intrisic diffusivity from the mean signal diffusional
  kurtosis parameters assuming the 2-compartmental spherical mean
  technique model [1]_, [2]_
  
  Returns
  -------
  smt2di : ndarray
      Intrinsic diffusivity computed by converting MSDKI to SMT2.
  
  Notes
  -----
  Computes the intrinsic diffusivity using equation 16 of [1]_
  
  References
  ----------
  .. [1] Neto Henriques R, Jespersen SN, Shemesh N (2019). Microscopic
         anisotropy misestimation in spherical‐mean single diffusion
         encoding MRI. Magnetic Resonance in Medicine (In press).
         doi: 10.1002/mrm.27606
  .. [2] Kaden E, Kelm ND, Carson RP, et al. (2016) Multi‐compartment
         microscopic diffusion imaging. Neuroimage 139:346–359.
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code: def smt2di(self):
      r"""
      Computes the intrisic diffusivity from the mean signal diffusional
      kurtosis parameters assuming the 2-compartmental spherical mean
      technique model [1]_, [2]_
  
      Returns
      -------
      smt2di : ndarray
          Intrinsic diffusivity computed by converting MSDKI to SMT2.
  
      Notes
      -----
      Computes the intrinsic diffusivity using equation 16 of [1]_
  
      References
      ----------
      .. [1] Neto Henriques R, Jespersen SN, Shemesh N (2019). Microscopic
             anisotropy misestimation in spherical‐mean single diffusion
             encoding MRI. Magnetic Resonance in Medicine (In press).
             doi: 10.1002/mrm.27606
      .. [2] Kaden E, Kelm ND, Carson RP, et al. (2016) Multi‐compartment
             microscopic diffusion imaging. Neuroimage 139:346–359.
      """
      return 3 * self.msd / (1 + 2 * (1 - self.smt2f) ** 2)
  
imports: import numpy
  import scipy.optimize
  from dipy.core.gradients import check_multi_b, unique_bvals_magnitude, round_bvals
  from dipy.reconst.base import ReconstModel
  from dipy.reconst.dti import MIN_POSITIVE_SIGNAL
  from dipy.core.ndindex import ndindex
  from dipy.core.onetime import auto_attr
label_desc: Use image node_id 7 for calling the MeanDiffusionKurtosisFit obj's underlying member method code with example usage: obj.smt2di() and returns: unknown