docstr: Initialize a MeanDiffusionKurtosisFit class instance.
          
docstr_tok: ["Initialize","a","MeanDiffusionKurtosisFit","class","instance","."]
code: def __init__(self, model, model_params, model_S0=None):
      """Initialize a MeanDiffusionKurtosisFit class instance."""
      self.model = model
      self.model_params = model_params
      self.model_S0 = model_S0
  
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 1 to create a new MeanDiffusionKurtosisFit object  with example: obj = MeanDiffusionKurtosisFit(model, model_params, model_S0)