code: def _run(self):
      S = Segmentation(
          self.data,
          mask=self.mask,
          mu=self.init_mu,
          sigma=self.init_sigma,
          ngb_size=self.ngb_size,
          beta=self.beta,
      )
      S.run(niters=self.niters)
      self.mu = S.mu
      self.sigma = S.sigma
      self.ppm = S.ppm
  
imports: import numpy
  from .segmentation import Segmentation, map_from_ppm, moment_matching
label_desc: Use image node_id 3 for calling the BrainT1Segmentation obj's underlying member method code with example usage: obj._run() without return types