code: def init(self):
      self.line.set_data(
          range(int((self.means[0].shape[0] - self.start_index) / 2)),
          self.link(
              self.means[0][
                  self.start_index : -(
                      (self.means[0].shape[0] - self.start_index) / 2
                  )
              ]
          ),
      )
      return (self.line,)
  
imports: import sys
  import numpy
  import pandas
  import scipy.stats
  from scipy import optimize
  from ..None import inference
  from ..None import families
  from ..None import output
  from ..None import tsm
  from ..None import data_check
  from ..None import covariances
  from ..None import results
  from ..None import gas
  from .kalman import *
  from .llt import *
label_desc: Use image node_id 2 for calling the BBVINLLTAnimate obj's underlying member method code with example usage: obj.init() and returns: self