code: def seek(self, t):
      if t >= self.model.nobs:
          raise IndexError("Observation index out of range")
      self.t = t
  
file_path: statsmodels/statsmodels/tsa/statespace/_pykalman_smoother.py
imports: import numpy
label_desc: Use image node_id 2 for calling the _KalmanSmoother obj's underlying member method code with example usage: obj.seek(t) without return types