code: def _init_table(self):
          
          self.observation_table.sm_vector.append(self.epsilon)
          self.observation_table.smi_vector = list(self.alphabet)
          self.observation_table.em_vector.append(self.epsilon)
  
          self._fill_table_entry(self.epsilon, self.epsilon)
          for s in self.observation_table.smi_vector:
              self._fill_table_entry(s, self.epsilon)
docs: Initialize the observation table.