code: def instantiate(self, parallel_envs, seed=0, preset='default') -> VecEnv:
          
          envs = DummyVecEnv([self._creation_function(i, seed, preset) for i in range(parallel_envs)])
  
          if self.frame_history is not None:
              envs = VecFrameStack(envs, self.frame_history)
  
          return envs
docs: Create vectorized environments