Use System.opt.timestep instead of System.dt in basics notebook for compatibility with 0.10.4.
Install latest gym version (0.26.2) in training_torch notebook to replace old version installed by default in Colab (0.25.2). This fixes an error on env = gym_wrapper.VectorGymWrapper(env) caused by gym.vector.utils.batch_space.
System.opt.timestepinstead ofSystem.dtinbasicsnotebook for compatibility with 0.10.4.gymversion (0.26.2) intraining_torchnotebook to replace old version installed by default in Colab (0.25.2). This fixes an error onenv = gym_wrapper.VectorGymWrapper(env)caused bygym.vector.utils.batch_space.