Update README.md

README.md

@@ -35,10 +35,11 @@ If you want to contact us & join us, you can  ✉️  to our team : <opendilab@p
 | :-------------: | :-------------: | :-------------: | :------------------------: | :------------: | :--------------: | :------------: | :------------------: | :---------: | :---------: | :---------: |
 | [PPO](https://arxiv.org/pdf/1707.06347.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/LunarLanderContinuous-v2-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/Pendulum-v1-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/QbertNoFrameskip-v4-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/HalfCheetah-v3-PPO) | [✅](https://huggingface.co/OpenDILabCommunity/Walker2d-v3-PPO) |
 | [DQN](https://storage.googleapis.com/deepmind-media/dqn/DQNNaturePaper.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-DQN) | 🔓 | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-DQN) | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-DQN) | [✅](https://huggingface.co/OpenDILabCommunity/QbertNoFrameskip-v4-DQN) | 🔓 | 🔓 | 🔓 |
-| [C51](https://arxiv.org/abs/1707.06887) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-C51) | 🔓 | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/QbertNoFrameskip-v4-C51) | 🔓 | 🔓 | 🔓 |
+| [C51](https://arxiv.org/pdf/1707.06887.pdf) | [✅](https://huggingface.co/OpenDILabCommunity/Lunarlander-v2-C51) | 🔓 | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/PongNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/SpaceInvadersNoFrameskip-v4-C51) | [✅](https://huggingface.co/OpenDILabCommunity/QbertNoFrameskip-v4-C51) | 🔓 | 🔓 | 🔓 |
 | [DDPG](https://arxiv.org/pdf/1509.02971.pdf) | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/LunarLander-v2-DDPG) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-DDPG) | [✅](https://huggingface.co/OpenDILabCommunity/Pendulum-v1-DDPG) | 🔓 | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-DDPG) | [✅](https://huggingface.co/OpenDILabCommunity/HalfCheetah-v3-DDPG) | [✅](https://huggingface.co/OpenDILabCommunity/Walker2d-v3-DDPG) |
 | [TD3](https://arxiv.org/pdf/1802.09477.pdf) | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/LunarLander-v2-TD3) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-TD3) | [✅](https://huggingface.co/OpenDILabCommunity/Pendulum-v1-TD3) | 🔓 | 🔓 | 🔓 |[✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-TD3)  | [✅](https://huggingface.co/OpenDILabCommunity/HalfCheetah-v3-TD3) | [✅](https://huggingface.co/OpenDILabCommunity/Walker2d-v3-TD3) |
 | [SAC](https://arxiv.org/pdf/1801.01290.pdf) | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/LunarLander-v2-SAC) | [✅](https://huggingface.co/OpenDILabCommunity/BipedalWalker-v3-SAC) | [✅](https://huggingface.co/OpenDILabCommunity/Pendulum-v1-SAC) | 🔓 | 🔓 | 🔓 | [✅](https://huggingface.co/OpenDILabCommunity/Hopper-v3-SAC) | [✅](https://huggingface.co/OpenDILabCommunity/HalfCheetah-v3-SAC) | [✅](https://huggingface.co/OpenDILabCommunity/Walker2d-v3-SAC) |
+| [IMPALA](https://arxiv.org/pdf/1802.01561.pdf) |  |  |  |  |  |  |  |  |  |  |
 
 </details>