LSTM based policy in stable baselines3 model

I am trying to make a PPO model using the stable-baselines3 library. I want to use a policy network with an LSTM layer in it. However, I can't find such a possibility on the library's website although it exists on the previous version of stable-baselines here https://stable-baselines.readthedocs.io/en/master/modules/policies.html#stable_baselines.common.policies.MlpLstmPolicy.

Does this possibility exist in stable-baselines3 (not stable-baselines)? if not, is there any other possibility I can do this? Thanx.

Solution 1:

From the migration doc.

https://stable-baselines3.readthedocs.io/en/master/guide/migration.html

Breaking Changes¶

LSTM policies (MlpLstmPolicy, CnnLstmPolicy) are not supported for the time being (see PR #53 for a recurrent PPO implementation)