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Operating System: Ubuntu Linux; Version: Commit c198761

Hey,

I am using tianshou as a submodule in a different project. There I use ShmemVectorEnv to simulate an environment. During training I would like to dynamically manipulate the environments by setting certain attributes to some values. Looking at the current code, this operation does not seem to be supported by the vector environments, is that correct? Is there some reason why BaseVectorEnv and the workers cannot implement a __setattr__ method?
Is there possibly some other solution to this problem or could such methods be implemented (I'd be happy to have a crack at it and raise a pull request)? Although I have not yet performed any benchmarks, I expect the cost of instantiating a new ShmemVectorEnv whenever I want to modify an attribute to be prohibitive.
Thanks for your help!

Best,
Markus