Add Meta-World example

[Kostis-S-Z]

MAML-TRPO on Meta-world (#105 )

Meta-World Wrapper (adds to core library)

Since the Meta-World environment does not use the functionality of done (see more in this issue) but the cherry Runner assumes that at the end of the horizon (end of the episode length) the environment sends done=True a small modification to re-enable this feature was needed in order to make it compatible.

Example

A simple MAML-TRPO example on the meta-learning multi-tasking benchmark environment Meta-world. This example inherits its structure from the maml_trpo.py file.

In the main() function through the benchmark parameter, the user can choose to test the code on the 3 benchmark environments of Meta-world: ML1, ML10, ML45.

Contribution Checklist

If your contribution modifies code in the core library (not docs, tests, or examples), please fill the following checklist.

• My contribution modifies code in the main library.
• My modifications are tested.
• My modifications are documented.

[seba-1511]

Hi @Kostis-S-Z,

Thanks for the PR, it looks great. I've added a small request for documentation, so that we can also include MetaWorld on the website. Maybe we should also think about including graphs for those examples on this page -- let's sync on slack to discuss that.

[seba-1511]

Thanks a lot for this contribution, it looks great!