- fix 2 warning in doctest
- change the minimum version of gym (to be aligned with openai baselines)
- change squeeze and reshape to flatten (related to #155). I think flatten is better.
- The original `r - v`'s shape in A2C is wrong.
- The shape of log_prob is different: [bsz] in Categorical and [bsz, 1] in Normal. Should manually make the shape to be consistent with other tensors.
Add class BaseNoise and GaussianNoise for the concept of exploration noise.
Add new test for sac tested in MountainCarContinuous-v0,
which should benefits from the two above new feature.
* Enable to convert Batch data back to torch.
* Add torch converter to collector.
* Fix
* Move to_numpy/to_torch convert in dedicated utils.py.
* Use to_numpy/to_torch to convert arrays.
* fix lint
* fix
* Add unit test to check Batch from/to numpy.
* Fix Batch over Batch.
Co-authored-by: Alexis Duburcq <alexis.duburcq@wandercraft.eu>
