[BugFix] GNN position and velocity key #132
Merged
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This PR amends #125 which suggested to include position key and velocity key in gnns in the info dict.
This solution is not feasible as torchrl impedes access to this information in some losses.
The current supported way to include these keys in as part of the observations.
This will however require the GNN to be the first in the sequence if
SequenceModel
is used