[Feature] Stacking specs #892
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# Conflicts: # test/test_specs.py
Co-authored-by: Tom Begley <tomcbegley@gmail.com>
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Description
Stacking specs is a mileston in allowing for multi-task and multi-agent env wrappers.
This PR introduces two classes:
LazyStackedTensorSpec: represents a stack of tensorspecs. It does not require them to be homogeneous in shape but we don't support different spec type.LazyStackedCompositeSpec, which inherits from the one above, but has extra key-features. Its (random) samples are of theLazyStackedTensorDicttype.The supported operations are:
cloneexpandtorandzeroIndexing can be performed along the stack dimension only. If the indexing is attempted along another dimension, an error will be thrown. This means that a stack of a stack can be indexed but only in the right order.
TODO: