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Adds outer dimensions to the shape of input specs.
tf_agents.specs.tensor_spec.add_outer_dims_nest( specs, outer_dims )
specs: Nested list/tuple/dict of TensorSpecs/ArraySpecs, describing the shape of tensors.
outer_dims: a list or tuple, representing the outer shape to be added to the TensorSpecs in specs.
Nested TensorSpecs with outer dimensions added to the shape of input specs.
ValueError: if any outer_dims is neither a list nor tuple.