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Enum for actuator types (Specified in Relax/PositionCommand msgs)
Enum for position control modes (sent in PositionCommand msg)
Message containing the data for a single sample.
TODO - do we want this default here?
sample length
dimension of state X
dimension of action U
dimension of observation
Data arrays holding X, U, obs, and meta data.
Enum for sample types
initial image of the agent's environment.