You can apply the nonlinear transformation either to the rewards or to the Q values. The aggregation can occur only after transformation. When transformation is applied to Q values then the aggregation takes place quite late in the process - as Ben said, during action selection.
Both the approach of transforming the rewards and the approach of transforming the Q values are valid, but have different philosophical interpretations and also have different experimental outcomes to the agent behaviour. I think both approaches need more research.
For example, I wou...
I agree, sounds plausible that this could happen. Likewise as we humans may build a strongly optimising agent because we are lazy and want to use simpler forms of maths. The tiling agents problem is definitely important.
That being said, agents properly understanding and modelling homeostasis is among the required properties (thus essential). It is not meant to be sufficient one. There may be no single sufficient property that solves everything, therefore there is no competition between different required properties. Required properties are conjunctive, the... (read more)