In short, it's both. I borrowed the idea from Bjork's New Theory of Disuse: each memory has two strengths. One decays with time, the other grows with successful recall and slows that decay.
The reranker is more of a final-stage relevance check than part of the forgetting itself.
The natural forgetting part caught my eye. Is the decay time based, driven by retrieval frequency, or scored by the reranker?
In short, it's both. I borrowed the idea from Bjork's New Theory of Disuse: each memory has two strengths. One decays with time, the other grows with successful recall and slows that decay. The reranker is more of a final-stage relevance check than part of the forgetting itself.