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Memory architectures and persistent state

Working memory, episodes, semantic knowledge, and persistent state have different write, retrieval, and expiry lifecycles.

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Video summary

The ideas to retain

01

Working state: what execution needs now

Let \(Wt\) denote the working set used for one concrete decision. It may contain:

02

Episodic memory: events situated in time

Episodic memory represents something that happened. A useful episode usually retains at least:

03

Semantic memory: consolidated knowledge, not copied history

Semantic memory represents knowledge we want to reuse without replaying every episode that produced it.

Key moments

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  1. Four memories, four lifecycles
  2. Writing requires a policy
  3. Retrieving does not mean trusting