This is my adopted long-term field -- though professionally I work as a bitcoin developer right now -- and those estimates are my own. 1-2 decades is based on existing AGI work such as OpenCog, and what is known about generalizations to narrow AI being done by Google and a few smaller startups. It is reasonable extrapolations based on published project plans, the authors' opinions, and my own evaluation of the code in the case of OpenCog. 5 years is what it would take if money were not a concern. 2-years is based on my own, unpublished simplification of the CogPrime architecture meant as a blitz to seed-stage oracle AGI, under the same money-is-no-concern conditions.
I don't really entirely endorse the algorithms behind OpenCog and such, but I do share the forecasting timeline. Modern work in hierarchical learning, probabilities over sentences (and thus: learning and inference over structured knowledge), planning as inference... basically, I've been reading enough papers to say that we're definitely starting to see the pieces emerge that embody algorithms for actual, human-level cognition. We will soon confront the question, "Yes, we have all these algorithms, but how do we put them together into an agent?"
Cross-posted from my blog.
Yudkowsky writes:
My own projection goes more like this:
At least one clear difference between my projection and Yudkowsky's is that I expect AI-expert performance on the problem to improve substantially as a greater fraction of elite AI scientists begin to think about the issue in Near mode rather than Far mode.
As a friend of mine suggested recently, current elite awareness of the AGI safety challenge is roughly where elite awareness of the global warming challenge was in the early 80s. Except, I expect elite acknowledgement of the AGI safety challenge to spread more slowly than it did for global warming or nuclear security, because AGI is tougher to forecast in general, and involves trickier philosophical nuances. (Nobody was ever tempted to say, "But as the nuclear chain reaction grows in power, it will necessarily become more moral!")
Still, there is a worryingly non-negligible chance that AGI explodes "out of nowhere." Sometimes important theorems are proved suddenly after decades of failed attempts by other mathematicians, and sometimes a computational procedure is sped up by 20 orders of magnitude with a single breakthrough.