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Don't be fooled–LLMs don't reason

75 points · 159 comments · leopoldj

  1. f6v · · focus · HN ↗
    > Knowledge and reasoning are inextricably interwoven in the weights of the neural network—there is no independent, explicitly represented set of beliefs.

    I'm not sure I understand this. Do we have evidence humans have an independent set of beliefs not shaped by knowledge and reasoning? If so, where do these come from?

    I'm especially confused about a prior statement as a scientist:

    > Three shortcomings prevent what chatbots do from qualifying as reasoning (in a way that a scientist might recognize).

    How does a set of beliefs help with reasoning?

    > Third, while the chains of thought chatbots produce look like deliberation, research has demonstrated that the bots often concoct them after the fact, reaching an answer by one route but reporting another.

    We also often do the same as humans.

    1. leopoldj · · focus · HN ↗
      Philosophers like Kant, Descartes and Locke wanted to draw a distinction between a priori and a posteriori beliefs (or knowledge). I believe AI will be very much bound by these discussions. Some knowledge can be had purely by reason. Some other knowledge will require observations.
      1. nateb2022 · · focus · HN ↗
        Consider a calculator, a machine capable of valid transformations wrt the semantics of arithmetic.

        Does a calculator reason its way to 2 + 2 = 4? No, it merely transforms.

        An LLM is simply a much more complex version of this; except that its complexity hides a lot of what is otherwise reducible to a transformation of semantic, conceptual, and inferential relations. There are lots of NLP models prior to the introduction of modern "AI" that would make these representations more clear.

        However I don't believe any of the aforementioned philosophers would ever consider reason itself as a transformation, as Kant especially spent a lot of time differentiating apprehension from transition.

        1. f6v · · focus · HN ↗
          > Does a calculator reason its way to 2 + 2 = 4? No, it merely transforms.

          Yes, it reasons through machine instructions in the silicone.

          Can someone explain how we reason that 2+2 is 4.

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