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About this paper

Charles Jin, Martin Rinard

Researchers at MIT CSAIL developed Latent Causal Probing, a formal framework using structural causal models and causal mediation analysis to rigorously assess whether language models represent latent variables from their training data. Their empirical study on a synthetic grid-world task showed that LMs do induce these unobserved concepts, providing positive mediated measurements for both deductive knowledge and inductive generalization to unseen data.

Key insights

  • Language models can learn and represent the latent causal structures of their training data, inferring unobserved concepts.
  • Higher capacity probes (MLPs) can extract more of the encoded latent information from LMs, but a positive causal effect can still be demonstrated.
  • Raw probing accuracy can be misleading, as high accuracy does not automatically imply that the LM causally encodes the information; mediated measurements are necessary for robust conclusions.

Summary by alphaXiv.

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