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I wouldn't expect that the neurons are orthogonal on a set of features which we find interesting (sentiment, geographical location). They could be bound up in some other basis of features that we do not find interesting. Other people do not expect this because there are papers about how to incentivize neurons to correspond to interesting features.

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>> Other people do not expect this because there are papers about how to incentivize neurons to correspond to interesting features.

Could you clarify that statement? Are you saying that it was unusual for this group to find such a neuron? Also, I did not know that there are papers on how to incentivize neurons to correspond to interesting features. Could you please give me some references on those?

The paper I was thinking of is called: "InfoGAN: Interpretable Representation Learning by Information Maximizing Generative Adversarial Nets"[0]. I do not have experience training and investigating neural nets, but from what I read in that paper, there's no reason to presume you'll find neurons that represent a feature you're interested in. In the paper they alter the reward function to get neurons that correspond to the features they are interested in.

[0] https://arxiv.org/pdf/1606.03657v1.pdf

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