Comments (2)
That's right, the naive message passing algorithms compute in probability space, and products of probabilities can go to zero very quickly. We're working in log probability space, which incurs a bit of extra cost but gives numerical stability. I should also note that there are algorithms that work in probability space but renormalize the messages at each step. These would probably also suffice, and might be a tad bit faster, but I haven't implemented them.
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Thank you for the clarification!
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