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data-analysis's Issues

k means clustering produces empty clusters

k means empty cluster
https://github.com/DoYouEvenStackSmash/data-analysis/blob/4d42a33719890f4ec7719a1dd8bc50e4dc9e18d2/src/python-processing/kmeans.py#L71C4-L71C4

early stop condition:

# TODO: Investigate Estop behavior

Currently it is possible for the number of centroids to decrease during iterations of k means. This is permissible and triggers an early stop condition, which greatly improves performance but possibly at the cost of soundness. more investigation required to determine whether this is important for overall good clustering and tree search.

incorrect likelihoods?

Currently I calculate likelihoods by doing the following:

def likelihood(omega, m, N_pix, noise=1):

image

The paper suggests another which... is a little harder to reason about considering we don't have any kind of temporal ordering in the data as far as I know
image

Maybe we're supposed to do some numerical technique overall for the posterior integration, it seems the likelihood is incorrect.

What to do?

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