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Likelihood/Covariance
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Covariance matrices can get really large. In the simplest case, however, they are mostly diagonal and rather sparse.
This PR implements the use of SciPy sparse matrices for IMAGINE covariances.
The following items need to be adjusted or refactored before this PR is merged:
tools.covariance_estimator.oas_covtools.covariance_estimator.oas_mcovtools.parallel_ops.plu_solvelikelihoods.ensemble_likelihood.EnsembleLikelihood(check around vdot)likelihoods.simple_likelihood.SimpleLikelihood( (check around vdot)