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The bulk of the review for O4 is focusing on sampler settings that give good performance on the expected CBC population. See [this wiki](https://git.ligo.org/pe/O4/bilby_o4_review/-/wikis/home) for more details.
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There are a few significant code changes that need review/review documentation though. This wiki is intended to provide a home for these things.
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Many of these features have unit tests verifying their performance, others have dedicated review wikis.
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## Significant changes
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- Optimized Cython geometric functions: [bilby-cython](https://git.ligo.org/colm.talbot/bilby-cython) is reviewed in [issues](https://git.ligo.org/colm.talbot/bilby-cython/-/issues/?sort=updated_desc&state=closed&first_page_size=20).
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- Sampling in aligned and planar spin components (https://git.ligo.org/lscsoft/bilby/-/merge_requests/868)
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- Various improvements to ROQ likelihood (https://git.ligo.org/lscsoft/bilby/-/merge_requests/1093, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1216, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1196)
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- multibanding likelihood (https://git.ligo.org/lscsoft/bilby/-/merge_requests/972, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1171)
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- relative binning (heterodyning) likelihood (https://git.ligo.org/lscsoft/bilby/-/merge_requests/1105, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1186, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1198, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1211)
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- Likelihood marginalization
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- calibration: (https://git.ligo.org/lscsoft/bilby/-/merge_requests/856, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1201, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1234)
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- ROQ time marginalization: (https://git.ligo.org/lscsoft/bilby/-/merge_requests/1040)
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- `dynesty` sampling (https://git.ligo.org/lscsoft/bilby/-/merge_requests/1187, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1222, https://git.ligo.org/lscsoft/bilby/-/merge_requests/1225)
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- likelihood reweighting |
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\ No newline at end of file |
