python_mozetl
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Ensure diversity sampling instead of random (proportionate) sampling
https://github.com/mozilla/python_mozetl/blob/32d78c34dbb3c9ff5542f1ebc110f5aeb7fce340/mozetl/taar/taar_similarity.py#L131
The diversity of the donor pool is only ensured by the assumption that higher level clustering is substantially diverse. This could be improved by verification of cross-cluster diversity in the addons space.