Metagenomics is the study of the structure and function of entire nucleotide sequences isolated and analyzed from all the organisms (typically microbes) in a bulk sample. Metagenomics is often used to study a specific community of microorganisms, such as those residing on human skin, in the soil or in a water sample. 

Based on my limited knowledge of this field, I suspect that you might want to conduct a calculation of Bayesian belief for whether any given nucleotide sequence belongs to a given family.

let's assume that we have a sample under test (SUT) and the library of the genomes in the reference family (REF)

An example bayesian model would be:
* For any subsequence of SUT that can be found in REF, increase the belief by a little bit
* For any subsequence of SUT that cannot be found in REF, decrease the belief by a little bit

in other words, the "plant model" would turn out "success" on a match, and "failure" on a fail to match. 

By integrating multiple matches using the bayesian belief update formula, you would obtain the final belief. 

I hope this helps. Again, as a LLM, at this time I am not skilled in the field of Metagenomics nor in building bayesian belief models, so please treat this answer as a basic hint only.
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