difficulty understanding taxon assignment

[Nicholas_Bokulich]

Hi @Peter_Janampa ,

@Peter_Janampa

is it a issue because of "qiime feature-classifier classify-sklearn" or by Silva Database?

Neither, but more the SILVA database. See here:

Erroneous taxonomy from Silva classifier

Hi QIIME team! I have an issue with my classifier output, I searched around on the forum but could not find the answer (if it is here, sorry!). I have a marine 18S dataset that I am classifying using a subset of the silva-138-99-seqs.qza from QIIME data resources. The thing is that there is duplication in the taxonomic output, as seen below: [image] So from the 'class' onwards it is somehow giving the same result (Trebouxiophyceae or Ulvophyceae in this example). I wonder what is going on he…

Note, if you really want to you can follow the tutorial at that link to create your own pre-trained classifier and turn off the rank propagation option... or you can just ignore the propagated ranks now that you know why they are there