# Training feature classifiers
**URL:** https://forum.qiime2.org/t/training-feature-classifiers/14937
**Category:** User Support
**Tags:** feature-classifier
**Created:** [May 14, 2020, 6:15pm UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937 "2020-05-14T18:15:11Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@ptalebic](https://forum.qiime2.org/u/ptalebic)
#### Post date: [May 14, 2020, 6:15pm UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937/1 "2020-05-14T18:15:11Z")
Hi,
I am going to train my classifier. Based on [this](https://docs.qiime2.org/2019.10/tutorials/feature-classifier/) I need two elements: the reference sequences and the corresponding taxonomic classifications. I downloaded the reference sequences (Greengenes 13\_8 most recent) from [here](https://docs.qiime2.org/2019.10/data-resources/)
1- I was wondering where can I obtain the corresponding taxonomic classification. Can I use the one provided [here](https://docs.qiime2.org/2019.10/tutorials/feature-classifier/)?
2- The file I downloaded (Greengenes 13\_8 most recent), after decompressing it I notice that there are many files in it. Which one should I use? Or I guess I should import it as a compressed file for traning my classifier?
Sorry for my silly questions
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### Author:  [@andrewsanchez](https://forum.qiime2.org/u/andrewsanchez)
#### Post date: [May 14, 2020, 11:21pm UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937/2 "2020-05-14T23:21:31Z")
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### Author:  [@andrewsanchez](https://forum.qiime2.org/u/andrewsanchez)
#### Post date: [May 20, 2020, 6:19pm UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937/4 "2020-05-20T18:19:57Z")
Hi, @ptalebic 👋
Applying the workflow documented in [Feature classifier tutorial](https://docs.qiime2.org/2019.10/tutorials/feature-classifier/) can be a bit confusing at first. Luckily, there are already some discussions here on the forum about these points of confusion! Searching the forum for terms like "Greengenes" and "taxonomic classification" etc. will yield some helpful results:
Here are a few links with discussion relevant to your specific questions to get you started:
> [@questions on the use of 16s greengenes database](https://forum.qiime2.org/t/questions-on-the-use-of-16s-greengenes-database/11586):
>
> Hi, everyone. I am Mavis, sorry to bother you, I really need some help. Today I want to generate taxonomy.qza with greengenes 16s database, and I downloaded the newest greengenes 16S rRNA database from the [data resources page](https://docs.qiime2.org/2019.7/data-resources/#taxonomy-classifiers-for-use-with-q2-feature-classifier) and chose the one named [13\_8](ftp://greengenes.microbio.me/greengenes_release/gg_13_5/gg_13_8_otus.tar.gz). I noticed the words which say before I use this, I need to import it into artifacts. So I unzip the gz file. However I can't see the unzipped file type from my computer . So my question is, what is the type of this file and what command sho…
> [@Importing 13\_8 Greengenes database for training classifier](https://forum.qiime2.org/t/importing-13-8-greengenes-database-for-training-classifier/12097):
>
> Hi, I have a general question about importing the 13\_8 Greengenes database into QIIME2 in order to train it as a classifier. I am using QIIME2 version 2019.1 on VirtualBox on a Mac. I clicked the link from the data resources page, and the resulting files are in my downloads as gg\_13\_8\_otus.tar.gz and gg\_3\_8\_otus.tar.gz.cpgz My question is what is the import command to import the database into QIIME? I've looked around the forum and at the training classifier/importing data pages, but I can't …
Best of luck!
Andrew
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### Author:  [@andrewsanchez](https://forum.qiime2.org/u/andrewsanchez)
#### Post date: [May 20, 2020, 6:20pm UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937/5 "2020-05-20T18:20:01Z")
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### Author:  [@system](https://forum.qiime2.org/u/system)
#### Post date: [June 21, 2020, 12:30am UTC](https://forum.qiime2.org/t/training-feature-classifiers/14937/6 "2020-06-21T00:30:29Z")
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