# How to get Greengenes reference into FeatureData\[Taxonomy\] format?
**URL:** https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953
**Category:** User Support
**Tags:** taxonomy, feature-classifier
**Created:** [January 22, 2022, 4:20am UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953 "2022-01-22T04:20:36Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Danielle\_Wang](https://forum.qiime2.org/u/Danielle_Wang)
#### Post date: [January 22, 2022, 4:20am UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953/1 "2022-01-22T04:20:36Z")
Hi, I want to use the "Training feature classifiers with q2-feature-classifier" using the **Reference Greengenes 13\_8 99% OTUs from 515F/806R region of sequences**
Here is the default code: but it doesn't work
qiime tools import
--type 'FeatureData[Taxonomy]'
--input-format HeaderlessTSVTaxonomyFormat
--input-path 85\_otu\_taxonomy.txt
--output-path ref-taxonomy.qza
How can I get the Greengenes Reference into **FeatureData[Taxonomy]** format?
Thanks.
---
### Author:  [@colinbrislawn](https://forum.qiime2.org/u/colinbrislawn)
#### Post date: [January 22, 2022, 4:27am UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953/2 "2022-01-22T04:27:58Z")
Hello Danielle,
Have you already discovered the [Training feature classifiers tutorial](https://docs.qiime2.org/2021.11/tutorials/feature-classifier/)? That includes a section on importing taxonomy txt files into the `FeatureData[Taxonomy]` format.
There is also [a pipeline](https://forum.qiime2.org/t/processing-filtering-and-evaluating-the-silva-database-and-other-reference-sequence-data-with-rescript/15494) that automates lots of this process, which is also worth a look! ⏩ 🎢
Let me know if you have any other questions!
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### Author:  [@Danielle\_Wang](https://forum.qiime2.org/u/Danielle_Wang)
#### Post date: [January 22, 2022, 7:54am UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953/3 "2022-01-22T07:54:04Z")
Hi, thanks for your reply!
I have tried the Training feature classifiers tutorial. That's where the problem comes in...
- my reference taxonomy is found here (4th one): [Data resources — QIIME 2 2021.11.0 documentation](https://docs.qiime2.org/2021.11/data-resources/).
- however, the format isn't compatible with the code that is documented in the tutorial. (it's not "HeaderlessTSVTaxonomyFormat")
- so the code gives me the error: _(1/1) Invalid value for '--i-reference-taxonomy': Expected an artifact of at least type FeatureData[Taxonomy]. An artifact of type TaxonomicClassifier was provided._
When I directly tried to Train the Classifer with the Greengenes QZA file, apparently, the given Greengenes in an artifact of type TaxonomicClassifier. The expected format is FeatureData[Taxonomy].
I'm stuck. Do you know of a solution for this? Thank you so much.
---
### Author:  [@colinbrislawn](https://forum.qiime2.org/u/colinbrislawn)
#### Post date: [January 22, 2022, 3:06pm UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953/4 "2022-01-22T15:06:56Z")
Oh, I get what's going on!
> [@Danielle\_Wang](#):
>
> - my reference taxonomy is found here (4th one): [Data resources — QIIME 2 2021.11.0 documentation](https://docs.qiime2.org/2021.11/data-resources/).
> ...
> When I directly tried to Train the Classifer with the Greengenes QZA file, apparently, the given Greengenes in an artifact of type TaxonomicClassifier. The expected format is FeatureData[Taxonomy].
The data resources page provides pre-trained classifiers that have already been through this step. So you don't have to import data or train them, you can just use them directly on the `classify-sklearn` step.
That tutorial starts from step 1:
Because you downloaded a `TaxonomicClassifier` .qza file from the data resources page, you can skip to step 4.
Here's the [full flowchart of the process](https://docs.qiime2.org/2021.11/tutorials/overview/#taxonomy-classification-and-taxonomic-analyses), if that's helpful.
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### Author:  [@system](https://forum.qiime2.org/u/system)
#### Post date: [February 22, 2022, 9:07pm UTC](https://forum.qiime2.org/t/how-to-get-greengenes-reference-into-featuredata-taxonomy-format/21953/5 "2022-02-22T21:07:35Z")
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