# class-weight parameter for rescript-evaluate evaluate-fit-classifier function

**URL:** https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320
**Category:** User Support
**Tags:** rescript-evaluate
**Created:** [September 9, 2026, 1:06am UTC](https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320 "2026-09-09T01:06:32Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![irvinng98](https://forum.qiime2.org/user_avatar/forum.qiime2.org/irvinng98/32/14901_2.png) [@irvinng98](https://forum.qiime2.org/u/irvinng98)
#### Post date: [September 9, 2026, 1:06am UTC](https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320/1 "2026-09-09T01:06:32Z")

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Hello,

Previously I had used the `qiime feature-classifier fit-classifier-naive-bayes` function as the last step to create my classifier. This function allowed me to use --i-class-weight as an option for input. However, I noticed that the newer `qiime rescript-evaluate evaluate-fit-classifier` function doesn't have this parameter. Is there another step that I'm missing with the rescript-evaluate plugin?

```auto
$ qiime --version
q2cli version 2026.4.0

$ qiime rescript-evaluate --version
QIIME 2 Plugin 'rescript-evaluate' version 2026.4.0 (from package 'rescript_evaluate' version 2026.4.0)

```

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<div class="post-metadata">

### Author: ![SoilRotifer](https://forum.qiime2.org/user_avatar/forum.qiime2.org/soilrotifer/32/21071_2.png) [@SoilRotifer](https://forum.qiime2.org/u/SoilRotifer)
#### Post date: [September 9, 2026, 12:58pm UTC](https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320/2 "2026-09-09T12:58:04Z")

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Hi @irvinng98,

~~The `--i-class-weight` parameter was not exposed in `rescript-evaluate evaluate-fit-classifier`. I've opened an issue [here](https://github.com/mikerobeson/rescript-evaluate/issues/2).~~

EDIT: See following comment.

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### Author: ![SoilRotifer](https://forum.qiime2.org/user_avatar/forum.qiime2.org/soilrotifer/32/21071_2.png) [@SoilRotifer](https://forum.qiime2.org/u/SoilRotifer)
#### Post date: [September 9, 2026, 5:15pm UTC](https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320/3 "2026-09-09T17:15:53Z")

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Hi @irvinng98, after a quick discussion with @Nicholas_Bokulich, adding the option `--i-class-weight` to `qiime rescript-evaluate evaluate-fit-classifier` will likely lead to misleading results, as to properly test a weighted classifier requires a more sophisticated setup. Thus, it is recommended that the more appropriate `evaluate-classifications` via `qiime rescript evaluate-classifications` be run on your weighted / bespoke classifier.

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### Author: ![irvinng98](https://forum.qiime2.org/user_avatar/forum.qiime2.org/irvinng98/32/14901_2.png) [@irvinng98](https://forum.qiime2.org/u/irvinng98)
#### Post date: [September 22, 2026, 9:00pm UTC](https://forum.qiime2.org/t/class-weight-parameter-for-rescript-evaluate-evaluate-fit-classifier-function/34320/4 "2026-09-22T21:00:32Z")

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Got it. Thank you so much for your help!