# SysVI model and normalized expression

**URL:** <https://discourse.scverse.org/t/sysvi-model-and-normalized-expression/3543>\
**Category:** scvi-tools\
**Tags:** integration, scvi\
**Created:** [March 14, 2025, 4:43am UTC](https://discourse.scverse.org/t/sysvi-model-and-normalized-expression/3543 "2025-03-14T04:43:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![danieljrichard](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.scverse.org/danieljrichard/32/1332_2.png) [@danieljrichard](https://discourse.scverse.org/u/danieljrichard)\
**Post date:** [March 14, 2025, 4:43am UTC](https://discourse.scverse.org/t/sysvi-model-and-normalized-expression/3543/1 "2025-03-14T04:43:22Z")

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Hello, I was working through this example for running SysVI:

> **[Integration of scRNA-seq data with substantial batch effects using sysVI](https://docs.scvi-tools.org/en/stable/tutorials/notebooks/scrna/sysVI.html)**
>
> This tutorial shows how to integrate scRNA-seq datasets with substantial batch effects (here referred to as systems), such as cross-species, cross-technology (e.g. cells and nuclei), and primary ti...

And tried running get\_normalized expression. However, I get this error:  
AttributeError: ‘SysVI’ object has no attribute ‘get\_normalized\_expression’

However, the API indicates this is an attribute:

> **[scvi.external.SysVI](https://docs.scvi-tools.org/en/latest/api/reference/scvi.external.SysVI.html#scvi.external.SysVI.get_normalized_expression)**
>
> Attributes table: Methods table: Attributes: Methods:

Am I doing something wrong, or do I somehow need to convert this SysVI object to a scvi object?

Any help would be greatly appreciated!

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**Author:** ![cane11](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.scverse.org/cane11/32/241_2.png) [@cane11](https://discourse.scverse.org/u/cane11)\
**Post date:** [March 15, 2025, 7:32am UTC](https://discourse.scverse.org/t/sysvi-model-and-normalized-expression/3543/2 "2025-03-15T07:32:36Z")

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See GitHub issue. Please mark if you double post this makes it easier for the community.