SysVI tutorial

[Hrovatin]

Associated with scverse/scvi-tools#2383

Formatting

• [ x] My tutorial has only one top-level (#) header

Reproducibility

• My tutorial works on Google Colab
  Could you help with this?
• [x ] My tutorial sets scvi.settings.seed = 0 at the beginning of the notebook
• [x ] My tutorial has been run and includes outputs (e.g. plots, tables)

Other

• [x ] Counts and normalized data should co-exist in the datasets, see the API overview for an example
• [ x] For scRNA-seq data, normalization should be counts per median library size and then log1p transformed -- if not, a reason should be given
  Data is normalized to fixed number of total counts as it was normalized separately for mouse and human. If median library size was used for normalization the two datasets would not be comparable.

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[martinkim0]

I'm approving this for now, but this needs to be run again once scverse/scvi-tools#2421 is merged into main since we require that tutorials are run top to bottom in a container.