single-cell-tools

single-cell-tools is a small toolkit for working with single-cell datasets locally or on a shared cluster. The repo centers around a Gradio app for generating embeddings, exploring datasets, downloading public data into a managed .data/ workspace, and kicking off Slurm jobs when the workload is too large for an interactive session.

Prerequisites

• Python 3.12+ (see requires-python in pyproject.toml)
• uv for environments and runs (uv sync, uv run …)

Optional: copy .env.example to .env and fill in only what you need (tokens, paths). .env is gitignored.

If you want to try it quickly, the shortest path is:

git clone <repository-url>
cd single-cell-tools
uv sync
uv run python main.py embeddings

You can launch the same Gradio UI by running the app module directly from the repo root:

uv run python app/app.py

main.py embeddings is a thin wrapper that runs app.app as a module (python -m app.app); using app/app.py skips the CLI and is handy in editors or when you only care about the embeddings UI.

Then open the URL Gradio prints (often http://127.0.0.1:7861), point the app at a server-side .h5ad, .csv, or .tsv, choose a model, and run embeddings on the current node or through sbatch. Adjust Slurm partition and --gres in the UI to match your cluster.

What you can do with it

• Compute embeddings with geneformer, scGPT, or scVI
• Load data from a server path instead of uploading large files through the browser
• Download datasets from direct URLs, Zenodo, GEO, or CELLxGENE into .data/
• Convert downloaded .csv and .tsv files into .h5ad inside the repo
• Inspect PCA and UMAP views
• Submit embedding jobs to Slurm with automatic resource recommendations
• Run benchmark-related workflows from the app when your environment supports them

Installation

This project is set up for uv:

uv sync

That creates the environment from pyproject.toml and uv.lock.

Quick start

Launch the app (either form is equivalent for the embeddings UI):

uv run python main.py embeddings

or:

uv run python app/app.py

From there, a typical workflow looks like this:

1. Pick a dataset from the managed .data/ area or paste a server path to a .h5ad, .csv, or .tsv.
2. If you do not already have a dataset handy, use the app's "Download Dataset" section to pull one from a URL, Zenodo, GEO, or CELLxGENE.
3. Choose a model.
4. Run embeddings either on the current node or through Slurm.
5. Explore the outputs in the app, including dimensionality reduction views and saved artifacts.

Downloading model weights

Some models need local weights or checkpoints. You can fetch them with:

uv run python main.py download-weights -- --models geneformer scgpt transcriptformer

You can also call the script directly:

uv run python scripts/download_weights.py --models geneformer scgpt transcriptformer

Available downloads include:

• geneformer (Hugging Face snapshot)
• transcriptformer (official CZI weights from S3 — see models/README.md for variants)
• scgpt (Google Drive folder)
• xtrimo (Hugging Face; may need a token)

Model files are stored under models/ (see models/README.md for TranscriptFormer layout and how it differs from Hugging Face). File contents are gitignored so the clone stays small.

Hugging Face: some downloads (e.g. xtrimo) may need a token. Set HF_TOKEN in the environment or in .env — never commit it.

Useful environment variables if you want to point the app at existing local checkpoints:

• GENEFORMER_MODEL
• TRANSCRIPTFORMER_MODEL
• SCGPT_CKPT_DIR

A fuller list of optional variables (paths, SCFMS_ALLOWED_PATH_PREFIXES, W&B, etc.) is in .env.example.

Working with datasets

The app has a built-in dataset download panel. Downloaded files are organized under:

.data/<dataset-name>/

Inside each dataset folder:

• data/ holds the raw downloaded files
• processed/ holds derived .h5ad files when conversion succeeds

Right now the in-repo conversion step handles .h5ad, .csv, and .tsv inputs. If a download does not convert automatically, the raw files are still preserved in .data/ so you can process them yourself.

Running on Slurm

For larger jobs, you can submit embeddings from the CLI:

uv run python main.py submit-embedding-slurm -- \
  --input-h5ad /path/to/my_dataset.h5ad \
  --model scgpt \
  --matrix-spec X \
  --mem auto \
  --time auto

Or call the helper directly:

uv run python scripts/submit_scfm_embedding_slurm.py \
  --input-h5ad /path/to/my_dataset.h5ad \
  --model scgpt \
  --matrix-spec X \
  --mem auto \
  --time auto

This writes staging files under scfms_job_store/ (override with SCFMS_JOB_DIR) and, unless you override it, saves outputs under scfms_job_store/slurm_embeddings/. The generated batch script is named slurm_gpu_embed.sh; use --partition and --gres that your site supports.

Slurm defaults from .env: set SCFMS_SLURM_PARTITION and optional SCFMS_SLURM_ACCOUNT in .env (see .env.example). The UI and CLI prefill the partition from that variable, and a non-empty account adds #SBATCH -A … to generated scripts. Values you type in the UI or pass with --partition still override the partition default.

If you just want to see what would be submitted:

uv run python scripts/submit_scfm_embedding_slurm.py \
  --input-h5ad /path/to/my_dataset.h5ad \
  --model geneformer \
  --dry-run

Repo layout

• app/: the Gradio application and related UI logic (app/app.py can be run with uv run python app/app.py)
• scripts/: download helpers, embedding utilities, and Slurm helpers
• main.py: a simple CLI entrypoint for the most common commands (e.g. embeddings delegates to app.app)
• .data/: managed dataset workspace created at runtime
• models/: local model weights and checkpoints

Notes

• models/, .data/, logs, and runtime job artifacts are ignored by git
• the CLI entrypoints available today are embeddings, download-weights, and submit-embedding-slurm
• benchmark and W&B-related features are available in the app, but they depend on your local environment being set up for them