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name: scgpt description: > Embed and annotate single-cell expression data with scGPT, a foundation model for single-cell biology. Use this skill when: (1) Producing cell embeddings from an AnnData for clustering/integration, (2) Zero-shot or fine-tuned cell-type annotation, (3) Gene-level representation for perturbation/GRN tasks.

For probabilistic single-cell models (scVI etc.), use the scvi-tools library. license: Apache-2.0 category: biomodels requirements: [gpu] metadata: display-name: scGPT

scGPT checkpoints are distributed as unlabeled Google Drive directories

(linked from github.com/bowang-lab/scGPT); the repo LICENSE (MIT) covers

the CODE, and no source states a weights license. Per the sourcing rule:

leave license absent. Repo root is a README, not a terms page —

info_url. verified 2026-06-30

third_party: - kind: weights name: scGPT provider: Wang Lab (University of Toronto) info_url: https://github.com/bowang-lab/scGPT

scGPT — Single-Cell Foundation Model

Prerequisites

Requirement	Minimum	Recommended
Python	3.10+	3.11
CUDA	12.1+	12.4+
GPU VRAM	16 GB	24 GB+

How to run

Loading the vocabulary and checkpoint

scGPT checkpoints are raw directories (args.json, best_model.pt, vocab.json) — not Hugging Face hub repos. Point at the directory, not an HF repo id.

from scgpt.tokenizer.gene_tokenizer import GeneVocab
gv = GeneVocab.from_file("/path/to/scgpt-human/vocab.json")
print(len(gv))   # 60697 for the released human checkpoint

Embedding an AnnData

import anndata as ad
from scgpt.tasks import embed_data

adata = ad.read_h5ad("dataset.h5ad")        # var must contain a gene-name column
emb = embed_data(
    adata,
    model_dir="/path/to/scgpt-human",
    gene_col="feature_name",
    use_fast_transformer=False,             # see Gotchas
)
# emb is an AnnData with .obsm["X_scGPT"]

Output format

embed_data returns an AnnData whose .obsm["X_scGPT"] is the per-cell embedding (n_cells × emb_dim, 512 by default). Downstream: feed to scanpy.pp.neighbors / scanpy.tl.umap.

Remote compute

Needs ≥24 GB VRAM and the released human checkpoint (~200 MB: args.json, best_model.pt, vocab.json). Read compute_details({provider, mode:'read'}) for an environment with scgpt and a pre-cached checkpoint directory, then:

c = host.compute.create(provider)
job = c.submitJob(
    intent="scGPT embed 50k cells — 1×GPU, ~5 min",
    inputs=[
        {"src": "dataset.h5ad", "dstFilename": "dataset.h5ad"},
        {"src": "embed.py", "dstFilename": "embed.py"},
    ],
    command="python3 embed.py",
    environment=...,   # env name from compute_details
    outputs=["embedded.h5ad"],
    timeoutSeconds=1800,
)
print(job.job_id)   # cell ends here — kernel never blocks on compute

Retain the exact returned job_id. Query that saved ID with the non-blocking host.compute.create(provider).attachJob(job_id).status() or .result() when its state or result is relevant; do not scan Job history. A final .result() read reports whether its follow-up was suppressed or had already been committed; otherwise the app starts the later analysis turn for an unread final result. See the remote-compute-ssh skill for the orchestration details.

See the remote-compute-ssh / remote-compute-modal skill for the orchestration details.

In embed.py, pass model_dir= the checkpoint path from compute_details. If flash-attn is unavailable in that environment, set use_fast_transformer=False.

Gotchas

• use_fast_transformer default is True but resolves to a FlashAttention path that may not import in every env. Pass use_fast_transformer=False unless you've confirmed flash_attn loads cleanly.
• The package historically depended on torchtext.vocab.Vocab; in environments without torchtext a pure-Python shim provides Vocab — functionally identical for GeneVocab, but if you hit AttributeError: 'Vocab' object has no attribute …, you're on a stale shim.
• Gene names must match the vocab; unmatched genes are dropped. Set gene_col to the column in adata.var that holds symbols.

Troubleshooting

Symptom	Fix
flash_attn is not installed warning at import	Harmless; pass use_fast_transformer=False
'Vocab' object has no attribute 'vocab'	Env has an old torchtext shim — update the env
Nearly all genes dropped	Wrong gene_col; check adata.var.columns
"scgpt not in manifest" / env-detection misses scGPT	The baked env manifest lists the distribution as scGPT (and flash_attn), pip's canonical casing — normalize manifest keys before lookup: name.lower().replace('-', '_')

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Next: cluster/annotate the embedding with the scanpy library (sc.pp.neighbors → sc.tl.leiden / sc.tl.umap), or compare to an scvi-tools latent space on the same data.