sgl-project/sglang · error · ValueError

Hugging Face weight URL has no model repo: {source!r}

Error message

Hugging Face weight URL has no model repo: {source!r}

What it means

Raised by _parse_huggingface_url when a huggingface.co URL has fewer than two non-empty path segments, so no owner/repo model id can be extracted (e.g. https://huggingface.co/ or .../org only).

Source

Thrown at python/sglang/multimodal_gen/runtime/weights/source.py:80

            f"Weight URL pins revision {url_revision!r}, which conflicts with "
            f"revision {revision!r}"
        )
    return url_revision or revision


def _parse_huggingface_url(source: str, revision: str | None) -> WeightSource:
    parsed = urlparse(source)
    if parsed.netloc.lower() not in ("huggingface.co", "www.huggingface.co"):
        raise ValueError(
            "Only huggingface.co weight URLs are supported; use a local path "
            "or an owner/repo reference for other sources"
        )

    raw_parts = [part for part in parsed.path.split("/") if part]
    if raw_parts and raw_parts[0] in ("datasets", "spaces"):
        raise ValueError("Diffusion weights must come from a Hugging Face model repo")
    if len(raw_parts) < 2:
        raise ValueError(f"Hugging Face weight URL has no model repo: {source!r}")

    repo_id = "/".join(unquote(part) for part in raw_parts[:2])
    validate_repo_id(repo_id)
    action = raw_parts[2] if len(raw_parts) > 2 else None
    if action is None:
        return WeightSource(
            original=source,
            kind="huggingface",
            repo_id=repo_id,
            revision=revision,
        )
    if action not in ("tree", "blob", "resolve") or len(raw_parts) < 4:
        raise ValueError(f"Unsupported Hugging Face weight URL: {source!r}")

    url_revision = unquote(raw_parts[3])
    selected_revision = _merge_revision(url_revision, revision)
    tail = "/".join(unquote(part) for part in raw_parts[4:])
    if action == "tree":

View on GitHub (pinned to 0132848349)

Solutions

1. Use a complete URL with both owner and repo: https://huggingface.co/owner/repo
2. Or use the shorthand 'owner/repo' form
3. Validate the URL has at least two path segments before passing it

Example fix

# before
parse_weight_source("https://huggingface.co/stability")
# after
parse_weight_source("https://huggingface.co/stabilityai/stable-diffusion-xl")

parts = [p for p in urlparse(url).path.split("/") if p]
if urlparse(url).netloc and len(parts) < 2:
    raise ValueError(f"URL lacks owner/repo: {url}")

def url_has_repo_id(url: str) -> bool:
    if "://" not in url:
        return "/" in url.strip("/")  # owner/repo form
    return len([p for p in urlparse(url).path.split("/") if p]) >= 2

When it happens

Trigger: Calling parse_weight_source with 'https://huggingface.co' or 'https://huggingface.co/org'.

Common situations: Truncated copy-pasted URLs, typos dropping the repo name, or string interpolation that leaves the repo segment empty.

Related errors

• Invalid Hugging Face {field_name}: {path!r}
• Weight URL pins revision {url_revision!r}, which conflicts w
• Only huggingface.co weight URLs are supported; use a local p
• Diffusion weights must come from a Hugging Face model repo
• Unsupported Hugging Face weight URL: {source!r}

AI-assisted analysis of sgl-project/sglang@0132848349 (2026-08-28). Data as JSON: /api/errors/c60b41558dd93361. Report an issue: GitHub.