exo-explore/exo · error · ValueError

Model must either have a 'model', 'transformer', or 'backbon

Error message

Model must either have a 'model', 'transformer', or 'backbone' attribute

What it means

Error "Model must either have a 'model', 'transformer', or 'backbone' attribute" thrown in exo-explore/exo.

Source

Thrown at src/exo/worker/engines/mlx/auto_parallel.py:228

    inner = getattr(model, "model", None)
    if isinstance(inner, nn.Module):
        return inner

    inner = getattr(model, "transformer", None)
    if isinstance(inner, nn.Module):
        return inner

    inner = getattr(model, "language_model", None)
    if isinstance(inner, nn.Module):
        inner_inner = getattr(inner, "model", None)
        if isinstance(inner_inner, nn.Module):
            return inner_inner

    inner = getattr(model, "backbone", None)
    if isinstance(inner, nn.Module):
        return inner

    raise ValueError(
        "Model must either have a 'model', 'transformer', or 'backbone' attribute"
    )


def get_layers(inner_model_instance: nn.Module) -> list[_LayerCallable]:
    # Handle both model.layers and model.h cases
    layers: list[_LayerCallable]
    if hasattr(inner_model_instance, "layers"):
        layers = cast(list[_LayerCallable], inner_model_instance.layers)
    elif hasattr(inner_model_instance, "h"):
        layers = cast(list[_LayerCallable], inner_model_instance.h)
    else:
        raise ValueError("Model must have either a 'layers' or 'h' attribute")

    return layers


def _patch_hybrid_cache(

View on GitHub (pinned to 21a54c5ea0)

When it happens

Trigger: Thrown at src/exo/worker/engines/mlx/auto_parallel.py:228 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of exo-explore/exo@21a54c5ea0 (2026-08-26). Data as JSON: /api/errors/fda5cdafb40ca948. Report an issue: GitHub.