exo-explore/exo · error · ValueError

No vision weights found with prefixes {vision_prefixes} in {

Error message

No vision weights found with prefixes {vision_prefixes} in {self._model_path}. Ensure the model repo contains bundled vision weights.

What it means

Error "No vision weights found with prefixes {vision_prefixes} in {self._model_path}. Ensure the model repo contains bundled vision weights." thrown in exo-explore/exo.

Source

Thrown at src/exo/worker/engines/mlx/vision.py:459

                        if key.startswith(prefix):
                            vision_weights[key[len(prefix) :]] = _torch_tensor_to_mx(
                                f.get_tensor(key)
                            )
                            if prefix == "model.visual.":
                                needs_sanitize = True
                            matched = True
                            break
                    if matched:
                        continue
                    for prefix in projector_prefixes:
                        if key.startswith(prefix):
                            projector_weights[key[len(prefix) :]] = _torch_tensor_to_mx(
                                f.get_tensor(key)
                            )
                            break

        if not vision_weights:
            raise ValueError(
                f"No vision weights found with prefixes {vision_prefixes} in {self._model_path}. "
                "Ensure the model repo contains bundled vision weights."
            )

        assert self._vision_tower is not None
        if needs_sanitize:
            sanitize: Callable[[dict[str, mx.array]], dict[str, mx.array]] | None = (
                getattr(self._vision_tower, "sanitize", None)
            )
            if sanitize is not None:
                vision_weights = sanitize(vision_weights)

        self._vision_tower.load_weights(list(vision_weights.items()))
        mx.eval(self._vision_tower.parameters())

        if self._projector is not None and projector_weights:
            self._apply_projector_quantization_if_needed(projector_weights)
            self._projector.load_weights(list(projector_weights.items()))

View on GitHub (pinned to 21a54c5ea0)

When it happens

Trigger: Thrown at src/exo/worker/engines/mlx/vision.py:459 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/09a104d71cecd3b1. Report an issue: GitHub.