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``--robot.cameras`` parses the JSON into ``dict[str, dict]``, but ``RobotConfig`` expects ``dict[str, CameraConfig]`` — each inner value must be the actual ``CameraConfig`` subclass instance for the chosen backend (e.g. ``OpenCVCameraConfig``). Passing raw dicts blew up in ``RobotConfig.__post_init__`` with ``AttributeError: 'dict' object has no attribute 'width'`` when it iterated cameras and tried to read attributes. Look up the right subclass per-camera by its ``"type"`` field via ``CameraConfig.get_choice_class(...)`` (mirroring the lazy-import dance we already do for ``RobotConfig``: eagerly walk ``lerobot.cameras``'s submodules so the registry is populated before lookup). Construct an instance with the rest of the dict's fields. On an unknown camera type, raise a clean ``ValueError`` listing the available choices. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>