Create an empty `ImageDataBunch` in `path` with `classes`. Typically used for inference.

def single_from_classes(path:Union[Path, str], classes:Collection[str], ds_tfms:TfmList=None, **kwargs):
        "Create an empty `ImageDataBunch` in `path` with `classes`. Typically used for inference."
        warn("""This method is deprecated and will be removed in a future version, use `load_learner` after
             `Learner.export()`""", DeprecationWarning)
        sd = ImageList([], path=path, ignore_empty=True).split_none()
        return sd.label_const(0, label_cls=CategoryList, classes=classes).transform(ds_tfms, **kwargs).databunch()