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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_preset(preset):
 """ Initialise a CutOffDictNN according to a preset set of cut-offs. Args: preset (str):
 A preset name. The list of supported presets are: - "vesta_2019": The distance cut-offs used by the VESTA visualisation program. Returns: A CutOffDictNN using the preset cut-off dictionary. """

        if preset == 'vesta_2019':
            cut_offs = loadfn(os.path.join(_directory, 'vesta_cutoffs.yaml'))
            return CutOffDictNN(cut_off_dict=cut_offs)
        else:
            raise ValueError("Unrecognised preset: {}".format(preset))