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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 collapse(cls, holomap, ranges=None, mode='data'):
 """ Given a map of Overlays, apply all applicable compositors. """

        # No potential compositors
        if cls.definitions == []:
            return holomap

        # Apply compositors
        clone = holomap.clone(shared_data=False)
        data = zip(ranges[1], holomap.data.values()) if ranges else holomap.data.items()
        for key, overlay in data:
            clone[key] = cls.collapse_element(overlay, ranges, mode)
        return clone