def _uncache(self, cpath, node, ureg):
        '''
        calc._uncache(cpath, uret) is an internally called function that handles loading of cached
          data from disk given the afferent parameters.
        '''
        # load the results, one at a time; all errors can just be allowed to raise upward since
        # this is always called from in a try block (in __call__)
        result = {}
        for eff in node.efferents:
            result[eff] = load(os.path.join(cpath, eff) + '.pp', ureg=ureg)
        return result
calc._uncache(cpath, uret) is an internally called function that handles loading of cached
          data from disk given the afferent parameters.