Record class needs to be defined in a module in distributed mode

[GreatYYX]

This issue is caused by incomplete serialization of Record class defined in __main__.

cloudpipe/cloudpickle#243

[GreatYYX]

Two possible solutions here:

• let upstream provide the feature to pickle interactively defined property type and the instance of the type.
• use another way to indicate if the property should be cached: using a function decorator to update indicators in __dict__ instead of using self-defined type of property.

[GreatYYX]

Upstream provided another solution: override __reduce__ in cached_property:

def __reduce__(self):
    return cached_property.__new__, (cached_property, ), {'func': self.func}