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					@ -411,7 +411,7 @@ class Generator (Learner):
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					                        _df[name] = _dates
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					                        _df[name] = _dates
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					            _schema = self.get_schema()
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					            _schema = self.get_schema()
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					            _schema = [{'name':_item.name,'type':_item.field_type} for _item in _schema]
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					            _schema = [{'name':_item.name,'type':_item.field_type} for _item in _schema]
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					            writer.write(_df[['birth_datetime']+self.columns],schema=_schema)
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					            writer.write(_df[self.columns],schema=_schema)
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					        pass
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					        pass
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					class factory :
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					class factory :
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					    _infocache = {}
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					    _infocache = {}
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