<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fit(self, data):
 """ Fit a transformer using the SFrame `data`. Parameters data : SFrame The data used to fit the transformer. Returns ------- self (A fitted version of the object) See Also -------- transform, fit_transform Examples -------- .. sourcecode:: python {examples} """


        _raise_error_if_not_sframe(data, "data")
        self.__proxy__.fit(data)
        return self