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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 fit(self, **kwargs):
 """Call the fit method of the primitive. The given keyword arguments will be passed directly to the `fit` method of the primitive instance specified in the JSON annotation. If any of the arguments expected by the produce method had been given during the MLBlock initialization, they will be passed as well. If the fit method was not specified in the JSON annotation, or if the primitive is a simple function, this will be a noop. Args: **kwargs: Any given keyword argument will be directly passed to the primitive fit method. Raises: TypeError: A `TypeError` might be raised if any argument not expected by the primitive fit method is given. """

        if self.fit_method is not None:
            fit_args = self._fit_params.copy()
            fit_args.update(kwargs)
            getattr(self.instance, self.fit_method)(**fit_args)