ict[k] = v.fit
        self.fitted_vfuncs = self._apply_func(*args, out_dict=out_dict)
        prev = self.fitted_vfuncs[PREV_KEY][1:]
        if hasattr(self, FILTER_PREV_KEY):
            prev = getattr(self, FILTER_PREV_KEY) + prev
        setattr(self, PREV_KEY, prev)
        self._fitted = True
        return self

    def fit_transform(self, *args):
        &#34;&#34;&#34;Fits to args and transforms only the first arg.&#34;&#34;&#34;
        return self.fit(*args).transform(args[0])

    def transform