9;UPPER_THRESHOLD&#39;] = Z[Z.ppv &gt; THR].threshold.values[-1]
            self.veritas_model[&#39;AUC&#39;] = zt.auc()
        return 
    
    def synccols(self, df_):
        &#34;&#34;&#34;
        Synchronize columns between positive and negative cases.

        Parameters:
        df_ (DataFrame): The DataFrame to process.

        Returns:
        DataFrame: A DataFrame with synchronized columns.
        &#34;&#34;&#34;
        df=df_.copy()
        if self.target_label:
            df1 = df[df[sel