def fit(self, X, y=None):
        """Fit detector. y is ignored in unsupervised methods.
        Parameters
        ----------
        X : numpy array of shape (n_samples, n_features)
            The input samples.
        y : Ignored
            Not used, present for API consistency by convention.
        Returns
        -------
        self : object
            Fitted estimator.
        """
        X = check_array(X)
        self._set_n_classes(y)
        self.decision_scores_ = self.decision_function(X)
        self.X_train = X
        self._process_decision_scores()
        return self
Fit detector. y is ignored in unsupervised methods.
        Parameters
        ----------
        X : numpy array of shape (n_samples, n_features)
            The input samples.
        y : Ignored
            Not used, present for API consistency by convention.
        Returns
        -------
        self : object
            Fitted estimator.
        
pyod/models/copod.py