How to use the ergo.core.saver.Saver function in ergo

def __init__(self, path):
        self.path       = os.path.abspath(path)
        self.train_path = os.path.join(self.path, 'data-train.csv')
        self.test_path  = os.path.join(self.path, 'data-test.csv')
        self.valid_path = os.path.join(self.path, 'data-validation.csv')
        self.saver      = Saver(self)
        self.loader     = Loader(self)
        self.do_save    = True
        self.is_flat    = True
        self.n_labels   = 0
        self.train      = None
        self.test       = None
        self.validation = None
        self.X_train    = None
        self.Y_train    = None
        self.X_test     = None
        self.Y_test     = None
        self.X_val      = None
        self.Y_val      = None
        self.X          = None
        self.Y          = None

def save(self):
        train_path = self.dataset.train_path
        test_path  = self.dataset.test_path
        valid_path = self.dataset.valid_path
        flat = self.dataset.is_flat

        if not self.dataset.is_flat:
            train_path = train_path.replace('.csv', '.pkl')
            test_path = test_path.replace('.csv', '.pkl')
            valid_path = valid_path.replace('.csv', '.pkl')

        self.threads = [ \
          threading.Thread(target=Saver._worker, args=( self.dataset.train, train_path, flat, )),
          threading.Thread(target=Saver._worker, args=( self.dataset.test, test_path, flat, )),
          threading.Thread(target=Saver._worker, args=( self.dataset.validation, valid_path, flat, )) 
        ]

        for t in self.threads:
            t.start()