def train(self, save=False, save_dir=None):
    train_img_list = glob.glob(self.path_train + "/*")
    print(train_img_list)

    train_features = []

    for img_file in train_img_list:
        img = io.imread(img_file)
        img = color.rgb2lab(img)
        img_features = self.extract_texton_feature(img, self.fb, self.nb_features)
        train_features.extend(img_features)

    train_features = np.array(train_features)
    print(train_features.shape)

    kmeans_cluster = MiniBatchKMeans(n_clusters=self.nb_clusters, verbose=1, max_iter=300)
    kmeans_cluster.fit(train_features)
    print(kmeans_cluster.cluster_centers_)
    print(kmeans_cluster.cluster_centers_.shape)

    self.cluster = kmeans_cluster

    # save kmeans result
    if save is True:
        with open(save_dir, 'wb') as f:
            pickle.dump(self.cluster, f)

    def save(self, event):
        if not self.filename:
            self.save_as(event)
        else:
            if self.writefile(self.filename):
                self.set_saved(True)
                try:
                    self.editwin.store_file_breaks()
                except AttributeError:  # may be a PyShell
                    pass
        self.text.focus_set()
        return "break"