How to use the labelme.utils.newIcon function in labelme

output_file = None
    output_dir = None
    if output is not None:
        if output.endswith('.json'):
            output_file = output
        else:
            output_dir = output

    translator = QtCore.QTranslator()
    translator.load(
        QtCore.QLocale.system().name(),
        osp.dirname(osp.abspath(__file__)) + '/translate'
    )
    app = QtWidgets.QApplication(sys.argv)
    app.setApplicationName(__appname__)
    app.setWindowIcon(newIcon('icon'))
    app.installTranslator(translator)
    win = MainWindow(
        config=config,
        filename=filename,
        output_file=output_file,
        output_dir=output_dir,
    )

    if reset_config:
        logger.info('Resetting Qt config: %s' % win.settings.fileName())
        win.settings.clear()
        sys.exit(0)

    win.show()
    win.raise_()
    sys.exit(app.exec_())

self.edit = LabelQLineEdit()
        self.edit.setPlaceholderText(text)
        self.edit.setValidator(labelme.utils.labelValidator())
        self.edit.editingFinished.connect(self.postProcess)
        if flags:
            self.edit.textChanged.connect(self.updateFlags)
        layout = QtWidgets.QVBoxLayout()
        if show_text_field:
            layout.addWidget(self.edit)
        # buttons
        self.buttonBox = bb = QtWidgets.QDialogButtonBox(
            QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel,
            QtCore.Qt.Horizontal,
            self,
        )
        bb.button(bb.Ok).setIcon(labelme.utils.newIcon('done'))
        bb.button(bb.Cancel).setIcon(labelme.utils.newIcon('undo'))
        bb.accepted.connect(self.validate)
        bb.rejected.connect(self.reject)
        layout.addWidget(bb)
        # label_list
        self.labelList = QtWidgets.QListWidget()
        if self._fit_to_content['row']:
            self.labelList.setHorizontalScrollBarPolicy(
                QtCore.Qt.ScrollBarAlwaysOff
            )
        if self._fit_to_content['column']:
            self.labelList.setVerticalScrollBarPolicy(
                QtCore.Qt.ScrollBarAlwaysOff
            )
        self._sort_labels = sort_labels
        if labels:

def updateFileMenu(self):
        current = self.filename

        def exists(filename):
            return osp.exists(str(filename))

        menu = self.menus.recentFiles
        menu.clear()
        files = [f for f in self.recentFiles if f != current and exists(f)]
        for i, f in enumerate(files):
            icon = utils.newIcon('labels')
            action = QtWidgets.QAction(
                icon, '&%d %s' % (i + 1, QtCore.QFileInfo(f).fileName()), self)
            action.triggered.connect(functools.partial(self.loadRecent, f))
            menu.addAction(action)

self.edit.setPlaceholderText(text)
        self.edit.setValidator(labelme.utils.labelValidator())
        self.edit.editingFinished.connect(self.postProcess)
        if flags:
            self.edit.textChanged.connect(self.updateFlags)
        layout = QtWidgets.QVBoxLayout()
        if show_text_field:
            layout.addWidget(self.edit)
        # buttons
        self.buttonBox = bb = QtWidgets.QDialogButtonBox(
            QtWidgets.QDialogButtonBox.Ok | QtWidgets.QDialogButtonBox.Cancel,
            QtCore.Qt.Horizontal,
            self,
        )
        bb.button(bb.Ok).setIcon(labelme.utils.newIcon('done'))
        bb.button(bb.Cancel).setIcon(labelme.utils.newIcon('undo'))
        bb.accepted.connect(self.validate)
        bb.rejected.connect(self.reject)
        layout.addWidget(bb)
        # label_list
        self.labelList = QtWidgets.QListWidget()
        if self._fit_to_content['row']:
            self.labelList.setHorizontalScrollBarPolicy(
                QtCore.Qt.ScrollBarAlwaysOff
            )
        if self._fit_to_content['column']:
            self.labelList.setVerticalScrollBarPolicy(
                QtCore.Qt.ScrollBarAlwaysOff
            )
        self._sort_labels = sort_labels
        if labels:
            self.labelList.addItems(labels)