def show(label_classes: [str], labelFormatter: LabelFormatterInterface, src: str, des: str, bak: str = None):
"""
Initialize and start app.
:param src: source directory from which images are to be taken; subdirectories included.
:param des: destination directory where labeled images are stored.
:param bak: directory to store images that were left unlabeled. Leaving this option None will add a label to the
image as per the label formatter used.
:param label_classes: A list of class names.
:return:
"""
app = QtWidgets.QApplication(sys.argv)
ui = Ui_MainWindow(label_classes=label_classes,
src=src,
des=des,
bak=bak,
labelFormatter=labelFormatter)
ui.show()
sys.exit(app.exec_())
