def initUI(self):
        self.font = QFont('Calibri')
        self.setFont(self.font)
        self.setGeometry(50, 50, 270, 256)
        self.setWindowTitle("DQN")

        # When showSignal's state is changed, update gif
        global showSignal
        showSignal = QCheckBox('', self)
        showSignal.setHidden(True)
        showSignal.stateChanged.connect(self.showGif)

        self.movie = QLabel()  # Gif
        self.label = QLabel()  # Label

        self.layoutMain = QGridLayout()
        self.layoutMain.addWidget(self.movie, 0, 0)
        self.layoutMain.addWidget(self.label, 1, 0)
        self.layoutMain.setRowStretch(0, 12)
        self.setLayout(self.layoutMain)