def gen_captcha(text):
image = ImageCaptcha(width=width, height=height, fonts=fonts[2:3])
data = image.generate(text)
image = Image.open(data)
image = torch.ByteTensor(torch.ByteStorage.from_buffer(image.tobytes()))
image = image.view(height, width, 3)
image = image.float()
image.div_(255)
return image
