make it possible to use fractional values for SD upscale.

    def do_upscale(self, img: PIL.Image, selected_model: str):

        return img

    def upscale(self, img: PIL.Image, scale: int, selected_model: str = None):

    def upscale(self, img: PIL.Image, scale, selected_model: str = None):

        self.scale = scale

        dest_w = img.width * scale

        dest_h = img.height * scale

        dest_w = int(img.width * scale)

        dest_h = int(img.height * scale)

        for i in range(3):

            shape = (img.width, img.height)

    def ui(self, is_img2img):

        info = gr.HTML("<p style=\"margin-bottom:0.75em\">Will upscale the image by the selected scale factor; use width and height sliders to set tile size</p>")

        overlap = gr.Slider(minimum=0, maximum=256, step=16, label='Tile overlap', value=64)

        scale_factor = gr.Slider(minimum=1, maximum=4, step=1, label='Scale Factor', value=2)

        scale_factor = gr.Slider(minimum=1.0, maximum=4.0, step=0.05, label='Scale Factor', value=2.0)

        upscaler_index = gr.Radio(label='Upscaler', choices=[x.name for x in shared.sd_upscalers], value=shared.sd_upscalers[0].name, type="index")

        return [info, overlap, upscaler_index, scale_factor]