Update app_enhance.py

app_enhance.py

@@ -36,7 +36,7 @@ if not os.path.exists('realesr-general-x4v3.pth'):
 
 model = SRVGGNetCompact(num_in_ch=3, num_out_ch=3, num_feat=64, num_conv=32, upscale=4, act_type='prelu')
 model_path = 'realesr-general-x4v3.pth'
-half = True if torch.cuda.is_available() else False
+half = True if torch.cuda.is_available() else "cpu" 
 upsampler = RealESRGANer(scale=4, model_path=model_path, model=model, tile=0, tile_pad=10, pre_pad=0, half=half)