added torch check for GPU

app.py

@@ -1,4 +1,5 @@
 import os
+import torch
 import gradio as gr
 from video_watermark_remover import *
 from video_converter import *
@@ -19,7 +20,7 @@ class FakeLamaArgs(BaseModel):
     sd_enable_xformers: bool = False
     local_files_only: bool = False
     cpu_offload: bool = False
-    device: str = "cuda"
+    device: str = "cuda" if torch.cuda.is_available() else "cpu"
     gui: bool = False
     gui_size: List[int] = [1000, 1000]
     input: str = ''
@@ -27,7 +28,7 @@ class FakeLamaArgs(BaseModel):
     debug: bool = False
     no_half: bool = False
     disable_nsfw: bool = False
-    enable_xformers: bool = True
+    enable_xformers: bool = True if torch.cuda.is_available() else False
     model_dir: str = None
     output_dir: str = None