remove zeroGPU duration and modify text2image parameters

app.py

@@ -107,7 +107,7 @@ def translate_to_english(text):
 
   return chat_reply.choices[0].message.content
 
-@spaces.GPU(duration=30)
+@spaces.GPU
 def generate_images(history, conversation_times, last_genimg_times, generated_images):
   if generated_images is not None and last_genimg_times == conversation_times:
     return conversation_times, last_genimg_times, *generated_images  # 如果圖片已生成，直接返回
@@ -115,7 +115,7 @@ def generate_images(history, conversation_times, last_genimg_times, generated_im
   user_story = " ".join([h[0] for h in history])
   prompt = translate_to_english(user_story)
 
-  neg_prompt = "dark, realistic, camera, words, sentence, text, Low quality, error, blurry, deformed, extra, nude, duplicate, ugly"
+  neg_prompt = "dark, realistic, words, sentence, text, Low quality, error, extra, nude, duplicate, ugly"
 
   seeds = np.random.randint(0, 100000, 4)
   generator = [torch.Generator().manual_seed(int(i)) for i in seeds]
@@ -123,12 +123,12 @@ def generate_images(history, conversation_times, last_genimg_times, generated_im
   last_genimg_times = conversation_times
 
   for i in range(4):
-    img = pipe_t2i("style of Milton Glaser, mental image, "+prompt,
+    img = pipe_t2i("style of Milton Glaser, healing image, "+prompt,
                 negative_prompt=neg_prompt,
                 height=720, width=512,
                 generator=generator[i],
                 num_inference_steps=40,
-                guidance_scale=7.5,
+                guidance_scale=10,
                 ).images[0]
     images.append(img)