Clean up call API (#3)

- Clean up call API (5bca34d3a99cc6fb4fff28fb6918947de4565de6)

text_to_image.py

@@ -43,9 +43,12 @@ class TextToImageTool(Tool):
 
         self.is_initialized = True
 
-    def __call__(self, prompt, negative_prompt="low quality, bad quality, deformed, low resolution", added_prompt=" , highest quality, highly realistic, very high resolution"):
+    def __call__(self, prompt):
         if not self.is_initialized:
             self.setup()
 
-        return self.pipeline(prompt + added_prompt, num_inference_steps=25).images[0]
+        negative_prompt = "low quality, bad quality, deformed, low resolution"
+        added_prompt = " , highest quality, highly realistic, very high resolution"
+
+        return self.pipeline(prompt + added_prompt, negative_prompt=negative_prompt, num_inference_steps=25).images[0]