Update custom_st.py

custom_st.py

@@ -69,7 +69,7 @@ class MultiModalTransformer(BaseTransformer):
                     raise ValueError(f"Unknown image type {type(img)}")
             if "text" in item:
                 if text:
-                    text += "<|begin_of_text|> "
+                    text += "<|begin_of_text|>"
                 text += item["text"].lstrip()
             
             return text, img