Reuse jinja environment for a prompt

outlines/prompts.py

@@ -24,6 +24,7 @@ class Prompt:
 
     def __post_init__(self):
         self.parameters: List[str] = list(self.signature.parameters.keys())
+        self.jinja_environment = create_jinja_template(self.template)
 
     def __call__(self, *args, **kwargs) -> str:
         """Render and return the template.
@@ -35,7 +36,7 @@ def __call__(self, *args, **kwargs) -> str:
         """
         bound_arguments = self.signature.bind(*args, **kwargs)
         bound_arguments.apply_defaults()
-        return render(self.template, **bound_arguments.arguments)
+        return self.jinja_environment.render(**bound_arguments.arguments)
 
     def __str__(self):
         return self.template
@@ -182,6 +183,11 @@ def render(template: str, **values: Optional[Dict[str, Any]]) -> str:
     A string that contains the rendered template.
 
     """
+    jinja_template = create_jinja_template(template)
+    return jinja_template.render(**values)
+
+
+def create_jinja_template(template: str):
     # Dedent, and remove extra linebreak
     cleaned_template = inspect.cleandoc(template)
 
@@ -210,8 +216,7 @@ def render(template: str, **values: Optional[Dict[str, Any]]) -> str:
     env.filters["args"] = get_fn_args
 
     jinja_template = env.from_string(cleaned_template)
-
-    return jinja_template.render(**values)
+    return jinja_template
 
 
 def get_fn_name(fn: Callable):