fix: score for jupyter (#1411)

src/ragas/metrics/base.py

@@ -58,7 +58,8 @@ class Metric(ABC):
 
     @property
     @abstractmethod
-    def name(self) -> str: ...
+    def name(self) -> str:
+        ...
 
     @property
     def required_columns(self) -> t.Dict[str, t.Set[str]]:
@@ -145,7 +146,8 @@ async def ascore(
         return score
 
     @abstractmethod
-    async def _ascore(self, row: t.Dict, callbacks: Callbacks) -> float: ...
+    async def _ascore(self, row: t.Dict, callbacks: Callbacks) -> float:
+        ...
 
 
 @dataclass
@@ -193,6 +195,15 @@ def single_turn_score(
             self.name, inputs=sample.model_dump(), callbacks=callbacks
         )
         try:
+            if is_event_loop_running():
+                try:
+                    import nest_asyncio
+
+                    nest_asyncio.apply()
+                except ImportError:
+                    raise ImportError(
+                        "It seems like your running this in a jupyter-like environment. Please install nest_asyncio with `pip install nest_asyncio` to make it work."
+                    )
             loop = asyncio.get_event_loop()
             score = loop.run_until_complete(
                 self._single_turn_ascore(sample=sample, callbacks=group_cm)
@@ -234,7 +245,8 @@ async def _single_turn_ascore(
         self,
         sample: SingleTurnSample,
         callbacks: Callbacks,
-    ) -> float: ...
+    ) -> float:
+        ...
 
 
 class MultiTurnMetric(Metric):
@@ -248,6 +260,15 @@ def multi_turn_score(
             self.name, inputs=sample.model_dump(), callbacks=callbacks
         )
         try:
+            if is_event_loop_running():
+                try:
+                    import nest_asyncio
+
+                    nest_asyncio.apply()
+                except ImportError:
+                    raise ImportError(
+                        "It seems like your running this in a jupyter-like environment. Please install nest_asyncio with `pip install nest_asyncio` to make it work."
+                    )
             loop = asyncio.get_event_loop()
             score = loop.run_until_complete(
                 self._multi_turn_ascore(sample=sample, callbacks=group_cm)
@@ -290,7 +311,8 @@ async def _multi_turn_ascore(
         self,
         sample: MultiTurnSample,
         callbacks: Callbacks,
-    ) -> float: ...
+    ) -> float:
+        ...
 
 
 class Ensember: