Send evaluator logs to new session (#7206)

Also stop specifying "eval" mode since explicit project modes are
deprecated

langchain/callbacks/tracers/evaluation.py

@@ -6,6 +6,7 @@ from uuid import UUID
 
 from langchainplus_sdk import LangChainPlusClient, RunEvaluator
 
+from langchain.callbacks.manager import tracing_v2_enabled
 from langchain.callbacks.tracers.base import BaseTracer
 from langchain.callbacks.tracers.schemas import Run
 
@@ -27,6 +28,8 @@ class EvaluatorCallbackHandler(BaseTracer):
         If not specified, a new instance will be created.
     example_id : Union[UUID, str], optional
         The example ID to be associated with the runs.
+    project_name : str, optional
+        The LangSmith project name to be organize eval chain runs under.
 
     Attributes
     ----------
@@ -40,6 +43,8 @@ class EvaluatorCallbackHandler(BaseTracer):
         The thread pool executor used for running the evaluators.
     futures : Set[Future]
         The set of futures representing the running evaluators.
+    project_name : Optional[str]
+        The LangSmith project name to be organize eval chain runs under.
     """
 
     name = "evaluator_callback_handler"
@@ -50,6 +55,7 @@ class EvaluatorCallbackHandler(BaseTracer):
         max_workers: Optional[int] = None,
         client: Optional[LangChainPlusClient] = None,
         example_id: Optional[Union[UUID, str]] = None,
+        project_name: Optional[str] = None,
         **kwargs: Any,
     ) -> None:
         super().__init__(**kwargs)
@@ -62,10 +68,24 @@ class EvaluatorCallbackHandler(BaseTracer):
             max_workers=max(max_workers or len(evaluators), 1)
         )
         self.futures: Set[Future] = set()
+        self.project_name = project_name
 
-    def _evaluate_run(self, run: Run, evaluator: RunEvaluator) -> None:
+    def _evaluate_in_project(self, run: Run, evaluator: RunEvaluator) -> None:
+        """Evaluate the run in the project.
+
+        Parameters
+        ----------
+        run : Run
+            The run to be evaluated.
+        evaluator : RunEvaluator
+            The evaluator to use for evaluating the run.
+
+        """
         try:
-            self.client.evaluate_run(run, evaluator)
+            if self.project_name is None:
+                self.client.evaluate_run(run, evaluator)
+            with tracing_v2_enabled(project_name=self.project_name):
+                self.client.evaluate_run(run, evaluator)
         except Exception as e:
             logger.error(
                 f"Error evaluating run {run.id} with "
@@ -86,7 +106,9 @@ class EvaluatorCallbackHandler(BaseTracer):
         run_ = run.copy()
         run_.reference_example_id = self.example_id
         for evaluator in self.evaluators:
-            self.futures.add(self.executor.submit(self._evaluate_run, run_, evaluator))
+            self.futures.add(
+                self.executor.submit(self._evaluate_in_project, run_, evaluator)
+            )
 
     def wait_for_futures(self) -> None:
         """Wait for all futures to complete."""

langchain/client/runner_utils.py

@@ -313,28 +313,35 @@ async def _callbacks_initializer(
     project_name: Optional[str],
     client: LangChainPlusClient,
     run_evaluators: Sequence[RunEvaluator],
+    evaluation_handler_collector: List[EvaluatorCallbackHandler],
 ) -> List[BaseTracer]:
     """
     Initialize a tracer to share across tasks.
 
     Args:
         project_name: The project name for the tracer.
+        client: The client to use for the tracer.
+        run_evaluators: The evaluators to run.
+        evaluation_handler_collector: A list to collect the evaluators.
+            Used to wait for the evaluators to finish.
 
     Returns:
-        A LangChainTracer instance with an active project.
+        The callbacks for this thread.
     """
     callbacks: List[BaseTracer] = []
     if project_name:
         callbacks.append(LangChainTracer(project_name=project_name))
+    evaluator_project_name = f"{project_name}-evaluators" if project_name else None
     if run_evaluators:
-        callbacks.append(
-            EvaluatorCallbackHandler(
-                client=client,
-                evaluators=run_evaluators,
-                # We already have concurrency, don't want to overload the machine
-                max_workers=1,
-            )
+        callback = EvaluatorCallbackHandler(
+            client=client,
+            evaluators=run_evaluators,
+            # We already have concurrency, don't want to overload the machine
+            max_workers=1,
+            project_name=evaluator_project_name,
         )
+        callbacks.append(callback)
+        evaluation_handler_collector.append(callback)
     return callbacks
 
 
@@ -382,12 +389,9 @@ async def arun_on_examples(
     """
     project_name = _get_project_name(project_name, llm_or_chain_factory, None)
     client_ = client or LangChainPlusClient()
-    client_.create_project(project_name, mode="eval")
+    client_.create_project(project_name)
 
     results: Dict[str, List[Any]] = {}
-    evaluation_handler = EvaluatorCallbackHandler(
-        evaluators=run_evaluators or [], client=client_
-    )
 
     async def process_example(
         example: Example, callbacks: List[BaseCallbackHandler], job_state: dict
@@ -410,17 +414,20 @@ async def arun_on_examples(
                 flush=True,
             )
 
+    evaluation_handlers: List[EvaluatorCallbackHandler] = []
     await _gather_with_concurrency(
         concurrency_level,
         functools.partial(
             _callbacks_initializer,
             project_name=project_name,
             client=client_,
+            evaluation_handler_collector=evaluation_handlers,
             run_evaluators=run_evaluators or [],
         ),
         *(functools.partial(process_example, e) for e in examples),
     )
-    evaluation_handler.wait_for_futures()
+    for handler in evaluation_handlers:
+        handler.wait_for_futures()
     return results
 
 
@@ -581,10 +588,13 @@ def run_on_examples(
     results: Dict[str, Any] = {}
     project_name = _get_project_name(project_name, llm_or_chain_factory, None)
     client_ = client or LangChainPlusClient()
-    client_.create_project(project_name, mode="eval")
+    client_.create_project(project_name)
     tracer = LangChainTracer(project_name=project_name)
+    evaluator_project_name = f"{project_name}-evaluators"
     evalution_handler = EvaluatorCallbackHandler(
-        evaluators=run_evaluators or [], client=client_
+        evaluators=run_evaluators or [],
+        client=client_,
+        project_name=evaluator_project_name,
     )
     callbacks: List[BaseCallbackHandler] = [tracer, evalution_handler]
     for i, example in enumerate(examples):