Fix function

great_ai/tracing/add_ground_truth.py

@@ -1,7 +1,8 @@
 from datetime import datetime
 from math import ceil
 from random import shuffle
-from typing import Any, Iterable, List, TypeVar
+from typing import Any, Iterable, List, TypeVar, cast
+from uuid import uuid4
 
 from ..constants import (
     GROUND_TRUTH_TAG_NAME,
@@ -51,7 +52,10 @@ def add_ground_truth(
 
     created = datetime.utcnow().isoformat()
     traces = [
-        Trace[T](
+        cast(
+            Trace[T],
+            Trace(  # avoid ValueError: "Trace" object has no field "__orig_class__"
+                trace_id=str(uuid4()),
                 created=created,
                 original_execution_time_ms=0,
                 logged_values=X if isinstance(X, dict) else {"input": X},
@@ -60,6 +64,7 @@ def add_ground_truth(
                 feedback=y,
                 exception=None,
                 tags=[GROUND_TRUTH_TAG_NAME, split_tag, *tags],
+            ),
         )
         for ((X, y), split_tag) in zip(values, split_tags)
     ]