chore: import upstream snapshot with attribution

python/ray/train/xgboost/__init__.py

@@ -0,0 +1,19 @@
+from ray.train.v2._internal.constants import is_v2_enabled
+from ray.train.xgboost._xgboost_utils import RayTrainReportCallback
+from ray.train.xgboost.config import XGBoostConfig
+from ray.train.xgboost.xgboost_checkpoint import XGBoostCheckpoint
+from ray.train.xgboost.xgboost_trainer import XGBoostTrainer
+
+if is_v2_enabled():
+    from ray.train.v2.xgboost.config import XGBoostConfig  # noqa: F811
+    from ray.train.v2.xgboost.xgboost_trainer import XGBoostTrainer  # noqa: F811
+
+__all__ = [
+    "RayTrainReportCallback",
+    "XGBoostCheckpoint",
+    "XGBoostConfig",
+    "XGBoostTrainer",
+]
+
+
+# DO NOT ADD ANYTHING AFTER THIS LINE.