Add checkpoint utility.

iris/checkpoint_util.py

@@ -0,0 +1,29 @@
+# Copyright 2024 Google LLC.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Utilities for interacting with BBv2 checkpoints."""
+
+import pickle as pkl
+from typing import Any
+
+from absl import logging
+
+
+def load_checkpoint_state_oss(path: str) -> dict[str, Any]:
+  """Loads a checkpoint state from a given path."""
+  with open(path, "rb") as f:
+    state = pkl.load(f)
+  return state
+
+load_checkpoint_state = load_checkpoint_state_oss