move get_deep to utils

src/fairchem/core/common/utils.py

@@ -24,7 +24,7 @@
 from bisect import bisect
 from contextlib import contextmanager
 from dataclasses import dataclass
-from functools import wraps
+from functools import reduce, wraps
 from itertools import product
 from pathlib import Path
 from typing import TYPE_CHECKING, Any
@@ -1488,3 +1488,14 @@ def get_checkpoint_format(config: dict) -> str:
         "dcp",
     ), f"checkpoint format can only be pt or dcp, found {format}"
     return format
+
+
+def get_deep(dictionary: dict, keys: str, default: str | None = None):
+    # given a nested dictionary and a dot separated query, retrieve the item
+    # example:
+    # get_deep(dictionary{"oc20":{"energy",1}}, keys="oc20.energy") -> 1
+    return reduce(
+        lambda d, key: d.get(key, default) if isinstance(d, dict) else default,
+        keys.split("."),
+        dictionary,
+    )