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venv/lib/python3.12/site-packages/jax/_src/frozen_dict.py

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+# Copyright 2025 The JAX Authors.
+#
+# 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
+#
+#     https://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.
+
+from typing import Any, TypeVar
+from collections.abc import Iterator, Mapping
+
+K = TypeVar("K")
+V = TypeVar("V")
+
+
+class FrozenDict(Mapping[K, V]):
+
+  def __init__(self, d: Mapping[K, V]):
+    self._d = dict(d.items())
+
+  def __repr__(self) -> str:
+    return f"FrozenDict({self._d!r})"
+
+  def __str__(self) -> str:
+    return f"FrozenDict({self._d})"
+
+  def __getitem__(self, key: K) -> V:
+    return self._d[key]
+
+  def __hash__(self) -> int:
+    # This assumes that the values are hashable.
+    return hash(frozenset(self._d.items()))
+
+  def __eq__(self, other: Any) -> bool:
+    if not isinstance(other, FrozenDict):
+      return False
+    return self._d == other._d
+
+  def __iter__(self) -> Iterator[K]:
+    return iter(self._d)
+
+  def __len__(self) -> int:
+    return len(self._d)
+
+  def get(self, key: K) -> V | None:  # pyrefly: ignore[bad-override]
+    return self._d.get(key, None)