Add missing license headers to AlphaZero source files.

PiperOrigin-RevId: 871750648
Change-Id: Ieb9fe704c6cc6fbe6297f867d52ee3b6d634d020

Author: lanctot

open_spiel/python/algorithms/alpha_zero/model_linen.py

@@ -1,3 +1,17 @@
+# Copyright 2019 DeepMind Technologies Limited
+#
+# 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.
+
 """An AlphaZero model with a policy and value heads using flax.linen."""
 
 import functools

open_spiel/python/algorithms/alpha_zero/model_nnx.py

@@ -1,3 +1,17 @@
+# Copyright 2019 DeepMind Technologies Limited
+#
+# 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.
+
 """A model based on nnx."""
 
 import os

open_spiel/python/algorithms/alpha_zero/replay_buffer.py

@@ -1,3 +1,17 @@
+# Copyright 2019 DeepMind Technologies Limited
+#
+# 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.
+
 """A replay buffer for AlphaZero."""
 
 from typing import Generic, TypeVar

open_spiel/python/algorithms/alpha_zero/utils.py

@@ -1,3 +1,17 @@
+# Copyright 2019 DeepMind Technologies Limited
+#
+# 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.
+
 """Common utilities for AlphaZero."""
 
 from typing import Any, Callable