Merge pull request #1213 from google-deepmind:lanctot_v1.5_warnings

PiperOrigin-RevId: 628371699
Change-Id: I21610382038c80ff498368ec650aba0d23dc85a5

open_spiel/python/algorithms/alpha_zero/model.py

@@ -18,11 +18,19 @@
 import functools
 import os
 from typing import Sequence
+import warnings
 
 import numpy as np
 import tensorflow.compat.v1 as tf
 
 
+warnings.warn(
+    "Python AlphaZero has known issues when using Keras 3 and may be "
+    "removed in a future version unless fixed. See OpenSpiel github "
+    "issue #1206 for details."
+)
+
+
 def cascade(x, fns):
   for fn in fns:
     x = fn(x)

open_spiel/python/algorithms/deep_cfr_tf2.py

@@ -32,13 +32,22 @@
 import contextlib
 import os
 import random
+import warnings
+
 import numpy as np
 import tensorflow as tf
 
 from open_spiel.python import policy
 import pyspiel
 
 
+warnings.warn(
+    'Deep CFR TF2 has known issues when using Keras 3 and may be removed '
+    'in a future version unless fixed. See OpenSpiel github issue #1208 '
+    'for details.'
+)
+
+
 # The size of the shuffle buffer used to reshuffle part of the data each
 # epoch within one training iteration
 ADVANTAGE_TRAIN_SHUFFLE_SIZE = 100000

open_spiel/python/algorithms/rcfr.py

@@ -37,13 +37,23 @@
     At Advances in Neural Information Processing Systems 20 (NeurIPS). 2007.
 """
 
+import warnings
+
 import numpy as np
 import tensorflow.compat.v1 as tf
 
+
 # Temporarily disable TF2 behavior while the code is not updated.
 tf.disable_v2_behavior()
 
 
+warnings.warn(
+    "RCFR has known issues when using Keras 3 and may be removed in a "
+    "future version unless fixed. See OpenSpiel github issue #1207 for "
+    "details."
+)
+
+
 def tensor_to_matrix(tensor):
   """Converts `tensor` to a matrix (a rank-2 tensor) or raises an exception.