Change link to LibTorch and add docs to workaround for known issue.

PiperOrigin-RevId: 500696638 Change-Id: I4d5d2f76efc0f927060bd493bdd106b20a5cf7d9
google-deepmind · Jan 9, 2023 · e75bdf1 · e75bdf1
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diff --git a/open_spiel/algorithms/alpha_zero_torch/README.md b/open_spiel/algorithms/alpha_zero_torch/README.md
@@ -7,6 +7,10 @@ To build and use this implementation, you must set the optional global variables
 `OPEN_SPIEL_BUILD_WITH_LIBTORCH` and `OPEN_SPIEL_BUILD_WITH_LIBNOP` to `ON` when
 installing dependencies and building OpenSpiel.
 
+**Note**: Note: there are currently known problems with the C++ PyTorch:
+inteferences with pybind11 versions. Until it is properly fixed, please see
+[the workaround described here](https://github.com/deepmind/open_spiel/issues/966#issuecomment-1322982393).
+
 Then, to get started, see `examples/alpha_zero_torch_example.cc`.
 
 Important note: this implementation was a user contribution (see

diff --git a/open_spiel/scripts/global_variables.sh b/open_spiel/scripts/global_variables.sh
@@ -83,8 +83,12 @@ export OPEN_SPIEL_BUILD_WITH_LIBTORCH="${OPEN_SPIEL_BUILD_WITH_LIBTORCH:-"OFF"}"
 # CUDA 10.2  https://download.pytorch.org/libtorch/cu102/libtorch-cxx11-abi-shared-with-deps-1.5.1.zip
 #
 # For C++ Libtorch AlphaZero on macOS we recommend this URL:
-# https://download.pytorch.org/libtorch/cpu/libtorch-macos-1.8.0.zip
-export OPEN_SPIEL_BUILD_WITH_LIBTORCH_DOWNLOAD_URL="${OPEN_SPIEL_BUILD_WITH_LIBTORCH_DOWNLOAD_URL:-"https://download.pytorch.org/libtorch/cpu/libtorch-cxx11-abi-shared-with-deps-1.5.1%2Bcpu.zip"}"
+# https://download.pytorch.org/libtorch/cpu/libtorch-macos-1.10.1.zip
+#
+# Note: there are currently known problems with the C++ PyTorch: inteferences
+# with pybind11 versions. Until it is properly fixed, there is a workaround:
+# https://github.com/deepmind/open_spiel/issues/966#issuecomment-1322982393
+export OPEN_SPIEL_BUILD_WITH_LIBTORCH_DOWNLOAD_URL="${OPEN_SPIEL_BUILD_WITH_LIBTORCH_DOWNLOAD_URL:-"https://download.pytorch.org/libtorch/cpu/libtorch-cxx11-abi-shared-with-deps-1.10.1%2Bcpu.zip"}"
 
 # TensorflowCC is a CMake interface to the Tensorflow C++ API. It is used in
 # C++ AlphaZero. See: https://github.com/deepmind/open_spiel/blob/master/docs/alpha_zero.md