Update readthedocs configuration

Signed-off-by: Gigon Bae <gbae@nvidia.com>

Author: gigony

docs/source/conf.py

@@ -19,6 +19,13 @@
         f"{READTHEDOCS_PROJECT}/envs/{READTHEDOCS_VERSION}/bin/activate; ../../run setup read_the_docs'",
         shell=True,
     )
+    # Update LD_LIBRARY_PATH for CUDA runtime
+    old_ld_library_path = os.environ.get("LD_LIBRARY_PATH", "")
+    # Note that 'python3.8' is hard-coded here, it should be updated if the Python version changes by
+    # .readthedocs.yml or other configurations.
+    os.environ["LD_LIBRARY_PATH"] = (
+        f"{READTHEDOCS_PROJECT}/envs/{READTHEDOCS_VERSION}/lib/python3.8/site-packages/nvidia/cuda_runtime/lib:{old_ld_library_path}"
+    )
     subprocess.call(
         "/bin/bash -c 'source /home/docs/checkouts/readthedocs.org/user_builds/"
         f"{READTHEDOCS_PROJECT}/envs/{READTHEDOCS_VERSION}/bin/activate; ../../run setup_gen_docs'",

run

@@ -306,6 +306,8 @@ install_python_dev_deps() {
         # Read the Docs site is using specific setuptools version so should not upgrade it.
         if [ "$config" = "read_the_docs" ]; then
             run_command ${MONAI_PY_EXE} -m pip install -q -U pip wheel build
+            # Install cuda runtime dependency
+            run_command ${MONAI_PY_EXE} -m pip install -q nvidia-cuda-runtime-cu12
         else
             run_command ${MONAI_PY_EXE} -m pip install -q -U setuptools pip wheel build
         fi