Add docs for ABCI3.0.

docs/source/user_guide/torch.rst

@@ -7,6 +7,47 @@ Writing a simple training script
 Running inference
 -----------------
 
+To run aiaccel on ABCI3.0, you need an environment with Python 3.10.
+This guide explains how to set up the environment using Singularity.
+
+.. note::
+
+    For details on how to use Singularity, please refer to the following documentation:
+    https://docs.abci.ai/v3/en/containers/
+
+Create the following Singularity definition file:
+
+.. code-block:: bash
+    :caption: aiaccel_env.def
+
+    BootStrap: docker
+
+    From: python:3.10
+
+    %post
+
+        pip install --upgrade pip
+
+        # aiaccel env
+        pip install aiaccel[torch]@git+https://github.com/aistairc/aiaccel.git@develop/v2
+
+        # torch/MNIST example env
+        pip install torchvision
+
+
+Use the Singularity definition file to build a Singularity image file:
+
+.. code-block:: bash
+
+    singularity build aiaccel.sif aiaccel_env.def
+
+Use the Singularity image file to execute aiaccel:
+
+.. code-block:: bash
+
+    singularity exec --nv aiaccel.sif python -m aiaccel.torch.apps.train $wd/config.yaml --working_directory $wd
+
+
 Writing a DDP training script
 -----------------------------