Add FAQs to doc (#827)

* Add FAQs

* small fixes

docs/source/faqs.rst

@@ -0,0 +1,67 @@
+Frequently Asked Questions (FAQs)
+=================================
+
+In this section, we collect issues reported by users and post the corresponding
+solutions.
+
+
+OSError: libtorch_hip.so: cannot open shared object file: no such file or directory
+-----------------------------------------------------------------------------------
+
+One user is using the following code to install ``torch`` and ``torchaudio``:
+
+.. code-block:: bash
+
+  pip install \
+    torch==1.10.0+cu111 \
+    torchvision==0.11.0+cu111 \
+    torchaudio==0.10.0 \
+    -f https://download.pytorch.org/whl/torch_stable.html
+
+and it throws the following error when running ``tdnn/train.py``:
+
+.. code-block::
+
+  OSError: libtorch_hip.so: cannot open shared object file: no such file or directory
+
+The fix is to specify the CUDA version while installing ``torchaudio``. That
+is, change ``torchaudio==0.10.0`` to ``torchaudio==0.10.0+cu11```. Therefore,
+the correct command is:
+
+.. code-block:: bash
+
+  pip install \
+    torch==1.10.0+cu111 \
+    torchvision==0.11.0+cu111 \
+    torchaudio==0.10.0+cu111 \
+    -f https://download.pytorch.org/whl/torch_stable.html
+
+AttributeError: module 'distutils' has no attribute 'version'
+-------------------------------------------------------------
+
+The error log is:
+
+.. code-block::
+
+  Traceback (most recent call last):
+    File "./tdnn/train.py", line 14, in <module>
+      from asr_datamodule import YesNoAsrDataModule
+    File "/home/xxx/code/next-gen-kaldi/icefall/egs/yesno/ASR/tdnn/asr_datamodule.py", line 34, in <module>
+      from icefall.dataset.datamodule import DataModule
+    File "/home/xxx/code/next-gen-kaldi/icefall/icefall/__init__.py", line 3, in <module>
+      from . import (
+    File "/home/xxx/code/next-gen-kaldi/icefall/icefall/decode.py", line 23, in <module>
+      from icefall.utils import add_eos, add_sos, get_texts
+    File "/home/xxx/code/next-gen-kaldi/icefall/icefall/utils.py", line 39, in <module>
+      from torch.utils.tensorboard import SummaryWriter
+    File "/home/xxx/tool/miniconda3/envs/yyy/lib/python3.8/site-packages/torch/utils/tensorboard/__init__.py", line 4, in <module>
+      LooseVersion = distutils.version.LooseVersion
+  AttributeError: module 'distutils' has no attribute 'version'
+
+The fix is:
+
+.. code-block:: bash
+
+  pip uninstall setuptools
+
+  pip install setuptools==58.0.4

docs/source/index.rst

@@ -21,6 +21,7 @@ speech recognition recipes using `k2 <https://github.com/k2-fsa/k2>`_.
    :caption: Contents:
 
    installation/index
+   faqs
    model-export/index
 
 .. toctree::