add tmp.rst (#4777)

* add tmp.rst

* fix bug

Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>

docs/source/index.rst

@@ -34,6 +34,7 @@ OneFlow API Reference
     regularizers  
     image
     train
+    tmp
 
 
 Indices and tables

docs/source/tmp.rst

+oneflow.tmp
+===================================
+Modules for neural networks
+----------------------------------
+.. currentmodule:: oneflow.tmp
+.. automodule:: oneflow.tmp
+    :members:
+    :imported-members: