Update docs

Author: lululxvi

docs/modules/deepxde.backend.rst

@@ -1,6 +1,34 @@
 deepxde.backend package
 =======================
 
+Subpackages
+-----------
+
+.. toctree::
+   :maxdepth: 4
+
+   deepxde.backend.tensorflow
+   deepxde.backend.tensorflow_compat_v1
+
+Submodules
+----------
+
+deepxde.backend.backend module
+------------------------------
+
+.. automodule:: deepxde.backend.backend
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
+deepxde.backend.set\_default\_backend module
+--------------------------------------------
+
+.. automodule:: deepxde.backend.set_default_backend
+   :members:
+   :undoc-members:
+   :show-inheritance:
+
 Module contents
 ---------------
 

docs/modules/deepxde.backend.tensorflow.rst

@@ -0,0 +1,10 @@
+deepxde.backend.tensorflow package
+==================================
+
+Module contents
+---------------
+
+.. automodule:: deepxde.backend.tensorflow
+   :members:
+   :undoc-members:
+   :show-inheritance:

docs/modules/deepxde.backend.tensorflow_compat_v1.rst

@@ -0,0 +1,10 @@
+deepxde.backend.tensorflow\_compat\_v1 package
+==============================================
+
+Module contents
+---------------
+
+.. automodule:: deepxde.backend.tensorflow_compat_v1
+   :members:
+   :undoc-members:
+   :show-inheritance: