Add decision tree for choosing BigDL libraries in index page

docs/readthedocs/source/conf.py

@@ -113,7 +113,8 @@
     'sphinx_external_toc',
     'sphinx_design',
     'nbsphinx',
-    'nbsphinx_link'
+    'nbsphinx_link',
+    'sphinx.ext.graphviz' # for embedded graphviz diagram
 ]
 
 # Add any paths that contain templates here, relative to this directory.
@@ -274,4 +275,7 @@ def setup(app):
     app.add_transform(AutoStructify)
 
 # disable notebook execution
-nbsphinx_execute = 'never'
+nbsphinx_execute = 'never'
+
+# make output of graphviz diagram to svg
+graphviz_output_format = 'svg'

docs/readthedocs/source/index.rst

@@ -11,3 +11,40 @@ BigDL seamlessly scales your data analytics & AI applications from laptop to clo
 - `PPML <doc/PPML/index.html>`_ (experimental): Secure Big Data and AI (with SGX Hardware Security)
 
 ------
+
+Choosing the right BigDL library
+---------------------------
+
+.. graphviz::
+
+    digraph BigDLDecisionTree {
+        node [color="#459db9" shape="box" fontname="Arial" fontsize=14]
+        edge [fontname="Arial" fontsize=12]
+
+        Feature1 [label="Hardware Secured Big Data & AI?"]
+        Feature2 [label="Python vs. Scala/Java?"]
+        Feature3 [label="What type of application?"]
+        Feature4 [label="Domain?"]
+
+        Orca[href="../doc/Orca/index.html" target="_blank" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        Nano[href="../doc/Nano/index.html" target="_blank" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        DLlib1[label="DLlib" href="../doc/DLlib/index.html" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        DLlib2[label="DLlib" href="../doc/DLlib/index.html" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        Chronos[href="../doc/Chronos/index.html" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        Friesian[href="../doc/Friesian/index.html" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+        PPML[href="../doc/PPML/index.html" target="_blank" style="rounded,filled" fillcolor="#459db9" fontcolor="#ffffff"]
+
+        Feature1 -> Feature2[label="No"]
+        Feature1 -> PPML[label="Yes"]
+
+        Feature2 -> Feature3[label="Python"]
+        Feature2 -> DLlib1[label="Scala/Java"]
+
+        Feature3 -> Orca[label="Distributed Big Data \n + \n  AI (TF/PyTorch)"]
+        Feature3 -> Nano[label="Accelerate \n TensorFlow / PyTorch"]
+        Feature3 -> DLlib2[label="DL for Spark MLlib"]
+        Feature3 -> Feature4[label="High Level \n  App Framework"]
+
+        Feature4 -> Chronos[label="Time Series"]
+        Feature4 -> Friesian[label="Recommender System"]
+    }