[DOC] Update roadmap

Author: xuyxu

docs/roadmap.rst

@@ -1,8 +1,36 @@
 Roadmap
 =======
 
-[0.1.0] - ~
------------
+Anyone is welcomed to work on any feature or enhancement listed below. Your contributions would be clearly posted in `Contributors <./contributors.html>`__ and `Changelog <./changelog.html>`__.
 
-* Add the partial-fit mode for all ensembles.
-* Support manually-specified criteria in the ``predict`` function.
+Long-term Objective
+-------------------
+
+* |MajorFeature| |API| Verify the effectiveness of new ensembles that could be included in torchensemble
+* |Efficiency| Improve the training and evaluating efficiency of existing ensembles
+
+New Functionality
+-----------------
+
+* |MajorFeature| |API| Add the partial-fit mode for all ensembles
+* |MajorFeature| |API| Support manually-specified evaluation metrics when calling :meth:`predict`
+* |MajorFeature| |API| Integration with :mod:`torch.utils.tensorboard` for better visualization
+* |MajorFeature| |API| Support arbitrary training criteria for existing ensembles
+
+Maintenance Related
+-------------------
+
+* |Enhancement| Refactor existing code to reduce the redundancy
+
+.. role:: raw-html(raw)
+   :format: html
+
+.. role:: raw-latex(raw)
+   :format: latex
+
+.. |MajorFeature| replace:: :raw-html:`<span class="badge badge-success">Major Feature</span>` :raw-latex:`{\small\sc [Major Feature]}`
+.. |Feature| replace:: :raw-html:`<span class="badge badge-success">Feature</span>` :raw-latex:`{\small\sc [Feature]}`
+.. |Efficiency| replace:: :raw-html:`<span class="badge badge-info">Efficiency</span>` :raw-latex:`{\small\sc [Efficiency]}`
+.. |Enhancement| replace:: :raw-html:`<span class="badge badge-info">Enhancement</span>` :raw-latex:`{\small\sc [Enhancement]}`
+.. |Fix| replace:: :raw-html:`<span class="badge badge-danger">Fix</span>` :raw-latex:`{\small\sc [Fix]}`
+.. |API| replace:: :raw-html:`<span class="badge badge-warning">API Change</span>` :raw-latex:`{\small\sc [API Change]}`