[tune] PB2 (#11466)

Co-authored-by: Sumanth Ratna <sumanthratna@gmail.com>
Co-authored-by: Amog Kamsetty <amogkamsetty@yahoo.com>
Co-authored-by: Amog Kamsetty <amogkam@users.noreply.github.com>
Co-authored-by: Richard Liaw <rliaw@berkeley.edu>

doc/source/tune/examples/index.rst

@@ -18,6 +18,7 @@ General Examples
 - :doc:`/tune/examples/pbt_example`: Example of using a Trainable class with PopulationBasedTraining scheduler.
 - :doc:`/tune/examples/pbt_function`: Example of using the function API with a PopulationBasedTraining scheduler.
 - :doc:`/tune/examples/pbt_ppo_example`: Example of optimizing a distributed RLlib algorithm (PPO) with the PopulationBasedTraining scheduler.
+- :doc:`/tune/examples/pb2_ppo_example`: Example of optimizing a distributed RLlib algorithm (PPO) with the PB2 scheduler. Uses a small population size of 4, so can train on a laptop.
 - :doc:`/tune/examples/logging_example`: Example of custom loggers and custom trial directory naming.
 
 Search Algorithm Examples

doc/source/tune/examples/pb2_example.rst

@@ -0,0 +1,6 @@
+:orphan:
+
+pb2_example
+~~~~~~~~~~~
+
+.. literalinclude:: /../../python/ray/tune/examples/pb2_example.py

doc/source/tune/examples/pb2_ppo_example.rst

@@ -0,0 +1,6 @@
+:orphan:
+
+pb2_ppo_example
+~~~~~~~~~~~~~~~
+
+.. literalinclude:: /../../python/ray/tune/examples/pb2_ppo_example.py