[rllib] Code for Supporting Shared Models (#775)

* Code for Supporting Shared Models

* Running (with vnet modification) - needs to be tested for performance

* Small fix for jenkins

* Linting

* linting

* Summaries

* Small refactoring + generalized to more domains

* Addressing changes

* Addressing changes

* Update envs.py

* Addressing changes

* convnet

* final touches

* Merge - new model

* final linting

* Changing iterations back

* Policy option removed, fixed small things

* Nits

* nit

* Linting

* Linting

python/ray/rllib/models/catalog.py

@@ -8,6 +8,7 @@ from ray.rllib.models.action_dist import (
     Categorical, Deterministic, DiagGaussian)
 from ray.rllib.models.fcnet import FullyConnectedNetwork
 from ray.rllib.models.visionnet import VisionNetwork
+from ray.rllib.models.convnet import ConvolutionalNetwork
 
 
 class ModelCatalog(object):
@@ -67,6 +68,10 @@ class ModelCatalog(object):
 
         return FullyConnectedNetwork(inputs, num_outputs, options)
 
+    @staticmethod
+    def ConvolutionalNetwork(inputs, num_outputs, options=None):
+        return ConvolutionalNetwork(inputs, num_outputs, options)
+
     @staticmethod
     def get_preprocessor(env_name):
         """Returns a suitable processor for the given environment.