Update docs page on observations

docs/source/about.rst

@@ -182,16 +182,13 @@ All ACL rules are considered when applying an IER. Logic follows the order of ru
 
 Observation Spaces
 ******************
+The observation space provides the blue agent with information about the current status of nodes and links.
 
-The OpenAI Gym observation space provides the status of all nodes and links across the whole system:​
+PrimAITE builds on top of Gym Spaces to create an observation space that is easily configurable for users. It's made up of components which are managed by the :py:class:`primaite.environment.observations.ObservationHandler`. Each training scenario can define its own observation space, and the user can choose which information to inlude, and how it should be formatted.
 
-* Nodes (in terms of hardware state, Software State, file system state and services state) ​
-* Links (in terms of current loading for each service/protocol)
-
-The observation space can be configured as a ``gym.spaces.Box`` or ``gym.spaces.MultiDiscrete``, by setting the ``OBSERVATIONS`` parameter in the laydown config.
-
-Box-type observation space
---------------------------
+NodeLinkTable component
+-----------------------
+For example, the :py:class:`primaite.environment.observations.NodeLinkTable` component represents the status of nodes and links as a ``gym.spaces.Box`` with an example format shown below:
 
 An example observation space is provided below:
 
@@ -249,8 +246,6 @@ An example observation space is provided below:
      - 5000
      - 0
 
-The observation space is a 6 x 6 Box type (OpenAI Gym Space) in this example. This is made up from the node and link information detailed below.
-
 For the nodes, the following values are represented:
 
  * ID
@@ -290,9 +285,9 @@ For the links, the following statuses are represented:
  * SoftwareState = N/A
  * Protocol = loading in bits/s
 
-MultiDiscrete-type observation space
-------------------------------------
-The MultiDiscrete observation space can be though of as a one-dimensional vector of discrete states, represented by integers.
+NodeStatus component
+----------------------
+This is a MultiDiscrete observation space that can be though of as a one-dimensional vector of discrete states, represented by integers.
 The example above would have the following structure:
 
 .. code-block::
@@ -301,9 +296,6 @@ The example above would have the following structure:
     node1_info
     node2_info
     node3_info
-    link1_status
-    link2_status
-    link3_status
   ]
 
 Each ``node_info`` contains the following:
@@ -318,7 +310,25 @@ Each ``node_info`` contains the following:
     service2_state    (0=none, 1=GOOD, 2=PATCHING, 3=COMPROMISED)
   ]
 
-Each ``link_status`` is just a number from 0-4 representing the network load in relation to bandwidth.
+In a network with three nodes and two services, the full observation space would have 15 elements. It can be written with ``gym`` notation to indicate the number of discrete options for each of the elements of the observation space. For example:
+
+.. code-block::
+
+  gym.spaces.MultiDiscrete([4,5,6,4,4,4,5,6,4,4,4,5,6,4,4])
+
+LinkTrafficLevels
+-----------------
+This component is a MultiDiscrete space showing the traffic flow levels on the links in the network, after applying a threshold to convert it from a continuous to a discrete value.
+The number of bins can be customised with 5 being the default. It has the following strucutre:
+.. code-block::
+
+  [
+    link1_status
+    link2_status
+    link3_status
+  ]
+
+Each ``link_status`` is a number from 0-4 representing the network load in relation to bandwidth.
 
 .. code-block::
 
@@ -328,12 +338,11 @@ Each ``link_status`` is just a number from 0-4 representing the network load in
   3 = high traffic (<100%)
   4 = max traffic/ overwhelmed (100%)
 
-The full observation space would have 15 node-related elements and 3 link-related elements. It can be written with ``gym`` notation to indicate the number of discrete options for each of the elements of the observation space. For example:
+If the network has three links, the full observation space would have 3 elements. It can be written with ``gym`` notation to indicate the number of discrete options for each of the elements of the observation space. For example:
 
 .. code-block::
 
-  gym.spaces.MultiDiscrete([4,5,6,4,4,4,5,6,4,4,4,5,6,4,4,5,5,5])
-
+  gym.spaces.MultiDiscrete([5,5,5])
 
 Action Spaces
 **************