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+# Reinforcement Learning on Hypha
+
+## Overview
+
+As part of the SRIND challenge, we also want to add the capabilities to Hypha to run Reinforcement 
+Learning (RL) workloads. Compared to the supervised or unsupervised training regime, RL works 
+fundamentaly different. Thus, this RFC highlights where the concepts diverge and why this is a
+challenge in the current version of Hypha. Then, it will propose a way on how to enable Hypha for RL
+without breaking its concepts.
+
+## Background
+
+While (un-)supervised ML follows the schema of data being ingested by a model for training, RL comes without
+any prepared training data. Instead, it needs a simulation (usually called an environment) of the process 
+that should be solved. For example, this can be the environment for the Atari games, where the RL agent can send
+actions that will be performed by the simulator. For the Atari games, this is something like pressing a button
+to performing an action in the game.
+
+Thus, the training process creates its own training data, and the training data is updated over time. This
+doesen't fit into Hypha's current architecture, where data is served from a static, preprocessed dataset.
+This architecture is depicted in belows diagram.
+
+```mermaid
+---
+config:
+  theme: redux
+---
+sequenceDiagram
+    participant S as Scheduler
+    participant W1 as Worker_1
+    participant W2 as Worker_2
+    participant PS as Parameter Server
+    participant D as Data Node
+    loop Do Work
+            loop local rounds
+                W1 -->> S: Request Data
+                S -->> W1: Data Batch
+                W1 -->> D: Reuest Batch
+                D -->> W1: Send Batch
+                W1-->W1: Work on Batch
+                W2 -->> S: Request Data
+                S -->> W2: Data Batch
+                W2 -->> D: Reuest Batch
+                D -->> W1: Send Batch
+                W2-->W2: Work on Batch
+            end
+            W1-->> PS: Send Gradient
+            W2 -->> PS: Send Gradient
+            PS -->> W1: Send Parameters
+            PS -->> W2: Send Parameters
+    end
+```
+
+## Proposal
+
+To enable RL, we need two things: Data Nodes that are capable of running an environment and multiple
+Data Nodes because creating samples for the worker to train on is essential. What is beneficial in this
+scenario is that RL models are usually quite small and don't need GPUs for inference. However, to
+produce enough training samples, simulating the environment and running inference need to be fast. Thus,
+RL Data Nodes are quite heavy on CPU load. In terms of heterogeneous hardware requirements, RL is a perfect
+match for Hypha, since it will need both GPU- and CPU-powered workers.
+
+To fulfill the first requirement, a special RL Data Node needs to be implemented. The Data Node needs to 
+run the environment and the current model. Therefore, it will also need to be able to receive model updates.
+The RL Data Node will run a continuous data generation process that should possibly run in parallel. The
+resulting training data will be stored in a FIFO circular buffer. The buffer needs to provide random
+access to the samples for training. To enhance efficiency, the buffer should also be held in memory for faster
+access times.
+
+The second requirement will be satisfied by improving the Scheduler to redirect Worker requests for data to
+different RL Data Nodes. Thus, the Scheduler needs to balance latency between RL Data Nodes and Workers as
+well as sampling and processing speed.
+
+The above solution will look like the following.
+
+```mermaid
+---
+config:
+  theme: redux
+---
+sequenceDiagram
+    participant S as Scheduler
+    participant W1 as Worker_1
+    participant W2 as Worker_2
+    participant PS as Parameter Server
+    participant D1 as RL Data Node 1
+    participant D2 as RL Data Node 2
+    loop Do Work
+      loop local rounds
+        W1 -->> S: Request Data
+        S -->> W1: Data Batch from Data Node 2
+        W1 -->> D2: Reuest Batch
+        D2 -->> W1: Send Batch
+        W1-->W1: Work on Batch
+        W2 -->> S: Request Data
+        S -->> W2: Data Batch from Data Node 1
+        W2 -->> D1: Reuest Batch
+        D1 -->> W1: Send Batch
+        W2-->W2: Work on Batch
+      end
+      W1-->> PS: Send Gradient
+      W2 -->> PS: Send Gradient
+      PS -->> W1: Send Parameters
+      PS -->> W2: Send Parameters
+      PS -->> D1: Send Parameters
+      PS -->> D2: Send Parameters
+  end
+```