From 07fc52fba3ef21aed85a45df78cfe32da1a2a2b8 Mon Sep 17 00:00:00 2001
From: Ryan Curtin <ryan@ratml.org>
Date: Sun, 3 Apr 2022 12:51:28 -0400
Subject: [PATCH] Some clarifying comments.

---
 src/mlpack/methods/ann/ffn.hpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mlpack/methods/ann/ffn.hpp b/src/mlpack/methods/ann/ffn.hpp
index 2694b099b3..2afa8a7f37 100644
--- a/src/mlpack/methods/ann/ffn.hpp
+++ b/src/mlpack/methods/ann/ffn.hpp
@@ -537,9 +537,12 @@ class FFN
   //! except during training.
   MatType responses;
 
-  //! The current error for the backward pass.
+  //! Locally-stored output of the network from a forward pass; used by the
+  //! backward pass.
   MatType networkOutput;
+  //! Locally-stored output of the backward pass; used by the gradient pass.
   MatType networkDelta;
+  //! Locally-stored error of the backward pass; used by the gradient pass.
   MatType error;
 
   //! The current evaluation mode (training or testing).