Update exp-svd.md

Author: nsanthan

morea/nlp/exp-svd.md

@@ -15,6 +15,7 @@ morea_labels:
 \\( \newcommand{\upto}{,\ldots,} \\)
 \\( \newcommand{\prob}{\mathbb{P}} \\)
 
+## Motivation
 The singular value decomposition is a neat way to understand what is happening with matrix operations, and one good direction to interpret LLMs under the hood. We begin with a motivating example: the movie ratings data. The below is a snippet of preferences (from 1-5 where 5 is best) of 26 movies rated by 61 students (anonymized):
 
 <img src="./movieprefs.png" alt="Movie ratings" width="900px"/>