minor change

Author: QuillPusher

_pages/automatic_differentiation.md

@@ -78,7 +78,7 @@ traversal and derivative accumulation results in two approaches:
 Automated Differentiation implementations are based on [two major techniques]:
 Operator Overloading and Source Code Transformation. Compiler Research Group's
 focus has been on exploring the [Source Code Transformation] technique, which
-involves  constructing the computation graph and producing a derivative at
+involves constructing the computation graph and producing a derivative at
 compile time. 
 
 [The source code transformation approach] enables optimization by retaining