--- a/doc/v2_planning/requirements.txt	Tue Sep 14 18:43:42 2010 -0400
+++ b/doc/v2_planning/requirements.txt	Tue Sep 14 23:14:00 2010 -0400
@@ -77,3 +77,12 @@
     hyper-parameters, and want to easily be able to recover the full "processing
     pipeline" that performs best, and use it on real/test data later.
 
+OD comments: Note that R9 and R13 may conflict with each other. Some
+optimizations performed by R9 may modify the input "symbolic graph" in such a
+way that extracting the required components for "production purpose" (R13)
+could be made more difficult (or even impossible). Imagine for instance that
+the graph is modified to take advantage of the fact that k-fold validation can
+be performed efficiently internally by some specific algorithm. Then it may
+not be obvious anymore how to remove the k-fold split in the saved model you
+want to use in production.
+