Added the flag to use 4GB memory for sorting.

utilities/sort_dataset.sh

@@ -31,6 +31,5 @@
 # 
 # NOTE: We substract the escaped brackets because they're part of node labels.
 # 
-cat $input | awk '{print gsub("{","{")-gsub("\\\\{","\\{"), $0}' | sort -n | \
-cut -d' ' -f2-
- # > "${1%.bracket}_sorted.bracket"
+cat $input | awk '{print gsub("{","{")-gsub("\\\\{","\\{"), $0}' | \
+sort -n --buffer-size=4G | cut -d' ' -f2-