[SAMOA-52] VHT performance problem with nominal attributes

• Type: Bug
• Status: Done
• Priority: Major
• Resolution: Done
• Component/s: SAMOA-API
• Assignee: Albert Bifet
• Reporter: Albert Bifet
• Created: 07/Dec/15 11:18
• Updated: 03/Apr/16 07:56
• Resolved: 03/Apr/16 07:56

Description

When running artificial experiments using only nominal attributes with

 generators.RandomTreeGenerator -c 2 -o 50 -u 0

2 classes, 50 nominal attributes, 0 numerical attributes, accuracy goes down to 53%. However, in the case

 generators.RandomTreeGenerator -c 2 -o 50 -u 0

with 50 numerical attributes, 0 nominal attributes, VHT is performing well with 95.42% of accuracy.

To reproduce:

bin/samoa local target/SAMOA-Local-0.4.0-incubating-SNAPSHOT.jar "PrequentialEvaluation -d /tmp/dump.csv -i 1000000 -f 100000 -l (classifiers.trees.VerticalHoeffdingTree -p 4) -s (generators.RandomTreeGenerator -c 2 -o 50 -u 0)"