Maybe using spaces consistently instead of mixing with tabs?

[zuhao]

Although I'm not quite familiar with Weka or JRuby, the structures of the two files bayes.rb and bayes_utils.rb look quite clear to me.

Just one thing, the indentations used in these files seem to be inconsistent with each other, as well as other files (such as those in core/). This imposed slight difficulty when reading the code in the first place.

[arrigonialberto86]

Thank you Zuhao for commenting on that! I did not notice the tab/spaces problem until I reviewed the code on Github. I will fix it right away