Improve rhyme function

[hyperreality]

At the moment, the rhyme function compares whether the final two syllables from the CMU dictionary are equal. This works for the majority of words, but many cause problems. For instance:

fire -> [[u'F', u'AY1', u'ER0'], [u'F', u'AY1', u'R']]
admire -> [[u'AE0', u'D', u'M', u'AY1', u'R']]
desire -> [[u'D', u'IH0', u'Z', u'AY1', u'ER0']]

Fire matches both admire and desire, but admire doesn't rhyme with desire...

Furthermore, for two syllable words, checking only the last syllable would probably improve things.

[oscardssmith]

I just found a really interesting article that's related. Anything useful here?
http://graphics.wsj.com/hamilton-methodology/

[hyperreality]

@oscardssmith Thanks, that looks really useful. I'll be thinking about it over the next few days, and also happy to review and merge a patch if you want to try implementing it.

[rsrobbins]

I found that the rhyme function did not work for me until I changed it from level=2 to level=1
def rhymes(word1, word2, level=1):

[hyperreality]

The rhymes function compares the last x phonemes of the word. So for monosyllabic words, like "show" and "low", it may only report a rhyme if you use level 1. Maybe level 1 is a better default setting to use than level 2, but I think it was too permissive. A system like RhymeBrain which scores rhymes on a scale is probably what we need.