For fun, I decided Wolfrat Bot needed a bit more, err, personality. So, I set off to make him one. After training an RNN for a few hours on my desktop’s GPU, I had interesting results but ultimately failed at achieving quite what I wanted.

Anyway, I encountered some huge hurdles I found out AFTER training for ~8 hours that the way I was encoding the characters for the network input (and thus, the way I was decoding the network output) behaved non-deterministically between Python 3.5 runtimes! I was constructing a set out of the input dataset, and making a dictionary out of it. In Python 2.7, it behaved the same way every time. Now, I don’t expect sets to store the elements in any order (that’s kinda the point), but I had at least expected the order to be consistent, though I guess that was awfully presumptious of me.

To demonstrate, running python3 -c 'print(set("test"))' more than once yields different results for me. On the other hand, running python2 -c 'print(set("test"))' more than once always yields the same results.

The results were about what I expected from the character RNN model that I used - it generates messages, but it doesn’t generate replies. The following exchange demonstrates what I mean:

Me: How are you?  
RNN: Yes.
Me: What are you up to?
RNN: u suit the lack of empires
Me: Do you hate me?
RNN: we could do is that the guy who dont see a student
Me: Who am I?
RNN: we still don't know if they wanted to other people equivale won't tell us a strategy free episodes of distributed stuff in the CVRL and i3status integes, desktop gram
Me: That didn't even make any sense.
RNN: it's confusing it
Me: me too

OK, that last one is the interesting - up until ‘status’ that link is perfectly valid. Regardless, it doesn’t seem to care what was said previously - it just says whatever it feels like. It is clear that a different approach might be necessary for achieving good results - a character level RNN might be insufficient for generating relevant conversation.

Tags: Projects Tensorflow Web RNN Neural Networks Chatbot
Part of a series on For Fun.