The code to our LDA implementation on Hadoop is released on Github under the Mozilla Public License. It’s seriously fast and scales very well to 1000 machines or more (don’t worry, it runs on a single machine, too). We believe that at present this is the fastest implementation you can find, in particular if you want to have a) 1000s of topics, b) a large dictionary, c) a large number of documents,
![Speeding up Latent Dirichlet Allocation](https://cdn-ak-scissors.b.st-hatena.com/image/square/9ff40cb6e7c55351a253cadb47f16b77f95272de/height=288;version=1;width=512/http%3A%2F%2F27.media.tumblr.com%2Favatar_d2f599cc2dce_128.png)