A handful of GoDataDriven posts

In the past few weeks I’ve written a couple of blog posts at the GoDataDriven blog:

• Convert chararray user ID’s to integers with pig: here I explain how to use pig’s RANK function;

• Merge Mahout output from different algorithms: in this post I lay out a possible strategy to merge the output of different algorithms of Mahout item based collaborative filtering;

• Last but not least, the performance impact of vectorization post covers how NumPy can efficiently compute operations on arrays.