Pivot a Hive table
There is no built-in pivot function in Hive, but one can still do it with relative ease.
Recent Posts
Schema on write v.s. schema on read
A runner’s view on this database concept.
Platt scaling for probability calibration
For classification problems, sometimes we care about the narrative of the predicted scores more than the predicted class. But the predicted scores can not al...
Gradient descent with the right step
Gradient descent is one of the most important tools in machine learning, but how hard can it be?
Book roundup, August 2018
How to lie, to get rich, with statistics, and to play people’s mind.