one-hot-encoding – IT Nursery

How can I one hot encode in Python?

May 28, 2022 by IT Nursery

I have a machine learning classification problem with 80% categorical variables. Must I use one hot encoding if I want to use some classifier for the classification? Can i pass the data to a classifier without the encoding? I am trying to do the following for feature selection: I read the train file: num_rows_to_read = … Read more

Convert array of indices to 1-hot encoded numpy array

May 16, 2022 by IT Nursery

Let’s say I have a 1d numpy array a = array([1,0,3]) I would like to encode this as a 2D one-hot array b = array([[0,1,0,0], [1,0,0,0], [0,0,0,1]]) Is there a quick way to do this? Quicker than just looping over a to set elements of b, that is. 22 Answers 22