Python: how to flip the labels of data from 1 to 0 and vice versa

Question

I am using sklearn's LabelEncoder() to encode the labels of data with value 0 and 1. The labels assigned to the data by the function need to be changed from 0 to 1 and vice versa. How can I flip the labels?

Answer 1

You can subtract the outcome of transform() from 1 to flip the labels of your data. Check the following example.

>>> from sklearn import preprocessing
>>> le = preprocessing.LabelEncoder()
>>> Y=['p','p','e','e','e','p','e','p']
>>> le.fit(Y)
LabelEncoder()
>>> le.transform(Y) #get numeric label
array([1, 1, 0, 0, 0, 1, 0, 1], dtype=int64)
>>> 1-le.transform(Y)  # flip the label
array([0, 0, 1, 1, 1, 0, 1, 0], dtype=int64)
>>>