In this post, you will learn about when to use LabelEncoder. As a data scientist, you must have a clear understanding on when to use LabelEncoder and when to use other encoders such as One-hot Encoder. Using appropriate type of encoders is key part of data preprocessing in machine learning model building lifecycle.
Here are some of the scenarios when you could use LabelEncoder without having impact on model.
Here is the Python code which transforms thebinary classes into encoding 0 and 1 using LabelEncoder. The Breast Cancer Wisconsin dataset is used for illustration purpose. The information about this dataset can be found at https://archive.ics.uci.edu/ml/datasets/Breast+Cancer+Wisconsin+(Diagnostic). Note that LabelEncoder is class of sklearn.preprocessing package.
import pandas as pd
from sklearn.preprocessing import LabelEncoder
df = pd.read_csv(
'https://archive.ics.uci.edu/ml/'
'machine-learning-databases'
'/breast-cancer-wisconsin/wdbc.data',
header=None)
#
# Load the training data (X) and labels (y)
#
X = df.loc[:, 2:].values
y = df.loc[:, 1].values
#
# Instantiate LabelEncoder
#
le = LabelEncoder()
y = le.fit_transform(y)
Here is the how the data looks like:
In case, you want to look at what all classes got transformed. You can use the following code representing attribute, classes_ on instance of LabelEncoder.
le.classes_
Read one related post on LabelEncoder – LabelEncoder example – single & multiple columns
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