What is 1 of K encoding. One hot representation. (Python)

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・1 of K Coding

Release date:2024/9/15　　　　　　　　　

・In Japanese

■1 of K coding explained

1 of K coding is a method to create an array in which only certain elements are 1 and the rest are 0. It is also called one hot representation. It is often used in machine learning.

■Example implementation of 1 of K encoding

An example implementation using numpy is as follows:

import numpy as np
a = np.zeros(5)　# Create an array with 5 elements, all with a value of 0
a[3] = 1　　　　# # Set the third element to 1
print(a)

　　⇒　array([0., 0., 0., 1., 0.])

See the implementation example using keras here

from keras.utils import np_utils
a= np_utils.to_categorical(3, 5)　　# Set the third element of a five-element array to 1
print(a)

　　⇒　array([0., 0., 0., 1., 0.], dtype=float32)

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