How to normalize an array in NumPy?

Machine Learning

I would like to have the norm of one NumPy array. More specifically, I am looking for an equivalent version of this function

def normalize(v): 

norm = np.linalg.norm(v) 

if norm == 0: 

return v 

return v / norm

Is there something like that in sklearn or numpy?

 

This function works in a situation where v is the 0 vector.

3
Answers

Aug 4th, 2020 By: Tabres

Replies

The below code can be used to normalize an array in NumPy.


x = np.random.rand(1000)*10


norma = x / np.linalg.norm(x)


normb = normalize(x[:,np.newaxis], axis=0).ravel()


print np.all(norma == normb)


# True

8 months ago - By bababasker
 

Here is the code that can give you optimal performance.



import numpy as np



def normalized(a, axis=-1, order=2):


    l2 = np.atleast_1d(np.linalg.norm(a, order, axis))


    l2[l2==0] = 1


    return a / np.expand_dims(l2, axis)



A = np.random.randn(3,3,3)


print(normalized(A,0))


print(normalized(A,1))


print(normalized(A,2))



print(normalized(np.arange(3)[:,None]))


print(normalized(np.arange(3)))

8 months ago - By ram
 
Load More
 

If you want to unleash your potential in this competitive field, please visit the Machine Learning course page for more information, where you can find the Machine Learning tutorials and Machine Learning frequently asked interview questions and answers as well.

 

This topic has been locked/unapproved. No replies allowed

Login to participate in this discussion.

Leave a reply

Before proceeding, please check your email for a verification link. If you did not receive the email, click here to request another.

Categories