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Vectorised and non vectorised code comparison in Python

vectorization is required in python when we are dealing with matrics. With the evolution of deep learning it has gained more lime-light.


Here is the execution time comparison of vectorised and non vectorised code.


# initialisation of array


import numpy as np
a=np.array([1,2,3,4])
print(a)

output-

[1 2 3 4]

# initialise numpy array

import time
A = np.random.rand(1000000)
B = np.random.rand(1000000)
# calculating execution time using vectorization
tic = time.time()
C =np.dot(A, B)
toc =time.time()
print('total time taken in vectorised multiplication' + str(toc-tic) + 'mili-seconds')

total time taken in vectorised multiplication 0.002000093460083008 mili-seconds



# calculating execution time using non vectorization codetic = time.time()
for i in range(1000000):
    C = C +A[i]*B[i]   
print(C)
toc= time.time()
print('total time taken in non-vectorised code'+ str(toc-tic) +' mili seconds')

749296.5132501889 total time taken in non-vectorised code0.6779999732971191 mili seconds.






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