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Anna71 [15]
2 years ago
14

Byte pair encoding is a data encoding technique. The encoding algorithm looks for pairs of characters that appear in the string

more than once and replaces each instance of that pair with a corresponding character that does not appear in the string. The algorithm saves a list containing the mapping of character pairs to their corresponding replacement characters.
For example, the string "THIS_IS_THE_BEST_WISH" can be encoded as "%#_#_%E_BEST_W#H" by replacing all instances of "TH" with "%" and replacing all instances of "IS" with "#".
Which of the following statements about byte pair encoding is true?
A. Byte pair encoding is an example of a lossy transformation because it discards some of the data in the original string.
B. Byte pair encoding is an example of a lossy transformation because some pairs of characters are replaced by a single character.
C. Byte pair encoding is an example of a lossless transformation because an encoded string can be restored to its original version.
D. Byte pair encoding is an example of a lossless transformation because it can be used to transmit messages securely.
Computers and Technology
1 answer:
erica [24]2 years ago
8 0

Answer:

C. Byte pair encoding is an example of a lossless transformation because an encoded string can be restored to its original version.

Explanation:

Byte pair encoding is a form of encoding in which the most common pairs of consecutive bytes of data are replaced by a single byte which does not occur within the set of data.

For example, if we has a string ZZaaAb, it can be encoded if the pairs of string ZZ are replaced by X and the second pair by Y. So, our data now becomes XYAb.

To get our original data, that is decode it, we just replace the data with the keys X = ZZ and Y = aa thus allowing our original data to be restored.

Since our original string is restored without loss of data, it implies that <u>byte pair encoding is an example of a lossless transformation because an encoded string can be restored to its original version.</u>

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Answer:

Check the output

Explanation:

# -*- coding: utf-8 -*-

"""

Created on Thu Apr 12 00:39:11 2018

author:

"""

stocks ={

       "tomato soup": 20,

       "cheese": 8,

       "bread": 6,

       "milk": 8,

       "butter": 7,

       "coffee": 8,

       "ice cream": 5,

       "orange juice": 12,

       "bacon": 6,

       "tortilla chips": 14,

       "ramen": 24 }

prices ={

       "tomato soup": 1.85,

       "cheese": 3.99,

       "bread": 2.50,

       "milk": 3.59,

       "butter": 1.99,

       "coffee": 5.99,

       "ice cream": 2.99,

       "orange juice": 2.50,

       "bacon": 5.49,

       "tortilla chips": 3.00,

       "ramen": 0.99 }

def grocery_cost(item_list,quantity_list):

   totalcost = 0

   for i in range(len(item_list)):

       totalcost=totalcost+(quantity_list[i]*prices[item_list[i]])

       

   return totalcost

def stock(item):

   print("Number of itmes present in the stock:",stocks[item])

print("Welcome to the on-line grocery store!!")

print("Items that are available for purchase:")

for key in stocks.keys():

   print(key)

#chosen foods

print("Enter the item with quantity or Enter 'Q' when you are done")

item_list=[]

quantity_list=[]

while True:

   item=input('Enter the item name: ')

   if item=='Q' or item=='q':

       break

   item_list.append(item)

   while True:

       quan=int(input('Enter the number of item: '))

       if stocks[item] >=quan:

           quantity_list.append(quan)

           break

       else:

           stock(item)

           print('Your requirement is higher than stock available. Please enter again!!')

print("\nTotal cost:", "$",grocery_cost(item_list,quantity_list))

Kindly check the output in the attached image below.

7 0
3 years ago
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