BLEU score evaluation in NLP - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the BLEU score function from nltk.

NLP

from nltk.translate.bleu_score import [1]

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Ableu_score

Bsentence_bleu

Ccorpus_bleu

Dbleu

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'bleu_score' which is the module, not the function.

Using 'corpus_bleu' which is for multiple sentences.

The function sentence_bleu is used to calculate BLEU score for a single sentence.

2fill in blank

medium

Complete the code to define the reference translations list for BLEU score calculation.

NLP

references = [[[1]]]

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A['test', 'a', 'is', 'this']

B['this is a test']

C['This', 'is', 'a', 'test']

D['this', 'is', 'a', 'test']

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single string instead of a list of tokens.

Not nesting the list inside another list.

References must be a list of tokenized sentences, so a list of lists of words.

3fill in blank

hard

Fix the error in the candidate sentence tokenization for BLEU score calculation.

NLP

candidate = [1]

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A['this is a test']

B'this is a test'

C['this', 'is', 'a', 'test']

D['This', 'is', 'a', 'test']

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the candidate as a string instead of a list.

Passing a list with one string element instead of tokenized words.

The candidate sentence must be a list of tokens (words) for BLEU calculation.

4fill in blank

hard

Fill both blanks to calculate the BLEU score for the candidate against references.

NLP

score = sentence_bleu([1], [2])

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Areferences

Bcandidate

C[candidate]

Dreferences[0]

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of references and candidate.

Passing candidate inside a list instead of directly.

The first argument is the list of reference sentences, the second is the candidate sentence.

5fill in blank

hard

Fill all three blanks to print the BLEU score rounded to 2 decimals with a message.

NLP

print(f"BLEU score: [1]([2], 2)[3]")

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Around

Bscore

C+

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of + for string concatenation.

Not rounding the score before printing.

Use round(score, 2) to round the BLEU score, then concatenate with the message.