BPE Tokenization Function

The function tokenizes a given text using Byte Pair Encoding (BPE) codes, decomposing each word in the text into tokens represented by the BPE codes.

Technology Stack : Python's built-in re module, used for regular expression matching.

Code Type : Function

Code Difficulty : Intermediate

                
                    
def random_bpe_tokenization(text, bpe_codes):
    """
    Tokenizes a given text using Byte Pair Encoding (BPE) codes.
    """
    import re

    # Split the text into words
    words = re.findall(r'\S+', text)

    # Tokenize each word using the BPE codes
    tokenized_words = []
    for word in words:
        tokens = []
        while word:
            # Find the longest match of a BPE code
            for code in reversed(bpe_codes):
                if word.startswith(code):
                    tokens.append(code)
                    word = word[len(code):]
                    break
            else:
                # If no BPE code matches, add the word as a token
                tokens.append(word)
                break
        tokenized_words.extend(tokens)

    return ' '.join(tokenized_words)

# Example usage
bpe_codes = ['a', 'bb', 'c', 'd', 'da', 'db', 'dc', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
text = "This is a sample text for BPE tokenization"

tokenized_text = random_bpe_tokenization(text, bpe_codes)
print(tokenized_text)