def get_pairs(word):
    """Return set of symbol pairs in a word.

    Word is represented as tuple of symbols (symbols being variable-length strings).
    """
    pairs = set()
    prev_char = word[0]
    for char in word[1:]:
        pairs.add((prev_char, char))
        prev_char = char
    return pairs
Return set of symbol pairs in a word.

    Word is represented as tuple of symbols (symbols being variable-length strings).
    
megatron_lm/megatron/deprecated_data_utils/tokenization_gpt2.py