Why is exact deduplication not enough? What does MinHas...

Exact deduplication is insufficient for large-scale web corpora because it misses near-duplicates that provide no additional training signal. MinHash addresses this by representing documents as sets of n-gram shingles and estimating their Jaccard similarity. Locality Sensitive Hashing (LSH) is then used to group these documents into buckets based on their signatures, allowing for efficient identification of near-duplicates without requiring expensive pairwise comparisons.