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What is an SBPH 'feature' ?
Single words hash to features (e.g. ' S1618 ')
Phrases hash to features (e.g. 'to unsubscribe')
Even phrases with wildcards make features
- (e.g. 'BUY <foo> ONLINE NOW' )
Each word in a text affects 2N-1 features, we use N=5 (a five-word sliding window) in CRM114
Far more features than words than there were words in the original text!