Avoid repeatedly calling into char_indices to build ngrams #457
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This adds a single allocation of an appropriately sized deque shared between all words of a text to avoid repeatedly restarting the UTF-8 decoding of the words. Instead a single pass using char_indices suffices by keeping the last n indices as upcoming offsets in the deque.
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This adds a single allocation of an appropriately sized deque shared between all words of a text to avoid repeatedly restarting the UTF-8 decoding of the words. Instead a single pass using char_indices suffices by keeping the last n indices as upcoming offsets in the deque.