Explicit Boundary Markers for Subword Vocabularies
Subword tokenizers represent many common words twice in space-using writing systems, once with a leading space and once without. The two entries have separate embeddings in models, so occurrences of one word are divided across rows that are trained independently, and the two forms need not even segment the string the same way: " together" may be a single entry while the same word without a preceding space is tokenized as "to|gether". Capitalization divides a word further, into as many as six forms. We introduce an alternative to standard whitespace conventions using an explicit word boundary marker, which prevents such duplication. Words are delimited by the boundary markers, and spaces b...
| Authors | Sander Land, Clara Meister |
|---|---|
| Primary category | cs.CL |
| Published | 9 August 2026 |
| Last updated at source | 12 August 2026 |
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