Unlike most written languages in the world, the Chinese writing system does not use explicit delimiters (e.g., white space) to separate words in written text.
chinese word segmentation (cWS) conventionally serves as the first step in chinese language processing, especially for many downstream tasks such as text classification (Zeng et al., 2018), question answering (Liu et al., 2018), machine translation (Yang et al., 2018), etc.