Table 5

The ratio of top frequent input embeddings to the total occurrences of input embeddings in training data. Obviously, multiple features significantly alleviate the problem of sparse data.

Proportion (%)TOP 100TOP 1KTOP 2K
Character Only 81.93 98.60 99.64 
w/ Multi-Feature 53.54 75.30 79.99 
Proportion (%)TOP 100TOP 1KTOP 2K
Character Only 81.93 98.60 99.64 
w/ Multi-Feature 53.54 75.30 79.99 
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