We report segmentation performance using precision, recall, and F-measure on boundaries (BP, BR, BF), and tokens (WP, WR, WF). We also report the exact-match (X) metric which computes the proportion of correctly segmented utterances. 
 Question: How is the word segmentation task evaluated?
precision, recall, and F-measure on boundaries (BP, BR, BF), and tokens (WP, WR, WF)  exact-match (X) metric