Capsizing of use and can usually be recovered by the crew. Some types of dinghy are occasionally deliberately capsized, as capsizing and righting the vessel again can be the fastest means of draining water from the boat. Capsizing (but not necessarily turtling) is an inherent part of dinghy sailing. It is not a question of "if" but a question of "when". For those who do not want the experience, a keelboat monohull has physics on its side. But even yachts can capsize and turtle in extraordinary conditions, so design considerations are important. Such events can overcome skill and experience; boats need
Referring expression generation different human participants in the corpus. Also sometimes a measure called Perfect Recall Percentage (PRP) or Accuracy is used which calculates the percentage of perfect matches between an algorithm-produced and a human-produced reference. For the "linguistic realization" part of REG the overlap between strings has been measured using metrics like BLEU or NIST. A problem that occurs with string-based metrics is that for example "The small monkey" is measured closer to "The small donkey" than to "The little monkey". A more time consuming way to evaluate REG algorithms is by letting humans judge the "Adequacy" (How clear is the description?)