He USES the example of natural language processing and grammar checking to show that probabilistic approach may work a lot better and be computationally cheaper.
他以自然语言处理和语法检查为例说明了概率方法可能更合适于验证工作,并且在计算花销上也更小。
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A probabilistic context-free grammar (or PCFG) is a context-free grammar that associates a probability with each of its productions.