Conditional Random Field（CRF）是重要的串学习模型，广泛用于自然语言处理的各个领域。CRF++是CRF的一个高效的实现，具有可扩展性好，功能强大的优点。-Conditional Random Field (CRF) is an important learning model series , widely used in natural language processing in various fields. CRF CRF is the realization of an efficient, with scalability, and powerful advantage.