CRF - 条件随机场 工具包（python/c++）
项目案例 ConvCRF+FullCRF
https://github.com/MarvinTeichmann/ConvCRF
需要的包Optional Packages: pyinn, pydensecrf
pip install git+https://github.com/szagoruyko/pyinn.git@master
pytorch-crf 工具
Python 3.6 PyTorch 1.0.0
pip install pytorch-crf or pip install git+https://github.com/kmkurn/pytorch-crf#egg=pytorch_crf
https://github.com/kmkurn/pytorch-crf
文档：https://pytorch-crf.readthedocs.io/en/stable/
pydensecrf crf工具
https://github.com/lucasb-eyer/pydensecrf
pip install git+https://github.com/lucasb-eyer/pydensecrf.git
crfsuite python包
https://pypi.org/project/python-crfsuite/
pip install python-crfsuite
CRF++工具
CRF++: Yet Another CRF toolkit https://taku910.github.io/crfpp/