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CRFsuite: a fast implementation of Conditional Random Fields (CRFs)

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## Build

```shell
  134  git clone https://github.com/enterprise-search/liblbfgs.git
  135  git clone https://github.com/enterprise-search/crfsuite.git
  136  cd crfsuite/
  137  sh autogen.sh 
  138  ./configure --with-liblbfgs=../liblbfgs
  139  make -j 8
  140  pwd
  141  ./configure --with-liblbfgs=/home/max_zhang_airwallex_com/liblbfgs
  142  make -j 8
  143  make
  144  make install
  145  cd swig/python/
  146  ls
  147  sh prepare.sh 
  148  python3 setup.py build_ext
  149  cd ../..
  150  sudo make install
  151  cd -
  152  python3 setup.py build_ext
  153  sudo make install
  154  ls
  155  python3
  156  cd -
  157  python3
  158  cd swig/python/
  159  ls
  160  ls build/
  161  find build/
  162  cd build/lib.linux-x86_64-3.10/
  163  python3
  164  cd ..
  165  ls
  166  make
  167  vi Mak
  168  sudo python3 setup.py install
  169  python3
  170  cd
  171  python3
  172  ls
  173  cd crfsuite/
  174  sudo make install
  175  echo $?
  176  cd swig/python/
  177  sudo python3 setup.py install
  178  cd
  179  python3
  180  python -c "import sys; print(sys.path)"
  181  python3 -c "import sys; print(sys.path)"
  182  echo $LD_LIBRARY_PATH
  183  env LD_LIBRARY_PATH=/usr/local/lib python3
  188  curl -O https://www.cnts.ua.ac.be/conll2000/chunking/train.txt.gz
  190  gunzip train.txt.gz 
  192  less train.txt 
  194  cd crfsuite/
  196  env LD_LIBRARY_PATH=/usr/local/lib python3 example/ner.py 
  197  env LD_LIBRARY_PATH=/usr/local/lib python3 example/ner.py < ../train.txt 
  198  less ../train.txt 
  199  env LD_LIBRARY_PATH=/usr/local/lib python3 example/chunking.py < ../train.txt 
  200  env LD_LIBRARY_PATH=/usr/local/lib python3 example/chunking.py < ../train.txt > train.data
  201  less train.data 
  202  ls
  203  crfsuite learn train.data 
  204  env LD_LIBRARY_PATH=/usr/local/lib crfsuite learn train.data 
  205  history
```

## References

- https://www.chokkan.org/software/crfsuite/tutorial.html

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