pyfst

Python interface to OpenFst

Documentation: http://pyfst.github.io

Installation

1. Install OpenFst 1.3.4 pached with c++11 patch from Kaldi or OpenFST 1.4 (tested 2019-06-03)
2. Install requirements sudo pip install --upgrade pyyaml pystache cython
3. Build the fork using setup.py

# Change for your setting needed only if openfst is not in PYTHONPATH
export FST=your/path/to/openfst  
# Build it locally
python setup.py build_ext --inplace
# or install system wide
[sudo -E] python setup.py install

# In both case for further usage set LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$FST/lib:$FST/lib/fst:$LD_LIBRARY_PATH

Basic Usage

import fst

t = fst.Transducer()

t.add_arc(0, 1, 'a', 'A', 0.5)
t.add_arc(0, 1, 'b', 'B', 1.5)
t.add_arc(1, 2, 'c', 'C', 2.5)

t[2].final = 3.5

t.shortest_path() # 2 -(a:A/0.5)-> 1 -(c:C/2.5)-> 0/3.5 

The pyfst API is IPython notebook-friendly: the transducers objects are automatically drawn using Graphviz.

Docker

There is also a Dockerfile so that you can build pyfst and run it within a Docker image.

Build:

docker build -t pyfst .

Run:

docker run -p 8888:8888 -v `pwd`/notebooks:/notebooks -it pyfst sh -c "jupyter notebook --ip=0.0.0.0 /notebooks"

Jupyter notebooks will be available at http://localhost:8888/tree on your host machine.

Python examples are in /pyfst/examples. You can run them as follows:

docker run -it pyfst python /pyfst/examples/basic.py

License

Copyright:

• 2013 Victor Chahuneau
• 2013 Ondrej Platek
• 2016 Filip Jurcicek

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.