We present Pynini, an open-source library for the compilation of weighted finite-state transducers (WFSTs) and pushdown transducers (PDTs) from strings, context-dependent rewrite rules, and recursive transition networks. Pynini uses the OpenFst library for encoding, modifying, and applying WFSTs and PDTs. We describe the design of this library and the algorithms and interfaces used for compilation, optimization, and application, and provide two illustrations of the library in use.
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