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Revision 192019-07-18 - MichaelRiley

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OpenGrm SFst Library: Stochastic Finite-State Transducer Library


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Red led OpenGrm SFst Version 1.0.0 is now available for download.
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Red led OpenGrm SFst Version 1.1.0 is now available for download.
 

SFst is a library for normalizing, sampling, combining, and approximating stochastic (or probabilistic) finite-state transducers. These are weighted finite-state transducers, represented in OpenFst library format, that have two properties:

  1. a canonical format that may include epsilon and failure transitions under specified constraints
  2. a normalized weight distribution that assigns a (negative log) probability to each path leaving a state.
An n-gram model produced by the OpenGrm NGram Library is a stochastic FST1 but many other topologies are possible.


1Provided the failure label (phi_label) is specified to match the backoff label, typically 0, of the n-gram model.

 
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