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OpenFst Conventions The OpenFst Libary has various conventions and assumptions about its objects and coding style. Object Conventions 1. The StateIds...

OpenFst Download Release downloads: Current version: openfst 1.6.3.tar.gz (requires C 11) Checksum ( sha1 ): 5c11e6e5fca7b33a58fb40eb8aac8eb05bb29805 Earlier...

OpenFst Library OpenFst Version 1.6.3 is now available for download. OpenFst is a library for constructing, combining, optimizing, and searching weighted finite...

Replace Description This operation performs the dynamic replacement of arcs in one FST with another FST, allowing the definition of FSTs analogous to RTNs. It takes...

Prune Description This operation deletes states and arcs in the input FST that do not belong to a successful path whose weight is no more (w.r.t the natural the natural...

ArcSort Description This operation sorts the arcs in an FST per state. At the C level, the sort order is determined by a function object compare of type Compare...

OpenFst Examples Reading the quick tour first is recommended. That includes a simple example of FST application using either the C template level or the shell...

Topsort Description This operation topologically sorts its input if acyclic, modifying it. Otherwise, the input is unchanged. When sorted, all transitions are from...

Minimize Description This operation performs the minimization of deterministic weighted automata and transducers. If the input FST A is an automaton (acceptor)...

Efficiency By reading the Quick Tour and Conventions and working through the examples, users typically can create correct implementations of applications. What...

OpenFst Python extension This extension exposes the OpenFst scripting API to Python. Like the scripting API, it supports arbitrary arcs and weights. The extension...

OpenFst Authors Principal Contacts: Cyril Allauzen allauzen AT google.com Michael Riley riley AT google.com Contributors: These contributions...

OpenFst README OpenFst Release 1.5.3 OpenFst is a library for constructing, combining, optimizing, and searching weighted finite state transducers (FSTs). REQUIREMENTS...

OpenFst Background Material The following material is provided as background reading about finite state transducers. However, it is not necessary to read this...

OpenFst Advanced Usage Below are a variety of topics covered in greater depth or of more specialized interest than found in the Quick Tour. Reading the Quick...

OpenFst Extensions The following extensions to OpenFst are available. These are built only if the configure flags are provided as below. Also provided are...

FST Web Preferences The following settings are web preferences of the FST web. These preferences overwrite the site level preferences in . and...

Multi Pushdown Transducer Library (MPDTs) The multi pushdown transducer (MPDT) extension extends the Transducer Library extension to allow for multiple stacks. As...

Pushdown Transducer Library (PDTs) This is a push down transducer (PDT) extension of the OpenFst library. A PDT is encoded as an FST, where some transitions are labeled...

OpenFst Quick Tour Below is a brief tutorial on the OpenFst library. After reading this, you may wish to browse the Advanced Usage topic for greater detail...

Concat Description This operation computes the concatenation ( product ) of two FSTs. If A transduces string x to y with weight a and B transduces string...

Determinize Description This operation determinizes a weighted transducer. The result will be an equivalent FST that has the property that no state has two transitions...

Disambiguate Description This operation disambiguates a weighted transducer. The result will be an equivalent FST that has the property that no two successful paths...

ExpectationWeight Times Let x (x1, x2) and y (y1, y2) be two elements of W1 X W2. Then x y (x1 y1, x1 y2 x2 y1). MichaelRiley 19 Oct...

Compilation on MacOS X OpenFst version 1.4 Version 1.4 requires MacOS X 10.8 or later and Xcode 5. No special instructions needed. OpenFst versions 1.0 to 1....

Isomorphic Description This operation determines if two transducers with a certain required determinism have the same states, irrespective of numbering, and the...

RandEquivalent Description This operation test is two FSTs are equivalent by randomly generating N paths alternatively in each of the two FSTs. For each randomly...

Intersect Description This operation computes the intersection (Hadamard product) of two FSAs. Only strings that are in both automata are retained in the result...

ShortestPath Description This operation produces an FST containing the n shortest paths in the input FST. The n shortest paths are the n lowest weight paths...

ShortestDistance Description This operation computes the shortest distance from the initial state to every state (when reverse is false ) or from every state to...

Compose Description This operation computes the composition of two transducers. If A transduces string x to y with weight a and B transduces y to z...

ArcMap Description This operation transforms each arc and final state in the input FST. The transformation is specified by a function object called an arc mapper...

StateMap Description This operation transforms each state in the input FST. The transformation is specified by a function object called a state mapper . For instance...

Equal Description This operation determines if two transducers have the same states with the same numbering and the same transitions with the same labels and weights...

Equivalent Description This operation determines if two epsilon free deterministic weighted acceptors are equivalent, that is if they accept the same strings with...

OpenFst Glossary $ acceptor : An acceptor is a finite automaton where each transition has a label and possibly a weight. In this library, an acceptor is represented...

Encode/Decode Description The Encode operation allows the representation of a weighted transducer as a weighted automaton, an unweighted transducer or an unweighted...

RmEpsilon Description This operation removes epsilon transitions (when both the input and output label are an epsilon) from a transducer. The result will be an equivalent...

FST Weight Requirements A semiring is specified by two binary operations and and two designated elements 0 and 1 with the following properties: : associative...

Push Description This operation produces an equivalent transducer by pushing the weights and/or the labels towards the initial state or toward the final states....

Difference Description This operation computes the difference between two FSAs. Only strings that are in the first automaton but not in second are retained in the...

Last Published Publisher CyrilAllauzen Date 30 Apr 2009 19:29 {PublishContrib}{Dir} /var/www/twiki/pub/publish/ {PublishContrib}{URL} http://mohri lt.cs.nyu...

SLT 2010 Tutorial Introduction Part I: Library Design and Use Part II: Applications Presented at SLT 2010 in Berkeley, California. CyrilAllauzen...

SignedLogWeight Plus Let w1 (s1, x1) and w2 (s2, x2) be two elements of { 1,1} X , . Let z1 s1 e x1 and z2 s2 e x2. Then w1 w2 (sgn(z1 z2),...

OpenFst COPYING Licensed under the Apache License, Version 2.0 (the `License`); you may not use these files except in compliance with the License. You may obtain a...

OpenFst Tutorial Part 0: Introduction Part 1: Algorithms Part 2: Library Use and Design Part 3: Applications Presented at HLT/NAACL 2009 in...

Synchronize Description This operation synchronizes a transducer. The result will be an equivalent FST that has the property that during the traversal of a path,...

RandGen Description This operation randomly generates a set of successful paths in the input FST. The operation relies on an ArcSelector object for randomly selecting...

Relabel Description This operation relabels the input and/or output labels of an FST. The input and/or output relabeling are specified by providing the corresponding...

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