Pyopenfst

* Fixed PROGRAM_FLAGS documentation string in binaries (1.6.8)
* Fixed handling of symbol tables in EpsNormalize (1.6.8)
* Fixed HashMatcher issues with SetState() and Find() consistency (1.6.8)
* Fixed error reporting when FST arc type unknown (1.6.8)
* The `first_path` option to ShortestPath is now optimal for A* (1.6.7)
* Renames SymbolTable::kNoSymbol to kNoSymbol (1.6.7)
* Exposes PowerMapper to the scripting API (1.6.7)
* Fixes linking of the special SOs (1.6.7)
* Fixes error handling in HashMatcher (1.6.6)
* Adds kShortestDelta for operations dependent on shortest-distance (1.6.6)
* Adds Python methods for (un)pickling and (de)serializing FSTs (1.6.6)
* Adds constructive variants of Invert and Project (1.6.6)
* Increases code sharing in MemoryPool/MemoryArena (1.6.6)
* Improves consistency of matcher FST ownership (1.6.6)
* Adds non-trivial A* estimator class (1.6.6)
* Prevents unreachable code generation in libfstscript (1.6.5)
* Adds move constructors for non-trivial weight types (1.6.5)
* Standardizes method names for tuple weight types (1.6.5)
* Eliminates undefined behavior in weight hashing (1.6.5)
* Optimizes binary search in SortedMatcher (1.6.5)
* Adds SetWeight (1.6.5)
* Fixes typing error in Python FAR reader (1.6.4)
* Removes restriction that Prune argument have commutative weights (1.6.3)
* Improves configuration of CompositeWeight readers and writers (1.6.3)
* Improves accuracy of ShortestDistance summation (1.6.3)
* SetFinal now "moves" its weight argument (1.6.3)
* Exposes ArcIterator and EncodeMapper flags in Python (1.6.3)
* Properly sets return codes in FST binaries (1.6.3)
* Eliminates StringWeight macros (1.6.3)
* Finalizes most virtual method overrides (1.6.2)
* Fixes missing includes of <fst/log.h> (1.6.1)
* Adds float format support to FST drawing (1.6.1)
* Extensive modernization for C++11 style (1.6.0)
* Many classes and constants moved into an internal namespace (1.6.0)
* Adds HashMatcher (1.6.0)
* Adds Member method to SymbolTable (1.6.0)
* Adds the "special" extension and the fstspecial binary; this is similar to
fstconvert but accepts arguments for specifying special labels (phi, rho,
and sigma) of FSTs (1.6.0)
* Exposes allow_negative_label option for Python symbol tables (1.6.0)

* Added p-subsequential determinization (1.5.0)
* Generalized epsilon normalization to non-functional case (1.5.0)
* Added general gallic (plus is union) semiring (1.5.0)
* Added FST compression extension (1.5.0)
* Added Python extension (1.5.0)
* Added multiple pushdown transducer (MPDT) support (1.5.0)
* Fixed Isomorphic function (1.5.0)
* Added final method to matchers (1.5.0)
* Fixed various compiler issues (1.5.0)
* Fixed missing Isomorphic components (1.5.0)
* Added UnionWeight (1.5.0)
* Added InputEpsilonMapper and OutputEpsilonMapper arc mappers (1.5.1)
* Added TrivialComposeFilter for more efficient composition when one
of the arguments is epsilon-free (1.5.1)
* Added properties bits kUnweightedCycles and kWeightedCycles (1.5.1)
* Added missing const qualification to (1.5.1):
- SymbolTableIterator access
- EncodeMapper writing to file
- EncodeMapper SymbolTable access
* Replaced internal custom reference-counting (RefCounter) with
C++11 smart pointers where possible, and fixed associated
reference-counting bugs (1.5.1)
* When calling DeleteStates on a MutableFst with a shared impl, the impl
is set to a new empty impl rather than copying and deleting (1.5.1)
* Prepended `Pdt` to the Expand libraries and classes in the PDT
extension, and prepended `MPdt` to the Expand libraries and classes
in the MPDT extension, so that both can be used in the same compilation
unit (1.5.1)
* Added option to PDT Replace for compiling a strongly-regular RTN into a
bounded-stack PDT (1.5.1)
* Improved symbol table support for PDT Replace, including automatic
generation of parentheses symbols (1.5.1)
* Improvements to scripting API (1.5.1):
- Added methods for FST access and mutation
- Added additional checks for arc/weight compatibility
- WeightClass::One and WeightClass::Zero now require a specified weight
type at time of construction
- Improved VectorFstClass constructors
- Added linear-time check for cyclic dependencies in Replace
- Added EncodeMapperClass, a template-free box for an EncodeMapper
* Improvements to the binaries (1.5.1):
- Fixed no-op --precision flag to fstdraw (1.5.1)
- Fixed no-op --file_list_input flag to farcreate (1.5.1)
* Improvements to the Python extension (1.5.1):
- Added methods for creating an empty mutable FST
- Added methods for FST access via state and arc iteration
- Added FST compilation from arclists (cf. fstcompile)
- Added FST printing and drawing
- Added FarReader and FarWriter classes.
* FarReader's GetFst method now returns a pointer (1.5.2)
* Fixed FSTERROR macro (1.5.2)
* Fixed build flags for dlopen (1.5.2)
* Consolidated Python extension into single module (1.5.2)
* Python add_arc now takes an Arc object (1.5.2)
* Adds optional minimization of non-deterministic FSTs (1.5.3)
* Mutation methods of the Python Fst object now support chaining (1.5.3)
* Scripting API and Python weight objects now support semiring arithmetic
(1.5.3)
* Adds RemoveSymbol method to SymbolTable (1.5.4)
* Prevents underflow when using LogProbArcSelector in random generation
(1.5.4)
* Makes random weight generators a single template class (1.5.4)
* Makes weight Properties constexpr where possible (1.5.4)
* Adds check for error when opening files when compiling strings into FARs
(1.5.4)
* Adds routines for parsing string flags to the scripting API (1.5.4)

* Port to C++11 (1.4.0)
* Disambiguate function added (1.4.0)
* Isomorphic function added (1.4.0)
* Matcher interface augmented with Priority method.
* Special matchers (rho/sigma/phi) can match special symbols
on both input FSTs in composition/intersection provided at each
state pair they only match one side (1.4.0)
* Added ExplicitMatcher to suppress implicit matches (e.g. epsilon
self-loops) (1.4.0)
* Linear{Tagger,Classifier}Fst extensions added (1.4.0).
* Generalized state-reachable to work when input is cyclic (so long as no
final state is in a cycle). This ensures label-reachable (and hence label
lookahead) works with cyclic input (1.4.0)
* Added Condense to build the condensation graph (SCCs condensed to single
states) of an FST (1.4.0).
* Added an option to Reverse to specify whether a super-initial state
should always be created (1.4.0).
* Fixed bugs in FirstCacheStore, PowerWeight, and StringCompiler (1.4.0).
* Changed SymbolTable to use faster data structure (1.4.0).
* Added 'min' disambiguation in determinizaton to keep only the minimum
output in a non-functional transducer when plus=min/max
(flag --disambiguate_output) (1.4.1)
* Compiler issues in linear-fst fixed (1.4.1)

* Support for non-fatal exits on errors: (1.3.1)
- Added FLAGS_fst_error_fatal: FST errors are
fatal if true (default); o.w. return objects flagged as bad:
e.g., FSTs - kError
prop. true, FST weights - not a Member().
- Added kError property bit signifying bad FST
- Added NoWeight() method to FST weight requirements that returns
weight that is not a Member().
* Various improvements to the FAR extensions (1.3.1)
- a single FST is now a FAR type
- FLAGS_initial_symbols: Uses the symbol table from the
first FST in the archive for all entries"
- Input/output to standard input/output for some FAR and arc types
* --with-icu configuration option no longer needed (1.3.1)
* Improved flags usage esp. if use SET_FLAGS not SetFlags/InitFst (1.3.2)
* Added 'fst' as possible far writer type (1.3.2)
* phi matcher can now accept 0 as the phi label (1.3.2)
* Added ngram-fst extension (1.3.2)
* Improved performance of PDT composition (1.3.3)
* Memory-map support (1.3.3)
* Fixed cross-FST serialization issues (1.3.3)
* Fixed NGramFst off-by-one issue (1.3.3)
* farextract now allows one to specify a list of comma-separated keys,
including key ranges (1.3.3)
* Fixed bug in PDT replace that could cause close paren IDs to collide
with open paren IDs (1.3.4)

* Added lookahead matching and filtering for faster composition
* Added EditFst for mutation of o.w. immutable FSTs
* Added script sub-namespace defining type FstClass, a non-templated
Fst<Arc> to hold the arc template type internally. This and FST
operations on it allow easier I/O and scripting at the cost of some
runtime dispatching.
* Added per-arc-iterator control of Fst caching.
* Added PowerWeight and Power Arc.
* Added SparsePowerWeight and SparsePowerArc (1.2.4)
* Added SignedLogWeight and SignedLogArc (1.2.4)
* Added ExpectationWeight and ExpectationArc (1.2.4)
* Added AStarQueue, PruneQueue and NaturalPruneQueue disciplines (1.2.6)
* Added Log64Weight and Log64Arc to FST library throughout, including
support throughout scripts/bins/dsos (1.2.8)
* Added delayed RandGenFst that outputs tree of paths weighted
by count (1.2.8)
* Added fstsymbols shell-level command
* Added total weight removal option to pushing
* Changed methods for symbol table mutation:
use MutableInputSymbols()/MutableOutputSymbols().
* Numerous efficiency improvements esp in composition, replace, and caching
* Made "fstmap" handle semiring conversion by adding "to_std", "to_log"
and "to_log64" as supported 'map_type' arguments (1.2.8).
* Made the destructive implementation of RmEpsilon skip over states
admitting no non-epsilon incoming transition (1.2.8).
* Fixed numerous bugs (1.2 through 1.2.9) including:
- improper types of some approximation deltas
- sub-optimal hashing functions
- issues in internal reuse of shortest distance
- hashing bug in FloatWeight
- bug in shortest path queue
- symbol table checksumming issues
- various C++ standards issues
- Visit() behavior when visitation aborted
- Decode() hash performance bug (1.2.1)
- EditFst::Copy(bool) method when the boolean parameter is true (1.2.7)
- SymbolTable memory leak in Invert() (1.2.8)
- Added escaping of " and \ in labels in fstdraw, needed for dot to
function properly (1.2.8)
- Fixed handling of final weight of start state in fstpush (1.2.8)
- Added FST_LL_FORMAT to fix 64-bit integer printf issues (1.2.9)
- Fixed missing <functional> includes (1.2.9)
- Fixed reused local variable names (1.2.9)
- Fixed passing string by reference in FstDraw args (1.2.9)
* Added extensions directories including:
- finite-state archive (FAR) utilities,
added stlist format supporting writing/reading to/from standard out/in
at the library-level (1.2.8)
- compact fsts
- lookahead fsts
- pushdown transducers (improved in 1.2.1 through 1.2.7).
* Added StateMap/StateMapFst; renamed Map/MapFst to ArcMap/ArcMapFst;
map/MapFst retained (but deprecated) (1.2.9)
* Deleted ArcSum() and ArcMerge; use StateMap w/ ArcSumMapper and
ArcUniqueMapper (1.2.9).
* Incremented version of ConstFst/CompactFsts to stop memory alignment
that fails on pipes. Made old version raises errors when read on
pipes (1.2.9).
* Improved determinize hash (1.2.9)
* Removed stdio uses (1.2.10)
* Fixed library ordering issues esp. with newer GNU build tools (1.2.10)

* Added compat.h to src/include/fst to fix missing defines
* Fixed bug in acyclic minimization that led to non-minimal
(but equivalent) results
* Fixed missing FST typedef in various matchers in matcher.h
so that they can be cascaded
* Opened file streams binary where appropriate

OpenFst: Release 1.0 (Additions to beta version):
* Matcher class added for matching labels at FST states. Includes
special matchers for sigma (any), rho ('rest'), and phi ('fail')
labels.
* Composition generalized with arbitrary filters, matchers, and state
tables.
* Sequence and matching composition filters provided. (see compose.h,
compose-filter.h, matcher.h, state-table.h)
* Unique n-best (see shortest-path.h)
* Pruning in determinization and epsilon removal (see determinize.h,
rmepsilon.h)
* New Fst class:
* Compact Fsts for space-efficient representation (see compact-fst.h)
* New Weight classes:
* MinMax
* Lexicographic
* Miscellaneous bug fixes