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73 lines
3.1 KiB
Plaintext
73 lines
3.1 KiB
Plaintext
4 years ago
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SGT
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===
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The files here contain a C++ class for implementing simple Good-Turing
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re-estimation, as described by Geoff Sampson in the book Empirical Linguistics
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(2001), and on the web at http://www.grsampson.net/RGoodTur.html. The code
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here is a C++ adaptation of the published code by Sampson and Gale, with the
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bug fix issued in 2000. It is encapsulated as a class to allow it to be
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incorporated into other programs. An additional coding change is that the data
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can be presented in any order, whereas the original code required the data to
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be in ascending order.
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Sampson's original code was issued with no restrictions on use. In keeping
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with the spirit of this, the code here is issued under an open source licence
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which allows essentially unrestricted use.
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LICENCE
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-------
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Copyright (c) David Elworthy 2004.
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All rights reserved.
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Redistribution and use in source and binary forms for any purpose, with or
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without modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions, and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions, and the disclaimer that follows
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these conditions in the documentation and/or other materials
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provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Contact details
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---------------
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You may contact me at david@friendlymoose.com. I would be happy to hear of any
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experiences you have with the code; please feel free to send me updated
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versions. The reference site for the code is http://www.friendlymoose.com/.
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Files and use
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-------------
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There are three files:
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sgt.h SGT header file
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sgttest.cpp A test and example program
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There is no source file, as the SGT class is a template over the observation
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type, typically either an int or a double.
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Information about using the class is included in the header file. The code has
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been tested with g++ version 3.2 on cygwin and Microsoft Visual Studio version
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6 on Windows 2000. You can compile and link the test program using g++ using
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the command
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g++ -o sgttest sgttest.cpp
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For Visual Studio, from the command line, you can compile and link with
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cl -GX sgttest.cpp
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Version history
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---------------
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Initial version released January 2004.
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Updated to a better implementation April 2004.
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