Appendix 2.4 Stopping Rule 2.3 Fine Tuning Using the Basic Lvq1 or Lvq2.1 Lvq Pak: a Program Package for the Correct Application of Learning Vector Quantization Algorithms
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The program package is available at the Internet site "cochlea.hut." and will be updated continuously. The indexing of the latest release will always be of the form "lvq pak-X.Y". The instructions below are indexed as in the version lvq pak-1.1, which was released on December 31, 1991. The programs are available in two archive formats, one for the UNIX-environment, the other for MS-DOS, respectively. Both archives contain exactly the same les. These les can be accessed via FTP as follows: 1. Create an FTP connection from wherever you are to machine "cochlea.hut..". The Internet address of this machine is 130.233.168.48, for those who need it. 2. Log in as user "anonymous" with your own e-mail address as password. 3. Change the remote directory to "/pub/lvq pak". 4. At this point the FTP should be able to get a listing of les in this directory with DIR and fetch the ones you want with GET. (The exact FTP commands depend on your local FTP program.) Remember to use the binary transfer mode for compressed les. The LVQ PAK program package includes the following les:-Documentation: README short description of the package and installation instructions document.ps documentation in (c) Postcript format document.ps.Z same as above but compressed document.txt documentation in ASCII format-Source le archives (which contain the documentation, too): lvq p1r1.exe self-extracting MS-DOS archive le lvq pak-1.1.tar UNIX tape archive le lvq pak-1.1.tar.Z same as above but compressed An example of FTP access is given below: unix> ftp cochlea.hut.. Password: ftp> cd /pub/lvq pak ftp> binary ftp> get lvq pak-1.1.tar.Z ftp> quit unix> uncompress lvq pak-1.1.tar.Z unix> tar xvfo lvq pak-1.1.tar 3.3 Test data les The package also contains two data sets, ex1.dat and ex2.dat, which can be used to experiment with the programs. An exemplary procedure is given in the documentation of the package. All data les (input vectors and codebooks) are stored in ASCII format for their easy editing and checking. 3.4 Diagnostics With all the programs, it is possible to set the verbose parameter (-v n), where the value of n determines the amount of diagnostic output the program generates. For the visualization of topological relationships of data and codebook vectors, the monitoring program sammon generates a list of coordinates of points that can be displayed two-dimensionally by any standard graphics program. The two-dimensional Sammon mapping approximates to Euclidean distances of the data space, and thus visualizes …
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