snsv.txt

一种新颖的SVM算法

SN data file format conversion utility
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Included in the RHUL SV machine distribution is a utility program 
called "snsv" which converts the SN data file format for PATTERN 
RECOGNITION PROBLEMS ONLY into our own data file format. For details 
on the exact format of SN files see "sv/docs/snsv/sn-format.txt"
and for details of our file format see "sv/docs/intro/sv_user.tex" or 
for a more detailed description, "sv/docs/sample_list/sample_list_file_format.txt".

The utility program is called in the following way:

snsv <sn data file> <sn truth data file> <output data file>

The first argument is the name of the data file in sn format 
(binary, ascii or packed) and the second the sn data file containing
the truth values (classifications) of the vectors described in 
the data file. The third argument is the name of the output file.

The program has the following menu options:

(1) Single class versus other classes ; or
(2) All classes

Option (1) takes the data and truth files and creates a binary classified
data file. Examples from a single class (which you specify) are
labelled as the positive examples, and all other classes are negative 
examples. This is useful when you have multi-class pattern recognition data, 
and you wish to learn a one-against-the-rest classifier.

Option (2) just saves the class data out as is. If there are more than two 
classes this data file can only be used with a multi-class SV machine.

Finally you are asked whether you wish the output to be in binary or ascii.
Binary offers faster loading times and smaller file sizes, however ascii
can be useful for debugging or analysing your data with an editor. All the 
SV programs automatically detect the format (binary or ascii) of data files.