# FreeBSD Manual Pages

BAYESOL(1) BAYESOL(1)NAMEbayesol - a Bayes solution calculator for use with dbacl.SYNOPSISbayesol[-DVNniv] -criskspec[FILE]...bayesol-VDESCRIPTIONbayesolis a Bayes solution calculator designed to combine the output ofdbacl(1) with a prior distribution and a risk specification, and calculate the optimal Bayesian decision (which minimizes the posterior risk). The risk specification is read from the text fileriskspecand must be written in a simple format described below. Thedbacl(1) output can ei- ther be read from FILE or from STDIN.EXIT STATUSOn success,bayesolreturns a positive integer corresponding to the category with the lowest risk. In case of a problem,bayesolreturns zero.OPTIONS-c Classify usingriskspec. See the section RISK SPECIFICATION. -i Fully internationalized mode. Forces the use of wide characters internally, which is necessary in some locales. This incurs a noticeable performance penalty. -n Print risk scores for eachcategory. Each score is (approxi- mately) the logarithm of the expected risk under that category. The lowest score (ie closest to -infinity) is best, etc. -N Print recursive risk scores for eachcategory. Each score is (approximately) the logarithm of the best score based on the re- maining categories, after the previously best scoring categories have been removed, and a normalizing factor was added. A full description is given in the technical report listed at the end of this manpange. The largest score (ie closest to +infinity) is best, etc. -v Verbose mode. Prints to STDOUT the category with minimum poste- rior risk. In case several categories are possible, prints the first category in the order in which they appear in the cate- gories section ofriskpspec. -D Print debug output. Do not use. -V Print the program version number and exit.RISK SPECIFICATIONbayesolneeds to read a text fileriskspeccontaining a risk specifica- tion. The format of this text file is as follows categories {cat1,cat2,...,catN} prior {p1,p2,...,pN} loss_matrix { "regex1"c1[formula11,formula12,...,formula1N] "regex2"c2[formula21,formula22,...,formula2N] . . "regexM"cM[formulaM1,formulaM2,...,formulaMN] } In the above,cat1,cat2,...,catN, are category names,p1,p2,...,pN, are non-negative numbers,regex1,regex2,...,regexM, are (possibly empty) regular expression strings,c1,c2,...,cM, are instances of the category namescat1,cat2,...,catN, and the formulas are numbers or mathematical expressions. Every category which appears in the categories section must appear at least once in the loss_matrix section, with an empty "" regular expres- sion. To construct the actual loss matrix used in the decision calcu- lations,bayesolselects, for each category appearing in the categories section, the first row whose regular expression is matched within FILE or STDIN, or the first row with empty regular expression if there are no matches. Each formula can be either a single number, or an algebraic combination of the operators exp(), log(), +, -, *, /, ^ and parentheses (). The string "inf" is parsed as the value infinity. Also, the string "com- plexity" is recognized, and converted to the complexity for that cate- gory as reported bydbacl(1). Finally, if the corresponding regular expression contains submatches delimited by parentheses, their numeri- cal values can be used inside the formulas as the special variables $1, ..., $9. Note that submatches which aren't numerical are converted to the value zero. Case is important. Spaces and newlines can be liberally inserted. Com- ments must start with a # and extend to the end of the line.USAGETypically,bayesolis used together withdbacl(1). An invocation looks like this: % dbacl -c one -c two -c three sample.txt -vna | bayesol -c toy.risk -v See /usr/local/share/dbacl/doc/costs.ps for a description of the algo- rithm used. See also /usr/local/share/dbacl/doc/tutorial.html for a more detailed overview.SOURCEThe source code for the latest version of this program is available at the following locations: http://www.lbreyer.com/gpl.html http://dbacl.sourceforge.netAUTHORLaird A. Breyer <laird@lbreyer.com>SEE ALSOdbacl(1),mailcross(1),mailfoot(1),mailinspect(1),mailtoe(1),regex(7) Version 1.14.1 Bayesian Classification Tools BAYESOL(1)

NAME | SYNOPSIS | DESCRIPTION | EXIT STATUS | OPTIONS | RISK SPECIFICATION | USAGE | SOURCE | AUTHOR | SEE ALSO

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