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.TH BAYESOL 1 "Bayesian Classification Tools" "Version @VERSION@" ""
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bayesol \- a Bayes solution calculator for use with dbacl.
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is a Bayes solution calculator designed to combine the output of
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with a prior distribution and a risk specification, and
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calculate the optimal Bayesian decision (which minimizes the posterior
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The risk specification is read from the text file
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and must be written in a simple format described below. The
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output can either be read from FILE or from STDIN.
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returns a positive integer corresponding to the category with the lowest risk.
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See the section RISK SPECIFICATION.
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Fully internationalized mode. Forces the use of wide characters internally,
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which is necessary in some locales. This incurs a noticeable performance penalty.
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Print risk scores for each
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Each score is (approximately) the logarithm of the expected risk under that category. The lowest score (ie closest to -infinity) is best, etc.
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Print recursive risk scores for each
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Each score is (approximately) the logarithm of the best score based on
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the remaining categories, after the previously best scoring categories
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have been removed, and a normalizing factor was added. A full
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description is given in the technical report listed at the end of this
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manpange. The largest score (ie closest to +infinity) is best, etc.
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Verbose mode. Prints to STDOUT the category with minimum posterior risk.
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In case several categories are possible,
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prints the first category in the order in which they appear
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in the categories section of
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Print debug output. Do not use.
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Print the program version number and exit.
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.SH RISK SPECIFICATION
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needs to read a text file
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containing a risk specification. The format of this text file is as follows
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"\fIregex1\fR" \fIc1\fR [
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.IR formula12 , "" ...,
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"\fIregex2\fR" \fIc2\fR [
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.IR formula22 , "" ...,
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"\fIregexM\fR" \fIcM\fR [
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.IR formulaM2 , "" ...,
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are non-negative numbers,
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are (possibly empty) regular expression strings,
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are instances of the category names
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and the formulas are numbers or mathematical expressions.
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Every category which appears in the categories section must appear at least
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once in the loss_matrix section, with an empty "" regular expression.
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To construct the actual loss matrix used in the decision calculations,
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selects, for each category appearing in the categories section,
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the first row whose regular expression is matched
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within FILE or STDIN, or the first row with empty regular expression if there
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Each formula can be either a single number, or an algebraic combination of
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the operators exp(), log(), +, -, *, /, ^ and parentheses (). The string "inf"
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is parsed as the value infinity. Also, the
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string "complexity" is recognized, and converted to the complexity for
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corresponding regular expression contains submatches delimited by parentheses,
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their numerical values can be used inside the formulas as the special variables
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$1, ..., $9. Note that submatches which aren't numerical are converted to the value zero.
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Case is important. Spaces and newlines can be liberally inserted. Comments
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must start with a # and extend to the end of the line.
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is used together with
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An invocation looks like this:
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% dbacl -c one -c two -c three sample.txt -vna | bayesol -c toy.risk -v
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See @PKGDATADIR@/doc/costs.ps for a description of the algorithm used.
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@PKGDATADIR@/doc/tutorial.html for a more detailed overview.
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The source code for the latest version of this program is available at the
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http://www.lbreyer.com/gpl.html
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http://dbacl.sourceforge.net
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Laird A. Breyer <laird@lbreyer.com>
added
removed
man/bayesol.1in
