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<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="stylesheet.xsl"?>
<doc>
<title>Bayesian Networks</title>
<!-- ************************************************************************* -->
<body>
<p>
This page documents all the tools within the dlib library that relate
to the construction and evaluation of Bayesian networks. If you want
a quick introduction to the tools then you should consult the
Bayesian Net <a href="bayes_net_ex.cpp.html">example program</a>.
</p>
<p>
The
library also comes with a graphical application to assist in the
creation of bayesian networks. This application is one of the
<a href="bayes_net_gui_ex.cpp.html">example programs</a>, so to use it
you have to compile it yourself.
</p>
</body>
<!-- ************************************************************************* -->
<menu width="150">
<top>
<section>
<name>Tools</name>
<item>assignment</item>
<item>joint_probability_table</item>
<item>conditional_probability_table</item>
<item>bayes_node</item>
<item>bayesian_network_gibbs_sampler</item>
<item>bayesian_network_join_tree</item>
</section>
<section>
<name>Node Utilities</name>
<item>set_node_value</item>
<item>node_value</item>
<item>node_is_evidence</item>
<item>set_node_as_evidence</item>
<item>set_node_as_nonevidence</item>
<item>set_node_num_values</item>
<item>node_num_values</item>
<item>node_probability</item>
<item>set_node_probability</item>
<item>node_first_parent_assignment</item>
<item>node_next_parent_assignment</item>
<item>node_cpt_filled_out</item>
</section>
</top>
</menu>
<!-- ************************************************************************* -->
<!-- ************************************************************************* -->
<!-- ************************************************************************* -->
<components>
<!-- ************************************************************************* -->
<component>
<name>bayesian_network_join_tree</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object represents an implementation of the join tree algorithm
(a.k.a. the junction tree algorithm)
for inference in bayesian networks.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
<example>bayes_net_gui_ex.cpp.html</example>
<example>bayes_net_from_disk_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>bayesian_network_gibbs_sampler</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object performs Markov Chain Monte Carlo sampling of a bayesian
network using the Gibbs sampling technique.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>bayes_node</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object represents a node in a bayesian network. It is
intended to be used inside the <a href="containers.html#directed_graph">directed_graph</a> object to
represent bayesian networks.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
<example>bayes_net_gui_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>conditional_probability_table</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object represents a conditional probability table.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>joint_probability_table</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object represents a joint probability table.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>assignment</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This object models an assignment of random variables to particular values.
It is used with the <a href="#joint_probability_table">joint_probability_table</a> and
<a href="#conditional_probability_table">conditional_probability_table</a>
objects to represent assignments of various random variables to actual values.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
<example>bayes_net_gui_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>set_node_probability</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily set the probability of a
<a href="#bayes_node">bayes_node</a> given its parents when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_first_parent_assignment</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily obtain an <a href="#assignment">assignment</a>
that contains all the parents of a node in a bayesian network.
</description>
<examples>
<example>bayes_net_gui_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_next_parent_assignment</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily loop through all the parent <a href="#assignment">assignments</a>
of a node in a bayesian network.
</description>
<examples>
<example>bayes_net_gui_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_cpt_filled_out</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily verify that a node
in a bayesian network has its <a href="#conditional_probability_table">conditional_probability_table</a>
completely filled out.
</description>
<examples>
<example>bayes_net_gui_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_probability</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily obtain the probability of a
<a href="#bayes_node">bayes_node</a> given its parents when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_num_values</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily obtain the number of values of a
<a href="#bayes_node">bayes_node</a> when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>set_node_num_values</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily set the number of values of a
<a href="#bayes_node">bayes_node</a> when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>set_node_as_nonevidence</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily remove the evidence flag of a
<a href="#bayes_node">bayes_node</a> when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>set_node_as_evidence</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily set the evidence flag of a
<a href="#bayes_node">bayes_node</a> when it is inside
a <a href="containers.html#directed_graph">directed_graph</a> object.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_is_evidence</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily determine if a
<a href="#bayes_node">bayes_node</a> is evidence when it is inside
a <a href="containers.html#directed_graph"> directed_graph</a> object.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>node_value</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily obtain the value of a
<a href="#bayes_node">bayes_node</a> when it is inside a <a href="containers.html#directed_graph">
directed_graph</a> object.
</description>
</component>
<!-- ************************************************************************* -->
<component>
<name>set_node_value</name>
<file>dlib/bayes_utils.h</file>
<spec_file link="true">dlib/bayes_utils/bayes_utils_abstract.h</spec_file>
<description>
This is a function declared in the dlib::bayes_node_utils namespace. It
is a convenience function that allows you to easily modify the value of a
<a href="#bayes_node">bayes_node</a> when it is inside a <a href="containers.html#directed_graph">
directed_graph</a> object.
</description>
<examples>
<example>bayes_net_ex.cpp.html</example>
</examples>
</component>
<!-- ************************************************************************* -->
</components>
<!-- ************************************************************************* -->
</doc>
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