New Release - Hugin 6.6
On September 12th, 2005 - we have released new versions of
the HUGIN Graphical User Interface (v6.6) and HUGIN Decision Engine (v6.4).
The main new features of this release
are:
- Improved data mining functionality of the HUGIN
Graphical User Interface.
- Value
of Information analysis on discrete random variables in Bayesian
networks and influence diagrams in both the HUGIN Decision Engine and the
HUGIN Graphical User Interface.
- Improved performance of the HUGIN Decision Engine
with respect to inserting and propagating multiple pieces of hard evidence
in the junction forest.
- HUGIN Decision Engine libraries for Windows
platforms are now provided for Visual Studio .NET 2003 (in addition to
Visual Studio 6.0).
Hugin
Graphical User Interface v6.6:
The Learning Wizard of the HUGIN
Graphical User Interface has been improved with a number of new features:
- The Data Analysis tool of the Learning Wizard shows
a number of statistics on the data analyzed including an indication of the
amount of missing data and the number of distinct values for each variable.
- The Data Dependency window of the Learning Wizard
reports the p-value of an edge when the edge is selected and model size when
the edge is deselected.
- The Structure Uncertainties window of the Learning
Wizard reports the p-value of an edge when the edge is selected.
- The log information generated as part of the
learning process is available to the user for inspection after completing
the Learning Wizard.
The EM
Learning Wizard of the HUGIN Graphical User Interface has been improved with
a number of new features:
- The EM algorithm reports the log-likelihood of the
model given data to the network log after each iteration.
- The log information generated as part of the
learning process is available to the user for inspection after completing
the EM Learning Wizard.
A few features related to the learning
functionality of the HUGIN Graphical User Interface have been included or
improved:
- Better display of the network log information and a
separate usage log window.
- Automatic documentation of models. This feature
enables the user to produce HTML documentation of a network, including the
descriptions included in the network.
- A print preview has been included in the printing
functionality.
- Online help has been improved to support
drag'N'drop.
The HUGIN Graphical User Interface has
been improved with various new features. This includes:
- A line specifying the data file used for structure
learning has been included in the Structure Learning window.
- A line specifying the data file used for parameter
learning has been included in the EM Learning window.
- It is now possible to add experience tables to all
selected discrete chance nodes.
- It is now possible to add fading tables to all
selected discrete chance nodes.
- An invocation of "generate table" is
enforced on all nodes with a model prior to parameter learning using the EM
Learning Wizard. This ensures that the conditional probability table of each
node has been generated form the model and it will be shown in the Prior
Distribution window of the EM Learning Wizard.
- The explicit creation of experience tables for all
discrete chance nodes has been disabled prior to parameter learning using
the EM Learning Wizard. This implies that the user must create experience
tables prior to using the EM Learning Wizard or in the Prior Distributions
step of the EM Learning Wizard.
The HUGIN Graphical User Interface
have been extended with support for value of information analysis on discrete
random variables in Bayesian networks and influence diagrams. Value of
information analysis is based on computing entropy and mutual information on
nodes and pairs of nodes.
The functionality of the HUGIN
Graphical User Interface supporting object-oriented models has been extended to
include a few new features:
- It is no longer a requirement that object-oriented
models are saved with ".oobn" suffix (both .net and .oobn are
supported).
- Improved functionality for saving and loading
object-oriented models with expanded / collapsed instance nodes. If an
instance node is expanded when the model is saved, then the instance node
will be expanded and placed at the same location when the model is loaded
subsequently.
The HUGIN Graphical User Interface has
been improved with various new features. This includes:
- Functionality for loading and saving node
elimination orders in the HUGIN Graphical User Interface. This is very
useful when a good or even optimal triangulation of a network is available
or has been identified.
- Help facilities made available in the "Update
HUGIN" window. Due to strict security policies some users have
experienced problems using the "live update" functionality of the
HUGIN Graphical User Interface. Help facilities have been included in order
to clearly explain how to update the installation in case of problems
performing the "live-update".
- Improved usage log information.
- Probabilities and utilities are shown as
inconsistent when switching from edit mode to run mode on a previously
compiled domain when tables have been updated.
- Using right mouse pop-up menu to change the subtype
of a node to numbered creates a node with states starting at 0 ... (not 1 as
was previously the case).
- The functionality for graph Layout now supports
continuous chance nodes and instance nodes.
Finally, efforts have been put into
improving the stability of the HUGIN Graphical User Interface.
Hugin
Decision Engine v6.4:
The HUGIN Decision Engine has been extended with the following features:
- Functions for computing entropy and mutual
information have been added. These functions are useful for value of
information analysis.
- Direct access to the pseudo-random number generator
implemented in HUGIN Decision Engine is now provided through API functions.
- The EM algorithm reports the log-likelihood of the
model given data to the network log after each iteration.
- Improved performance of the HUGIN Decision Engine
with respect to inserting and propagating multiple pieces of hard evidence
in the junction forest.
Finally, HUGIN Decision Engine
libraries for Windows platforms are now provided for Visual Studio .NET 2003 (in
addition to Visual Studio 6.0).
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