# Release 6.5

On December 7th, 2004 - we are have released new versions of the HUGIN Graphical User Interface (v6.5) and HUGIN Decision Engine (v6.3).

The main new features of this release are:

- The data mining functionality of the HUGIN Graphical User Interface has been improved with a number of new features.

- Improved support for object-oriented models in the HUGIN Decision Engine and HUGIN Graphical User Interface.

- Various improvements to the HUGIN Graphical User Interface including new features such as network layout, network documentation, table import and export online drag & drop help functionality to name a few.

## Hugin Graphical User Interface v6.5:

The data mining functionality of the HUGIN Graphical User Interface has been improved with a number of new features:

- The Learning Wizard of the HUGIN Graphical User Interface now includes a tool for determining the set of minimal resolutions of ambiguous regions. This tool has been added because the NPC algorithm for learning the structure of a Bayesian network model may produce a set of ambiguous regions indicating structure uncertainties. This tool is very helpful when an ambiguous region includes a large number of edges.

- An algorithm for graph layout has been included in the Learning Wizard. This functionality is particularly useful after structure learning. If the user has installed the program called “dot”, the user interface may be parameterized to use this program instead of its internal algorithm.

- A data analysis tool has been included in the data acquisition step of the Learning Wizard. This tool enables the user to see the values recorded in the data for each variable. This tool is particularly useful when continuous variables are included in the data as it also supports discretization.

Support functionality for object-oriented models in the HUGIN Graphical User Interface has been extended to include a number of new features:

- A new file name suffix (“.oobn”) has been introduced in order to better distinguish network files specifying an object-oriented model from network files specifying a flat model.

- The class of an instance node can easily be replaced by another class with an equivalent interface.

- It is now possible to rotate the interface of an instance node. This functionality may be useful when building time-sliced models.

The HUGIN Graphical User Interface has been extended with a number of features supporting the model development process: * 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: * An arc between two continuous variables can be reversed. * It is possible to perform a node absorption operation on discrete chance nodes. This enables the user to eliminate nodes from a model without changing the underlying probabilistic relations between the remaining nodes of the model. * It is now possible to both import and export tables to flat text files. Table import is particularly useful when a table has been generated using a different tool. * The graph layout algorithm is also available outside the Learning Wizard. * Finally, efforts have been put into improving the stability of the HUGIN Graphical User Interface.

## Hugin Decision Engine v6.3:

The HUGIN Decision Engine has improved support for object-oriented models. The HUGIN Decision Engine has been extended with functionality to replace the class of an instance node with another class with an equivalent interface. In addition, a similar function for replacing a parent of a node with another equivalent parent has been included. This allows the user to substitute classes and parents without loosing the tables of effected nodes.