Re: [Fwd: Re: [Databionic-ESOM-User] ESOM]

[<fa...@in...>]

> @fabian could you please set the reply-to headers for the list?

done

> Katerina Mitrokotsa wrote:
> 
>>I have recently tried to use ESOm and although I have found it really
>>interesting I can't understand if there is a way to inspect neuron values
>>Does this tool permit us to see which samples of data correspond to
>>which neuron?
> 
> 
> You can select the samples in the Data tab at the bottom, which are then
> highlighted.

addition: you can also select neurons in the map with the data mouse
(activate the leftmost icon in the toolbar). the data points assigned to
these neurons will be displayed in the data tab at the bottom. you can
also load a *.names file with text labels for the data points. these
will be displayed in the last columns of the data table.

>>Furthermore which is the procedure in order to use a dataset for
>>training and then another dataset for testing.
> 
> To do this you have to add classmasks to your ESOM and then use the
> Project tool to see if the test set is projected into the correct
> classes. The prosses isn't automated as far as i know (fabian?)

creating the class masks is manual (in cvs there is some semi-automated
support with flood filling already). projection is automated and can be
run via the menu or the command line. short summary:

- create two seperate *.lrn for training and test data
- train ESOM with training data
- optional: load *.cls with known classification of training data
- identify clusters and create class mask (also *.cls)
- load *.lrn with test data
- project this data on ESOM
- save newly created *.cls for test data
- optional: analyze *.cls for test data, e.g. compare to *.cls with
known classification of test data.

we offer no tools for the last step which is rather easy however. i
could post some matlab code, if you wish.

bye
fabian