Negative fitness in Heuristics Miner

mvilar

Hi!

I am using ProM 6.7 (revision 35885) in order to load an event log in the form of this CSV file. I apply the "Convert CSV to XES" plugin with the default parameters (simply adding Case ID column as Case Column) and then I run the "Mine for a Heuristics Net using Heuristics Miner" with the default parameters. The resulting fitness of the discovered process model is -0.3936: a negative value...

You can see the overall process in this video.

I have no idea what is going on. Any idea?

Thank you!

JBuijs

Hi 'mvilar',

Does the following discussion provide further insights?
https://www.win.tue.nl/promforum/discussion/335/quality-dimentions

I also know that a new version of the heuristics miner is developed, although I'm not sure about the status.

mvilar

Hi Buijs,

Thank you for your answer!

I followed the steps defined in this discussion, specifically:

1. I have converted the heuristics net into a Petri net
2. I have used the 'Replay a Log on Petri Net for Conformance Analysis'

But I have got the following warning:
The initial marking is an empty marking. If this is not intended, remove the currently existing InitialMarkingConnection object and then use "create Initial Marking" plugin to create a non-empty initial marking.

You can see the overall process in this video.

So, as I know what my initial marking is into the resulting Petri net (and the final marking, by the way), I have ran the 'Create Initial Marking' plugin over my Petri net and I have repeated the previous steps, obtaining a fitness of 0.8431 (as you can see in this video).

I think all steps that I ran are correct, aren't they?

So, can we conclude that there is an error calculating the fitness into the 'Mine for a Heuristics Net using Heuristics Miner'? What would be yout opinion?

Thank you so much!

JBuijs

I agree, there is an error in the calculation and your steps seems logical.

mvilar

Thank you!