In genetic programming, the measure of Fitness in negative values denote what?

10 October 2019 0 6K Report

I am working on a GP problem with an experimental data set. I have three input and one output channel. After the evaluation, the predicted model is given and the following appears -

Fitness: -63.28....

RMSE: 0.013569.....

Complexity: 3.799999....

I am not sure what to interpret from this. The fitness value is -63.28 , I am concerned with the negative sign. What does it mean? Is it a good model or a bad model? Kindly help...

I am also posting the graph generated.

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