NOTE THE DIFFERENCE BETWEEN DESIGN AND TRAINING
1. Data Division
DATA = TRAINING + VALIDATION + TESTING + UNSEEN
2. Design
DATA = DESIGN + NONDESIGN
DESIGN = TRAINING + VALIDATION
NONDESIGN = TESTING + UNSEEN
3. Training
DATA = TRAINING + NONTRAINING
NONTRAINING = VALIDATION + TESTING + UNSEEN
4. Training data is used to directly modify weight and bias values. Performance estimates obtained from training data are HIGHLY BIASED because the same data is directly used for both modifications and evaluation.
5. Validation data is used for
a. ValStopping: Stops training when nontraining
validation error increases for m consecutive
epochs. This enhances the network's ability to
generalize to nondesign ( i.e., testing and
unseen) data. The MATLAB default is m = 6.
b. Model ranking: Ranks multiple designs w.r.t.
performance. Performance estimates are SLIGHTLY
BIASED because validation data indirectly
affects design.
6. Testing data is used to obtain UNBIASED ESTIMATES OF NONTRAINING (including UNSEEN) DATA.
Hope this helps.
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Greg
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