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Topic: NEURAL NETWORK I/O SCALING WARNING/ADVICE
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Greg Heath

Posts: 6,387
Registered: 12/7/04
NEURAL NETWORK I/O SCALING WARNING/ADVICE
Posted: Jul 31, 2017 10:34 AM
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NEURAL NETWORK I/O SCALING WARNING/ADVICE

The reason for this post is I had trouble diagnosing a client's problem until I realized the following:

1. MATLAB NNs have NINE (9) available scaling options:

2. Both input and output have 3 scaling options
a. MAPMINMAX [ -1 1 ] Default
b. MAPSTD zero-mean/unit-variance
c. NONE

3. NNs are NONLINEAR. Therefore,

The data scale of the user MUST BE THE SAME AS THE SCALE OF THE DESIGNER

4. For example, if the designer uses the default MAPMINMAX
a. Users MUST NOT PRESCALE their data using MAPMINMAX!
b. Their input data must have the SAME scale as the designers input data

Have a good day!!!

Greg




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