CAUTION! Learning has a problem. Accuracy is not 100%.

Message

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!! CAUTION!  Learning has a problem. Accuracy is not 100%.          !!
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Cause

Indicates that the accuracy did not reach 100% as a result of training with CreateML.

Solution

nan

Reboot you machine if you see nan in PRECISION RECALL section.

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Number of examples: 16
Number of classes: 2
Accuracy: 50.00%

******CONFUSION MATRIX******
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True\Pred [OFF] [ON]  
[OFF]     8     0     
[ON]      8     0     

******PRECISION RECALL******
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Class Precision(%) Recall(%)
[OFF] 50.00           100.00         
[ON]  nan             0.00            

Insufficient training data

Try to provide sufficient amount of training data.

Link