question for CNN example: Convolutional neural network for Regression

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huyn jin choi
huyn jin choi 2018-4-20
link for example:https://kr.mathworks.com/help/nnet/examples/train-a-convolutional-neural-network-for-regression.html
I'm using Convolutional neural network for Regression to predict 6 output(In example above the number of output is only 1, the rotation angle of figure).
Training result is pretty bad and i can't figure out why. please help me. I used 10200 data and divided it in ratio 0.7,0.15,0.15 for training, validation, test each.
This is the result.
And this is histogram of 6 outputs.
I think there is some relationship between these skewed output data and bad predicted value but i don't know exactly.

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