Neural network validation checks net.TrainParam.max_fail <- is a bigger or a smaller number better?

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NightStalker
NightStalker 2021-9-16
回答： pathakunta 2024-1-26
While trying to improve my neural network I wondered, whether I should increase or decrease
TrainParam.max_fail
(default value is 6)
This documentary (https://de.mathworks.com/help/deeplearning/ref/trainlm.html) says:
Training stops when any of these conditions occurs:
  • "Validation performance has increased more than max_fail times since the last time it decreased (when using validation)."
which I interpret as: if validation error decreases more than 6 times -> early stopping
This documentary (https://de.mathworks.com/help/deeplearning/ug/improve-neural-network-generalization-and-avoid-overfitting.html) says:
When the validation error increases for a specified number of iterations (net.trainParam.max_fail), the training is stopped, and the
weights and biases at the minimum of the validation error are returned.
which I interpret as: if validation error increases more than 6 times -> early stopping
So what is the purpose of the net.TrainParam.max_fail?
____________________________________________________________________________________
Second question in the same post:
When my Trainratio/Validationratio/Testratio is 70/25/5.
After how many Train-epochs is there an Validation-Epoch?
Thank you very much in advance!

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采纳的回答

Anshika Chaurasia
Anshika Chaurasia 2021-10-8
Hi,
1. Training stops when any of these conditions occurs:
  • "Validation performance has increased more than max_fail times since the last time it decreased (when using validation)."
In above lines, "Validation Performance" means validation error. Hence, the interpretation of above line will be:
if validation error increases more than 6 times -> early stopping
To understand the terminology refer to following documents:
Calculate network performance - MATLAB perform (mathworks.com)
https://www.mathworks.com/help/deeplearning/ug/neural-network-object-properties.html#bss4hk6-52
2. After each training epoch validation will occur. Or, in an epoch first training will be done then validation.
  1 个评论
NightStalker
NightStalker 2021-10-21
编辑：NightStalker 2021-10-21
Hi Anshika Chaurasia,
this was the very solution to my first question. Thank you!
Your answer to my second question lead to more questions, which I really hope you can answer me:
2.a) What will happen, if the testset has 1000 samples but the validationset only 500? will the validation-procedures be evenly distributed over the test-procedures or will some validation samples be used more than 1 time and force the validation-procedure after every test-procedure?
2.b) After one test-procedure, how does MATLAB pick/choose the sample within the validationset to validate this test-procedure?
Thanks in advance!

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更多回答（3 个）

pathakunta
pathakunta 2024-1-26
1. Training stops when any of these conditions occurs: "Validation performance has increased more than max_fail times since the last time it decreased (when using validation)." In above lines, "Validation Performance" means validation error. Hence, the interpretation of above line will be: if validation error increases more than 6 times -> early stopping To understand the terminology refer to following documents: Calculate network performance - MATLAB perform (mathworks.com) https://www.mathworks.com/help/deeplearning/ug/neural-network-object-properties.html#bss4hk6-52 2. After each training epoch validation will occur. Or, in an epoch first training will be done then validation.
pathakunta
pathakunta 2024-1-26
1. Training stops when any of these conditions occurs: "Validation performance has increased more than max_fail times since the last time it decreased (when using validation)." In above lines, "Validation Performance" means validation error. Hence, the interpretation of above line will be: if validation error increases more than 6 times -> early stopping To understand the terminology refer to following documents: Calculate network performance - MATLAB perform (mathworks.com) https://www.mathworks.com/help/deeplearning/ug/neural-network-object-properties.html#bss4hk6-52 2. After each training epoch validation will occur. Or, in an epoch first training will be done then validation.
pathakunta
pathakunta 2024-1-26
1. Training stops when any of these conditions occurs: "Validation performance has increased more than max_fail times since the last time it decreased (when using validation)." In above lines, "Validation Performance" means validation error. Hence, the interpretation of above line will be: if validation error increases more than 6 times -> early stopping To understand the terminology refer to following documents: Calculate network performance - MATLAB perform (mathworks.com) https://www.mathworks.com/help/deeplearning/ug/neural-network-object-properties.html#bss4hk6-52 2. After each training epoch validation will occur. Or, in an epoch first training will be done then validation.

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