NaN issue when using ptcolor

[qcsui]

Hi, I have been using your ptcolor for doing backpropagation. However, I notice some NaN issue. Maybe it was due to the DeltaE function used.

Did you encounter the same problem as well? Because I found some code related to catch this error.

[dros1986]

Hi qcsui, in previous versions we had this problem and then we solved it. Can you please show us a piece of code that makes it go NaN and/or describe your training setup?

Thank you