the reference answer GPT ᴼ ᴾ ᴱ ᴺ ᴬ ᴵ < br / > this error usually indicates in the code USES the undefined variable or a module name. In your case, it appears that you are using a variable or module named nn in your code, but this variable or module has not been defined or imported.
If nn is a module name, you may have forgotten to import the module. You can import the module using import statements, such as
import nn
If nn is a variable name, you probably didn't define the variable in your previous code. You need to define the variable first, for example:
nn = 10
If you have imported the nn module and still experience the error, it is possible that there is no variable or class named nn defined in the module. You need to check the module's documentation to see if nn variables or classes exist in the module and modify the code as needed.
In summary, to resolve the error, you need to look for the nn variable or module used in your code and verify that the variable or module has been defined or imported. If it is not defined or imported, you need to define or import it.
