NameError: name 'embedding_dim' is not defined

This error message indicates that the variable 'embedding_dim' has not been defined in the current scope. This could be because the variable has not been declared at all, or it could be that it has been declared in a different scope and is not accessible in the current context. To resolve this error, you may need to declare the variable 'embedding_dim' or make sure that it is properly defined and accessible in the current context.