code: def _single_layer_M(self, x1norm, x1sum):
      # Not implemented
      return 0
  
file_path: elu-gelu-kernels/code/kernels/nn_kernel_gelu.py
imports: import numpy
  import GPy
  import abc
  from .nn_kernel import NNKernel
label_desc: Use image node_id 3 for calling the NNKernelGelu obj's underlying member method code with example usage: obj._single_layer_M(x1norm, x1sum) and returns: int