code: def hybrid_forward(self, F, x):
      return x / F.sqrt(F.mean(x**2, axis=1, keepdims=True) + 1e-8)
  
imports: import numpy
  from math import sqrt
  import mxnet
  import mxnet.ndarray
  import mxnet.gluon.nn
  from numpy import prod
label_desc: Use image node_id 2 for calling the PixelNorm obj's underlying member method code with example usage: obj.hybrid_forward(F, x) and returns: unknown