code: def __call__(self, x):
      return chx.batch_norm(
          x,
          self.gamma,
          self.beta,
          running_mean=self.avg_mean,
          running_var=self.avg_var,
          axis=(0, 2, 3),
      )
  
imports: import numpy
  import chainerx
label_desc: Use image node_id 2 for calling the BatchNormalization obj's underlying member method code with example usage: obj.__call__(x) and returns: chx