code: def metric(self, l):
      # Use Java API directly
      import java.lang.Math as math
  
      return math.sqrt(l[0] / l[1])
  
imports: import h2o
  from .None import locate
label_desc: Use image node_id 3 for calling the CustomRmseFunc obj's underlying member method code with example usage: obj.metric(l) and returns: math