code: def sum(self, l):
      result = 0.0
      noisefloor = 0.003
      for i in range(len(l)):
          if fabs(l[i]) > noisefloor:
              result += l[i]
      return self.round(result)
  
imports: from essentia_test import *
  from numpy import fabs
label_desc: Use image node_id 9 for calling the TestMonoLoader obj's underlying member method code with example usage: obj.sum(l) and returns: self