code: def reduce_log_sum(attrs, inputs, proto_obj):
      
      keep_dims = True if 'keepdims' not in attrs else attrs.get('keepdims')
      sum_op = symbol.sum(inputs[0], axis=attrs.get('axes'),
                          keepdims=keep_dims)
      log_sym = symbol.log(sum_op)
      return log_sym, attrs, inputs
docs: Reduce the array along a given axis by log sum value