code: def forward(self):
      op = core.CreateOperator(
          "Concat",
          self.inputs,
          [self.output, self.split_info],
          **self.args,
      )
      return op
  
file_path: pytorch/benchmarks/operator_benchmark/c2/concat_test.py
imports: import random
  import benchmark_caffe2
  from benchmark_caffe2 import Caffe2BenchmarkBase
  from caffe2.python import core
  import operator_benchmark
label_desc: Use image node_id 2 for calling the ConcatBenchmark obj's underlying member method code with example usage: obj.forward() and returns: op