code: def forward(self, forward_sequence):
      for func in forward_sequence:
          try:
              self.forward_function(func)
          except:
              index = forward_sequence.index(func)
              print_network_traceback(
                  forward_sequence[max(0, index - 4) : index + 1]
              )
              raise
  
file_path: nnabla/python/test/core/legacy_network.py
imports: from nnabla.logger import logger
  import nnabla.function
label_desc: Use image node_id 4 for calling the Network obj's underlying member method code with example usage: obj.forward(forward_sequence) without return types