code: def forward(self, x: torch.Tensor):
      return torch.sum(self.conv1(x), dim=1) + torch.sum(
          self.conv2(x), dim=1
      )
  
file_path: nni/test/algo/compression/pruning/test_channel_dependency.py
imports: import pytest
  import torch
  from nni.common.concrete_trace_utils import concrete_trace
  from nni.compression.speedup.dependency import build_channel_dependency
label_desc: Use image node_id 2 for calling the PatternC obj's underlying member method code with example usage: obj.forward(x) and returns: unknown