code: def forward(self, x):
      return self.conv2(F.relu(self.conv1(x)))
  
file_path: mmdetection/tests/test_engine/test_schedulers/test_quadratic_warmup.py
imports: from unittest import TestCase
  import torch
  import torch.nn.functional
  import torch.optim
  from mmengine.optim.scheduler import _ParamScheduler
  from mmengine.testing import assert_allclose
  from mmdet.engine.schedulers import QuadraticWarmupLR, QuadraticWarmupMomentum, QuadraticWarmupParamScheduler
label_desc: Use image node_id 2 for calling the ToyModel obj's underlying member method code with example usage: obj.forward(x) and returns: self