code: def forward(self, x):
      x = torch.addmm(x, x, x, alpha=self.alpha, beta=self.beta)
      return x
  
imports: import pytest
  import torch
  from packaging import version
  from torch.utils.checkpoint import checkpoint
  from colossalai.testing.utils import clear_cache_before_run, parameterize
label_desc: Use image node_id 2 for calling the AddmmModel obj's underlying member method code with example usage: obj.forward(x) and returns: x