code: def AttentionBlock_forward(self, x):
      return checkpoint(self._forward, x)
  
imports: from torch.utils.checkpoint import checkpoint
  import ldm.modules.attention
  import ldm.modules.diffusionmodules.openaimodel
label_desc: Use image node_id 2 for calling a global function with example usage: AttentionBlock_forward(x) and returns: checkpoint