code: def torch_var_mean(
      input, dim, unbiased=True, keepdim=False, *, out=None
  ):
      assert out is None, "saving to out is not supported yet"
      var = torch.empty(1).squeeze(0).to("meta")
      mean = torch.empty(1).squeeze(0).to("meta")
      return var, mean
  
file_path: ColossalAI/colossalai/fx/tracer/meta_patch/patched_function/arithmetic.py
imports: import torch
  from ...registry import meta_patched_function
label_desc: Use image node_id 7 for calling a global function with example usage: torch_var_mean(input, dim, unbiased, keepdim) and returns: var,  mean