code: def torch_unsqueeze(input, dim):
      shape = list(input.shape)
      if dim < 0:
          dim = input.dim() + 1 + dim
      shape.insert(dim, 1)
      return torch.empty(shape, device="meta")
  
file_path: colossalai/colossalai/fx/tracer/meta_patch/patched_function/torch_ops.py
imports: import torch
  from ...registry import meta_patched_function
label_desc: Use image node_id 9 for calling a global function with example usage: torch_unsqueeze(input, dim) and returns: torch