class_docstr: Data Structure for Tensor in Colossal-AI. It is a subclass of torch.Tensor.
  
  It is only used to trigger the torch function hook.
  
  Args:
      data (torch.Tensor): a torch tensor used as the payload the colotensor.
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code: def __deepcopy__(self, memo):
      if id(self) in memo:
          return memo[id(self)]
      else:
          with torch._C.DisableTorchFunction():
              data = self.data.clone()
          tensor = ColoTensor(data)
          memo[id(self)] = tensor
          return tensor
  
file_path: colossalai/colossalai/tensor/colo_tensor.py
imports: from functools import lru_cache
  from typing import Callable, Set
  import torch
label_desc: Use image node_id 3 for calling the ColoTensor obj's underlying member method code with example usage: obj.__deepcopy__(memo) and returns: memo, tensor