code: def __init__(self, **loadmat_kwargs) -> None:
      try:
          import scipy.io as sio
      except ImportError as e:
          raise ModuleNotFoundError(
              "Package `scipy` is required to be installed for mat file."
              "Please use `pip install scipy` or `conda install scipy`"
              "to install the package"
          ) from e
      self.sio = sio
      self.loadmat_kwargs = loadmat_kwargs
  
imports: import io
  import json
  import os.path
  import pickle
  import tempfile
  import torch
  from torch.utils.data.datapipes.utils.common import StreamWrapper
label_desc: Use image node_id 1 to create a new MatHandler object  with example: obj = MatHandler()