code: def read_calibration_cache(self):
      return None
  
file_path: nebuly/optimization/nebullvm/nebullvm/operations/optimizations/compilers/quantizations/tensor_rt.py
imports: from typing import List, Tuple
  import numpy
  from nebullvm.core.models import QuantizationType, ModelParams
  from nebullvm.optional_modules.tensor_rt import tensorrt, IInt8EntropyCalibrator2, polygraphy
  from nebullvm.tools.transformations import MultiStageTransformation
label_desc: Use image node_id 4 for calling the TensorRTCalibrator obj's underlying member method code with example usage: obj.read_calibration_cache() and returns: None