code: def __len__(self):
      return len(self.x)
  
file_path: BigDL/python/nano/src/bigdl/nano/deps/neural_compressor/onnx/tensorflow/quantization.py
imports: import numpy
  import tensorflow
  from bigdl.nano.utils.tf import tensors_to_numpy
  from bigdl.nano.deps.onnxruntime.tensorflow.model import KerasONNXRuntimeModel
  from ..quantization import BaseONNXRuntimeQuantization
  from .metric import KerasONNXRuntimeINCMetic
label_desc: Use image node_id 2 for calling the KerasNumpyDataset obj's underlying member method code with example usage: obj.__len__() and returns: len