code: def default(self, obj):
      if isinstance(obj, (np.generic, np.ndarray)):
          return obj.tolist()
      # Let the base class default method raise the TypeError
      return json.JSONEncoder.default(self, obj)
  
imports: from torch.utils.data import Dataset
  from torch.utils.data import DataLoader, WeightedRandomSampler
  import torch
  import numpy
  import scipy
  import json
  from sklearn.utils import check_array
  import pandas
  import warnings
label_desc: Use image node_id 1 for calling the ComplexEncoder obj's underlying member method code with example usage: obj.default(obj) and returns: json, obj