code: def __init__(self, df, transform=None):
      self.df = df
      self.transform = transform
  
file_path: BigDL/python/orca/example/learn/pytorch/brainMRI/dataset.py
imports: import numpy
  import random
  import cv2
  import torch
  import torchvision.transforms
  import torch.utils.data
label_desc: Use image node_id 1 to create a new BrainDataset object from inherited base classes: data with example: obj = BrainDataset(df, transform)