class_docstr: Subset of a dataset at specified indices.
class_docstr_tok: ["Subset","of","a","dataset","at","specified","indices","."]
code: def __init__(self, dataset, indices):
      self.dataset = dataset
      self.indices = indices
  
imports: import os
  import sys
  import numpy
  from sklearn.model_selection import StratifiedKFold
  import pgl
  from pgl.utils.logger import log
label_desc: Use image node_id 1 to create a new Subset object from inherited base classes: BaseDataset with example: obj = Subset(dataset, indices)