code: def valid_dataset(self):
      return MinutelyDataset(
          self.dates[-self.validation_dates :],
          self.packets[-self.validation_dates :],
      )
  
file_path: labml/samples/stocks/dataset.py
imports: import numpy
  import torch
  from labml import monit, lab
  from labml import tracker
  from torch.utils.data import Dataset
  from stocks import CandleIdx
  from stocks.build_numpy_cache import build_cache
label_desc: Use image node_id 3 for calling the MinutelyData obj's underlying member method code with example usage: obj.valid_dataset() and returns: MinutelyDataset