code: def subset(self, num_elements, deterministic=True):
      data_map = dict()
      for key in self.data_map:
          data_map[key] = self.data_map[key][:num_elements]
      return Dataset(data_map, deterministic)
  
file_path: baselines/baselines/common/dataset.py
imports: import numpy
label_desc: Use image node_id 5 for calling the Dataset obj's underlying member method code with example usage: obj.subset(num_elements, deterministic) and returns: Dataset