class_docstr: Api for metadata storage.
docstr: Return best k trials so far.
code: def get_best_k(self, trials=None, k=1, valid_only=False):
      """Return best k trials so far."""
  
file_path: model_search/model_search/metadata/metadata.py
imports: import abc
label_desc: Use image node_id 5 for calling the MetaData obj's underlying member method code with example usage: obj.get_best_k(trials, k, valid_only) without return types