class_docstr: Base class for strategies to select representations.
  
  This base class handles sample and update frequencies, as well as logging
  selection statistics to TensorBoard. Sub-classes should implement _select()
  and _update().
docstr: See update().
docstr_tok: ["See","update","(",")","."]
code: def _update(self, epoch, validation_losses):
      """See update()."""
      raise NotImplementedError
  
imports: import gin
  import tensorflow.compat.v2
label_desc: Use image node_id 6 for calling the SelectionStrategy obj's underlying member method code with example usage: obj._update(epoch, validation_losses) without return types