class_docstr: Evaluator used for tasseo global metrics evaluation.
code: def __len__(self):
      return self._num_examples_added
  
file_path: scenic/scenic/projects/tasseo/train_utils.py
imports: from typing import Any, Dict, List, Optional
  from absl import logging
  import numpy
  import sklearn.metrics
label_desc: Use image node_id 5 for calling the TasseoGlobalEvaluator obj's underlying member method code with example usage: obj.__len__() and returns: self