class_docstr: Evaluator used for global metrics evaluation.
class_docstr_tok: ["Evaluator","used","for","global","metrics","evaluation","."]
code: def __len__(self):
      return self._num_examples_added
  
file_path: scenic/scenic/projects/svvit/metrics.py
imports: from typing import Optional, List, Dict
  import numpy
label_desc: Use image node_id 5 for calling the TruvariGlobalEvaluator obj's underlying member method code with example usage: obj.__len__() and returns: self