code: def get_metric(self):
      return Metric("val_loss")
  
imports: import unittest
  from small_text.training.early_stopping import EarlyStopping, NoopEarlyStopping, EarlyStoppingAndCondition, EarlyStoppingOrCondition
  from small_text.training.metrics import Metric
label_desc: Use image node_id 1 for calling the EarlyStoppingValLossTest obj's underlying member method code with example usage: obj.get_metric() and returns: Metric