class_docstr: Test SlotF1Metric.
class_docstr_tok: ["Test","SlotF1Metric","."]
code: def test_slot_f1_metric_addition(self):
      a = SlotF1Metric(slot_p=1)
      b = SlotF1Metric(slot_r=0)
      c = SlotF1Metric(slot_p=AverageMetric(numer=2, denom=3), slot_r=1)
      d = a + b + c
      # Slot P should be 3/4 = 0.75; slot R should be 1/2 = 0.5
      self.assertEqual(0.6, d.value())
  
file_path: ParlAI/tests/tod/test_tod_teacher_metrics.py
imports: import unittest
  from math import isnan
  from parlai.core.metrics import AverageMetric
  from parlai.core.tod.teacher_metrics import SlotF1Metric, SlotMetrics
label_desc: Use image node_id 2 for calling the TestSlotF1Metric obj's underlying member method code with example usage: obj.test_slot_f1_metric_addition() without return types