code: def update_state(self, y_true, y_pred, sample_weights):
      pass
  
imports: import numpy
  import pytest
  import tensorflow
  from tensorflow.keras.metrics import MeanAbsoluteError, TrueNegatives, Metric
  from tensorflow_addons.testing.serialization import check_metric_serialization
label_desc: Use image node_id 2 for calling the MyDummyMetric obj's underlying member method code with example usage: obj.update_state(y_true, y_pred, sample_weights) without return types