code: def setUp(self):
      super().setUp()
      self._test_waveform = self.MakeTestWaveform()
      # Initialize TensorFlow.
      self._graph = tf.Graph()
      self._session = tf.Session(graph=self._graph)
  
imports: import tempfile
  from magenta.models.onsets_frames_transcription import melspec_input
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 6 for calling the MelspecInputTest obj's underlying member method code with example usage: obj.setUp() without return types