docstr: Return output of running the current graph under TF.
docstr_tok: ["Return","output","of","running","the","current","graph","under","TF","."]
code: def RunTfGraph(self):
      """Return output of running the current graph under TF."""
      feature_output = self._session.run(
          self._output, feed_dict={self._input: self._test_waveform}
      )
      return feature_output
  
imports: import tempfile
  from magenta.models.onsets_frames_transcription import melspec_input
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 4 for calling the MelspecInputTest obj's underlying member method code with example usage: obj.RunTfGraph() and returns: feature_output