code: def callback(recognizer, audio):
      # received audio data, now we'll recognize it using Google Speech Recognition
      try:
          # for testing purposes, we're just using the default API key
          # to use another API key, use `r.recognize_google(audio, key="GOOGLE_SPEECH_RECOGNITION_API_KEY")`
          # instead of `r.recognize_google(audio)`
          print(
              "Google Speech Recognition thinks you said "
              + recognizer.recognize_google(audio)
          )
      except sr.UnknownValueError:
          print("Google Speech Recognition could not understand audio")
      except sr.RequestError as e:
          print(
              "Could not request results from Google Speech Recognition service; {0}".format(
                  e
              )
          )
  
label_desc: Use image node_id 1 for calling a global function with example usage: callback(recognizer, audio) without return types