code: def testGenerateAudioSample(self, batch_size, channels=16):
      audio = np.random.randn(batch_size, 1)
      encoding = np.random.randn(batch_size, channels)
      with tf.Graph().as_default(), self.test_session() as sess:
          net = fastgen.load_fastgen_nsynth(batch_size=batch_size)
          sess.run(tf.global_variables_initializer())
          audio_gen = fastgen.generate_audio_sample(
              sess, net, audio, encoding
          )
          self.assertEqual(audio_gen.shape, audio.shape)
  
file_path: magenta/magenta/models/nsynth/wavenet/fastgen_test.py
imports: import os
  from absl.testing import parameterized
  import librosa
  from magenta.models.nsynth.wavenet import fastgen
  import numpy
  import tensorflow.compat.v1
label_desc: Use image node_id 5 for calling the FastegenTest obj's underlying member method code with example usage: obj.testGenerateAudioSample(batch_size, channels) without return types