docstr: Create some dummy input data for the chain.
docstr_tok: ["Create","some","dummy","input","data","for","the","chain","."]
code: def setUp(self):
      """Create some dummy input data for the chain."""
      super().setUp()
      # Create inputs.
      self.n_batch = 4
      self.n_frames = 1000
      self.n_time = 64000
      rand_signal = lambda ch: np.random.randn(
          self.n_batch, self.n_frames, ch
      )
      self.nn_outputs = {
          "amps": rand_signal(1),
          "harmonic_distribution": rand_signal(99),
          "magnitudes": rand_signal(256),
          "f0_hz": 200 + rand_signal(1),
          "target_audio": np.random.randn(self.n_batch, self.n_time),
      }
  
      # Create Processors.
      harmonic = synths.Harmonic(name="harmonic")
      noise = synths.FilteredNoise(name="noise")
      add = processors.Add(name="add")
      reverb = effects.Reverb(trainable=True, name="reverb")
  
      # Create DAG for testing.
      self.dag = [
          (harmonic, ["amps", "harmonic_distribution", "f0_hz"]),
          (noise, ["magnitudes"]),
          (add, ["noise/signal", "harmonic/signal"]),
          (reverb, ["add/signal"]),
      ]
      self.expected_outputs = [
          "amps",
          "harmonic_distribution",
          "magnitudes",
          "f0_hz",
          "target_audio",
          "harmonic/signal",
          "harmonic/controls/amplitudes",
          "harmonic/controls/harmonic_distribution",
          "harmonic/controls/f0_hz",
          "noise/signal",
          "noise/controls/magnitudes",
          "add/signal",
          "reverb/signal",
          "reverb/controls/ir",
          "out/signal",
      ]
  
file_path: ddsp/ddsp/processors_test.py
imports: from absl.testing import parameterized
  from ddsp import core
  from ddsp import effects
  from ddsp import processors
  from ddsp import synths
  import numpy
  import tensorflow.compat.v2
label_desc: Use image node_id 1 for calling the ProcessorGroupTest obj's underlying member method code with example usage: obj.setUp() without return types