docstr: Create some common default values for decoder.
docstr_tok: ["Create","some","common","default","values","for","decoder","."]
code: def setUp(self):
      """Create some common default values for decoder."""
      super().setUp()
      # For decoder.
      self.input_keys = ("pw_scaled", "f0_scaled")
      self.output_splits = (("amps", 1), ("harmonic_distribution", 10))
      self.n_batch = 2
      self.n_t = 4
      self.inputs = {
          "pw_scaled": tf.ones([self.n_batch, self.n_t, 1]),
          "f0_scaled": tf.ones([self.n_batch, self.n_t, 1]),
      }
      self.rnn_ch = 3
      self.get_decoder = functools.partial(
          decoders.RnnFcDecoder,
          rnn_channels=self.rnn_ch,
          ch=2,
          layers_per_stack=1,
          input_keys=self.input_keys,
          output_splits=self.output_splits,
          rnn_type="gru",
      )
  
file_path: ddsp/ddsp/training/decoders_test.py
imports: import functools
  from absl.testing import parameterized
  from ddsp.training import decoders
  import numpy
  import tensorflow.compat.v2
label_desc: Use image node_id 1 for calling the RnnFcDecoderTest obj's underlying member method code with example usage: obj.setUp() without return types