code: def test_all_bidirectional(self):
      ComposeEncoder(
          [
              MockSeq2SeqEncoder(
                  input_dim=9, output_dim=5, bidirectional=True
              ),
              MockSeq2SeqEncoder(
                  input_dim=5, output_dim=2, bidirectional=True
              ),
          ]
      )
  
imports: import torch
  import numpy
  import pytest
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.modules.seq2seq_encoders import ComposeEncoder, FeedForwardEncoder, Seq2SeqEncoder
  from allennlp.modules import FeedForward
label_desc: Use image node_id 8 for calling the TestPassThroughEncoder obj's underlying member method code with example usage: obj.test_all_bidirectional() without return types