code: def test_value_forward_shape(self):
      model = rl.Value()
      x = np.ones((2, 3))
      _, _ = model.init(shapes.signature(x))
      y = model(x)
      self.assertEqual(y.shape, (2, 1))
  
file_path: trax/trax/models/rl_test.py
imports: from unittest import mock
  from absl.testing import absltest
  import numpy
  from trax import shapes
  from trax.models import rl
label_desc: Use image node_id 2 for calling the RLTest obj's underlying member method code with example usage: obj.test_value_forward_shape() without return types