code: def test_l2_loss_vector(self):
      l2_loss = self.variant(losses.l2_loss)
      # Test output.
      np.testing.assert_allclose(l2_loss(self.xs), self.ys)
  
imports: import functools
  from absl.testing import absltest
  from absl.testing import parameterized
  import chex
  import jax
  import jax.numpy
  import numpy
  from rlax._src import losses
label_desc: Use image node_id 3 for calling the L2LossTest obj's underlying member method code with example usage: obj.test_l2_loss_vector() without return types