code: def test_compute_fans(self):
      fan_in_out1 = initializers._compute_fans([])
      self.assertEqual(fan_in_out1, (1, 1))
      fan_in_out2 = initializers._compute_fans([2])
      self.assertEqual(fan_in_out2, (2, 2))
      fan_in_out3 = initializers._compute_fans([3, 4])
      self.assertEqual(fan_in_out3, (3, 4))
      fan_in_out4 = initializers._compute_fans([1, 2, 3, 4])
      self.assertEqual(fan_in_out4, (6, 8))
      fan_in_out5 = initializers._compute_fans(
          [3, 5, 9], fan_in_axes=[0]
      )
      self.assertEqual(fan_in_out5, (3, 45))
      fan_in_out6 = initializers._compute_fans(
          [3, 5, 7, 4], fan_in_axes=[0, 1]
      )
      self.assertEqual(fan_in_out6, (15, 28))
  
imports: import itertools
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import initializers
  from haiku._src import test_utils
  import jax
  from jax import config
  import jax.numpy
  import numpy
label_desc: Use image node_id 3 for calling the InitializersTest obj's underlying member method code with example usage: obj.test_compute_fans() without return types