code: def testFanInSum(self, input_shape):
      init_fun, apply_fun = stax.FanInSum
      _CheckShapeAgreement(
          self, init_fun, apply_fun, [input_shape, input_shape]
      )
  
imports: from absl.testing import absltest
  import numpy
  from jax._src import test_util
  from jax import random
  from jax.example_libraries import stax
  from jax import dtypes
  from jax import config
label_desc: Use image node_id 12 for calling the StaxTest obj's underlying member method code with example usage: obj.testFanInSum(input_shape) without return types