code: def test_scalar_mix_throws_error_on_incorrect_initial_scalar_parameters_length(
      self,
  ):
      with pytest.raises(ConfigurationError):
          ScalarMix(3, initial_scalar_parameters=[0.0, 0.0])
  
file_path: allennlp/tests/modules/scalar_mix_test.py
imports: import torch
  import pytest
  import numpy
  from allennlp.common.testing import AllenNlpTestCase
  from allennlp.common.checks import ConfigurationError
  from allennlp.modules import ScalarMix
  from allennlp.nn import util
label_desc: Use image node_id 3 for calling the TestScalarMix obj's underlying member method code with example usage: obj.test_scalar_mix_throws_error_on_incorrect_initial_scalar_parameters_length() without return types