code: def test_variance_scaling_invalid_scale(self):
      seed = 1234
  
      with self.assertRaisesRegex(
          ValueError, "Argument `scale` must be positive float."
      ):
          initializers.VarianceScaling(
              scale=-1.0, seed=seed, mode="fan_in"
          )
  
file_path: keras/keras/initializers/random_initializers_test.py
imports: import numpy
  from keras import backend
  from keras import initializers
  from keras import testing
  from keras import utils
label_desc: Use image node_id 6 for calling the InitializersTest obj's underlying member method code with example usage: obj.test_variance_scaling_invalid_scale() without return types