code: def test_alpha_dropout_correctness(self):
      inputs = np.ones((20, 500)).astype("float32")
      layer = layers.AlphaDropout(0.3, seed=1337)
      outputs = layer(inputs, training=True)
      self.assertAllClose(
          np.std(backend.convert_to_numpy(outputs)), 1.0, atol=1e-1
      )
  
file_path: keras/keras/layers/regularization/alpha_dropout_test.py
imports: import numpy
  import pytest
  from keras import backend
  from keras import layers
  from keras import testing
label_desc: Use image node_id 2 for calling the AlphaDropoutTest obj's underlying member method code with example usage: obj.test_alpha_dropout_correctness() without return types