code: def test_config():
      bce_obj = focal_loss.SigmoidFocalCrossEntropy(
          reduction=tf.keras.losses.Reduction.NONE,
          name="sigmoid_focal_crossentropy",
      )
      assert bce_obj.name == "sigmoid_focal_crossentropy"
      assert bce_obj.reduction == tf.keras.losses.Reduction.NONE
  
imports: import pytest
  import numpy
  import tensorflow
  from tensorflow_addons.losses import focal_loss
label_desc: Use image node_id 1 for calling a global function with example usage: test_config() without return types