Add associated test

keras/optimizers/legacy/optimizer_v2_test.py

@@ -15,6 +15,7 @@
 """Functional test for OptimizerV2."""
 
 import collections
+import os
 from copy import deepcopy
 
 import numpy as np
@@ -568,6 +569,33 @@ def testOptimizerWithKerasModel(self):
             batch_size=5,
         )
 
+    @test_combinations.generate(test_combinations.combine(mode=["eager"]))
+    def testOptimizerSaving(self):
+        np.random.seed(1331)
+        input_np = np.random.random((10, 3))
+        output_np = np.random.random((10, 4))
+        a = input_layer.Input(shape=(3,), name="input_a")
+        model = sequential.Sequential()
+        model.add(core.Dense(4, kernel_initializer="zeros", name="dense"))
+        model.add(regularization.Dropout(0.5, name="dropout"))
+        model(a)
+        optimizer = gradient_descent.SGD(learning_rate=0.1)
+        model.compile(optimizer, loss="mse", metrics=["mae"])
+
+        model.fit(
+            input_np,
+            output_np,
+            batch_size=10,
+            validation_data=(input_np, output_np),
+            epochs=2,
+            verbose=0,
+        )
+
+        temp_filepath = os.path.join(self.get_temp_dir(), "optv2_model.keras")
+        model.save(temp_filepath)
+        loaded_model = keras.models.load_model(temp_filepath)
+        self.assertAllClose(model(input_np), loaded_model(input_np), atol=1e-6)
+
     @test_combinations.generate(
         test_combinations.combine(mode=["graph", "eager"])
     )