use values instead of Fixed for user specified hp value (#1534)

Co-authored-by: Haifeng Jin <haifeng-jin@users.noreply.github.com>

autokeras/utils/utils.py

@@ -16,7 +16,6 @@
 
 import kerastuner
 import tensorflow as tf
-from kerastuner.engine import hyperparameters
 from packaging.version import parse
 from tensorflow.python.util import nest
 
@@ -114,8 +113,6 @@ def run_with_adaptive_batch_size(batch_size, func, **fit_kwargs):
 def get_hyperparameter(value, hp, dtype):
     if value is None:
         return hp
-    elif isinstance(value, dtype):
-        return hyperparameters.Fixed(hp.name, value)
     return value
 
 
@@ -126,6 +123,8 @@ def add_to_hp(hp, hps, name=None):
         hp: kerastuner.HyperParameters.
         name: String. If left unspecified, the hp name is used.
     """
+    if not isinstance(hp, kerastuner.engine.hyperparameters.HyperParameter):
+        return hp
     kwargs = hp.get_config()
     if name is None:
         name = hp.name

tests/unit_tests/utils/utils_test.py

@@ -65,9 +65,10 @@ def test_get_hyperparameter_with_none_return_hp():
     assert isinstance(hp, hyperparameters.Choice)
 
 
-def test_get_hyperparameter_with_int_return_fixed():
-    hp = utils.get_hyperparameter(10, hyperparameters.Choice("hp", [10, 20]), int)
-    assert isinstance(hp, hyperparameters.Fixed)
+def test_get_hyperparameter_with_int_return_int():
+    value = utils.get_hyperparameter(10, hyperparameters.Choice("hp", [10, 20]), int)
+    assert isinstance(value, int)
+    assert value == 10
 
 
 def test_get_hyperparameter_with_hp_return_same():