[Auto Parallel] Add links for the reference codes. (#41829)

* [Auto Parallel] Add links for the reference codes.

* Update recorder.py

* Update trial.py

* Update test=document_fix

* Update test=document_fix

python/paddle/distributed/auto_parallel/tuner/recorder.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Notice that the following codes are modified from KerasTuner for a different purpose. 
+# Please refer to https://github.com/keras-team/keras-tuner/blob/master/keras_tuner/engine/metrics_tracking.py.
+
 import numpy as np
 
 

python/paddle/distributed/auto_parallel/tuner/storable.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Notice that the following codes are modified from KerasTuner for a different purpose. 
+# Please refer to https://github.com/keras-team/keras-tuner/blob/master/keras_tuner/engine/metrics_tracking.py.
+
 import json
 
 

python/paddle/distributed/auto_parallel/tuner/trial.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Notice that the following codes are modified from KerasTuner to implement our own tuner. 
+# Please refer to https://github.com/keras-team/keras-tuner/blob/master/keras_tuner/engine/trial.py.
+
 import hashlib
 import random
 import time

python/paddle/distributed/auto_parallel/tuner/tunable_space.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Notice that the following codes are modified from KerasTuner to implement our own tuner. 
+# Please refer to https://github.com/keras-team/keras-tuner/blob/master/keras_tuner/engine/hyperparameters.py.
+
 import collections
 import contextlib
 import copy

python/paddle/distributed/auto_parallel/tuner/tunable_variable.py

@@ -12,6 +12,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# Notice that the following codes are modified from KerasTuner to implement our own tuner. 
+# Please refer to https://github.com/keras-team/keras-tuner/blob/master/keras_tuner/engine/hyperparameters.py.
+
 import numpy as np