add back kt-legacy for import kerastuner (#899)

.github/workflows/actions.yml

@@ -34,6 +34,33 @@ jobs:
           pytest --cov=keras_tuner --cov-report xml:coverage.xml
       - name: Codecov
         uses: codecov/codecov-action@v3
+  compatibility:
+    name: Check compatibility with TF 2.0
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.7'
+      - name: Get pip cache dir
+        id: pip-cache
+        run: |
+          python -m pip install --upgrade pip setuptools
+          echo "dir=$(pip cache dir)" >> $GITHUB_OUTPUT
+      - name: pip cache
+        uses: actions/cache@v3
+        with:
+          path: ${{ steps.pip-cache.outputs.dir }}
+          key: ${{ runner.os }}-pip-${{ hashFiles('setup.py') }}
+      - name: Install dependencies
+        run: |
+          pip install protobuf==3.20.1
+          pip install "tensorflow<2.1"
+          pip install -e ".[tensorflow-cpu,tests]" --progress-bar off --upgrade
+      - name: Test with pytest
+        run: |
+          pytest keras_tuner/integration_tests/legacy_import_test.py
   format:
     name: Check the code format
     runs-on: ubuntu-latest
@@ -84,7 +111,7 @@ jobs:
       - name: Run the guides
         run: bash shell/run_guides.sh
   deploy:
-    needs: [build, format]
+    needs: [build, format,compatibility]
     if: github.event_name == 'release' && github.event.action == 'created'
     runs-on: ubuntu-latest
     steps:

RELEASE.md

@@ -5,8 +5,6 @@
   to install TensorFlow either separately with KerasTuner or with
   `pip install keras_tuner[tensorflow]`. This change is because some people may
   want to use KerasTuner with `tensorflow-cpu` instead of `tensorflow`.
-* Remove the legacy import name of `kerastuner`. From now on, only
-  `import keras_tuner` is supported.
 
 ## Bug fixes
 * KerasTuner used to require protobuf version to be under 3.20. The limit is

keras_tuner/integration_tests/legacy_import_test.py

@@ -0,0 +1,53 @@
+# Copyright 2019 The KerasTuner Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+
+
+def test_kerastuner_same_as_keras_tuner():
+    with pytest.deprecated_call():
+        import kerastuner
+        from kerastuner.tuners import RandomSearch  # noqa: F401
+        from kerastuner.tuners import BayesianOptimization  # noqa: F401
+        from kerastuner.tuners import Hyperband  # noqa: F401
+        from kerastuner.engine.base_tuner import BaseTuner  # noqa: F401
+        from kerastuner.engine.conditions import Condition  # noqa: F401
+        from kerastuner.engine.hypermodel import HyperModel  # noqa: F401
+        from kerastuner.engine.hyperparameters import (  # noqa: F401
+            HyperParameter,
+        )
+        from kerastuner.engine.hyperparameters import (  # noqa: F401
+            HyperParameters,
+        )
+        from kerastuner.engine.metrics_tracking import (  # noqa: F401
+            MetricObservation,
+        )
+        from kerastuner import Objective  # noqa: F401
+        from kerastuner.engine.oracle import Oracle  # noqa: F401
+        from kerastuner.engine.tuner import Tuner  # noqa: F401
+        from kerastuner.engine.stateful import Stateful  # noqa: F401
+        from kerastuner.engine.trial import Trial  # noqa: F401
+        from kerastuner.engine.multi_execution_tuner import (  # noqa: F401
+            MultiExecutionTuner,
+        )
+        from kerastuner.applications import HyperResNet  # noqa: F401
+        from kerastuner.applications import HyperXception  # noqa: F401
+
+    import keras_tuner
+
+    attr1 = [attr for attr in dir(kerastuner) if not attr.startswith("__")]
+    attr2 = [attr for attr in dir(keras_tuner) if not attr.startswith("__")]
+
+    assert len(attr1) > 20
+    assert set(attr1) >= set(attr2)

setup.py

@@ -29,6 +29,7 @@
     install_requires=[
         "packaging",
         "requests",
+        "kt-legacy",
     ],
     extras_require={
         "tensorflow": [