Add labeler workflow to automatically attach what technique type a PR affects.

PiperOrigin-RevId: 323427385

Author: alanchiao

.github/labeler.yml

@@ -0,0 +1,28 @@
+# Copyright 2020 Google LLC
+#
+# 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.
+
+technique:clustering
+- tensorflow_model_optimization/python/core/clustering/*
+- tensorflow_model_optimization/python/examples/clustering/*
+- tensorflow_model_optimization/g3doc/guide/clustering/*
+
+technique:pruning
+- tensorflow_model_optimization/python/core/pruning/*
+- tensorflow_model_optimization/python/examples/pruning/*
+- tensorflow_model_optimization/g3doc/guide/pruning/*
+
+technique:qat
+- tensorflow_model_optimization/python/core/pruning/*
+- tensorflow_model_optimization/python/examples/pruning/*
+- tensorflow_model_optimization/g3doc/guide/quantization/*

.github/workflows/labeler.yml

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+# Copyright 2020 Google LLC
+#
+# 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.
+
+name: "Pull Request Labeler"
+on:
+- pull_request
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - users: actions/labeler@v2
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"