Make pecos.xmr importable and add unit test

pecos/xmr/__init__.py

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+#  Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
+#  with the License. A copy of the License is located at
+#
+#  http://aws.amazon.com/apache2.0/
+#
+#  or in the "license" file accompanying this file. This file 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.

pecos/xmr/reranker/__init__.py

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+#  Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
+#  with the License. A copy of the License is located at
+#
+#  http://aws.amazon.com/apache2.0/
+#
+#  or in the "license" file accompanying this file. This file 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.

test/pecos/xmr/test_reranker.py

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+#  Copyright 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file except in compliance
+#  with the License. A copy of the License is located at
+#
+#  http://aws.amazon.com/apache2.0/
+#
+#  or in the "license" file accompanying this file. This file 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  # noqa: F401; pylint: disable=unused-variable
+
+
+def test_importable():
+    import pecos.xmr  # noqa: F401
+    import pecos.xmr.reranker  # noqa: F401
+    from pecos.xmr.reranker.model import TextNumrEncoder  # noqa: F401
+    from pecos.xmr.reranker.model import RankingModel  # noqa: F401
+    from pecos.xmr.reranker.trainer import RankingTrainer  # noqa: F401
+
+
+def test_model():
+    from pecos.xmr.reranker.model import NumrMLPEncoderConfig
+
+    mlp_config = NumrMLPEncoderConfig(
+        inp_feat_dim=5,
+        inp_dropout_prob=0.5,
+        hid_actv_type="gelu",
+        hid_size_list=[8, 16],
+    )
+    assert mlp_config.inp_feat_dim == 5
+    assert mlp_config.inp_dropout_prob == 0.5
+    assert mlp_config.hid_actv_type == "gelu"
+    assert mlp_config.hid_size_list == [8, 16]