Adds version.py and nsl.__version__

This change creates `version.py` to hold the version information, which is
shared to `nsl.__version__` and `setup.py`.

Fixes #25

PiperOrigin-RevId: 273395360

Author: csferng

neural_structured_learning/__init__.py

@@ -4,3 +4,4 @@
 from neural_structured_learning import keras
 from neural_structured_learning import lib
 from neural_structured_learning import tools
+from neural_structured_learning.version import __version__

neural_structured_learning/version.py

@@ -0,0 +1,25 @@
+# Copyright 2019 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.
+"""Defines neural_structured_learning version information."""
+
+# We follow Semantic Versioning (https://semver.org/).
+_MAJOR_VERSION = '1'
+_MINOR_VERSION = '0'
+_PATCH_VERSION = '1'
+
+_VERSION_SUFFIX = ''
+
+__version__ = '.'.join([_MAJOR_VERSION, _MINOR_VERSION, _PATCH_VERSION])
+if _VERSION_SUFFIX:
+  __version__ = '{}-{}'.format(__version__, _VERSION_SUFFIX)

setup.py

@@ -13,6 +13,8 @@
 # limitations under the License.
 """Setup file for the TensorFlow Neural Structured Learning pip package."""
 
+import os
+import sys
 import textwrap
 
 import setuptools
@@ -59,9 +61,15 @@
     Incorporating structured signals is done only during training, so the
     performance of the serving/inference workflow remains unchanged.""")
 
+# Adds the path to sys.path so that we can import version.py.
+version_path = os.path.join(os.path.dirname(__file__),
+                            "neural_structured_learning")
+sys.path.append(version_path)
+from version import __version__  # pylint: disable=g-import-not-at-top
+
 setuptools.setup(
     name="neural-structured-learning",
-    version="1.0.1",
+    version=__version__,
     author="Google LLC",
     description="Neural Structured Learning is an open-source TensorFlow "
     "framework to train neural networks with structured signals",