add regression tests

tests/nn_test.py

@@ -0,0 +1,38 @@
+# Copyright 2018 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.
+
+"""Tests for nn module."""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+from absl.testing import absltest
+from absl.testing import parameterized
+
+import numpy as onp
+
+from jax import test_util as jtu
+from jax.test_util import check_grads
+from jax import nn
+from jax import random
+
+from jax.config import config
+config.parse_flags_with_absl()
+
+class NNTest(jtu.JaxTestCase):
+  def testSoftplusGrad(self):
+    check_grads(nn.softplus, (1e-8,), 4)
+  def testSoftplusValue(self):
+    val = nn.softplus(89.)
+    self.assertEqual(val, 89.)