Add tanh test case

Author: LuoYuanke

ideep4py/tests/mm/test_tanh.py

@@ -0,0 +1,30 @@
+import numpy
+from chainer import testing
+import ideep4py
+
+# x = numpy.ndarray(shape=(1,32,224,224), dtype=numpy.float32, order='C')
+x = numpy.random.uniform(-1, 1, (1, 32, 2, 224)).astype(numpy.float32)
+y = numpy.tanh(x)
+
+mx = ideep4py.mdarray(x)
+x2 = numpy.array(mx)
+testing.assert_allclose(x, x2)
+
+print("tanh fwd")
+my = ideep4py._ideep4py.tanh.Forward(mx)
+y2 = numpy.array(my)
+testing.assert_allclose(y, y2)
+
+# Test backward
+print("tanh bwd")
+x = numpy.random.uniform(-1, 1, (1, 32, 224, 224)).astype(numpy.float32)
+gy = numpy.random.uniform(-1, 1, (1, 32, 224, 224)).astype(numpy.float32)
+gx = gy * (1 - numpy.tanh(x) ** 2)
+
+
+mx = ideep4py.mdarray(x)
+mgy = ideep4py.mdarray(gy)
+mgx = ideep4py._ideep4py.tanh.Backward(mx, mgy)
+
+gx1 = numpy.array(mgx)
+testing.assert_allclose(gx1, gx)