add test

Signed-off-by: ihb2032 <hebome@foxmail.com>

Author: ihb2032

tests/test_log.cpp

@@ -0,0 +1,56 @@
+// Copyright 2026 ihb2032 <hebome@foxmail.com>
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include "testutil.h"
+
+static int test_log(const ncnn::Mat& a, float base, float scale, float shift)
+{
+    ncnn::ParamDict pd;
+    pd.set(0, base);
+    pd.set(1, scale);
+    pd.set(2, shift);
+
+    std::vector<ncnn::Mat> weights(0);
+
+    int ret = test_layer("Log", pd, weights, a);
+    if (ret != 0)
+    {
+        fprintf(stderr, "test_log failed a.dims=%d a=(%d %d %d %d) base=%f scale=%f shift=%f\n", a.dims, a.w, a.h, a.d, a.c, base, scale, shift);
+    }
+
+    return ret;
+}
+
+static int test_log_0()
+{
+    return 0
+           || test_log(RandomMat(5, 7, 24, 0.001f, 2.f), -1.f, 1.f, 0.f)
+           || test_log(RandomMat(7, 9, 12, 0.001f, 2.f), -1.f, 0.75f, 0.25f)
+           || test_log(RandomMat(3, 5, 13, 0.001f, 2.f), 2.f, 0.5f, 0.125f);
+}
+
+static int test_log_1()
+{
+    return 0
+           || test_log(RandomMat(15, 24, 0.001f, 2.f), -1.f, 1.f, 0.f)
+           || test_log(RandomMat(17, 12, 0.001f, 2.f), -1.f, 1.25f, 0.5f)
+           || test_log(RandomMat(19, 15, 0.001f, 2.f), 2.f, 0.75f, 0.25f);
+}
+
+static int test_log_2()
+{
+    return 0
+           || test_log(RandomMat(128, 0.001f, 2.f), -1.f, 1.f, 0.f)
+           || test_log(RandomMat(124, 0.001f, 2.f), -1.f, 0.5f, 0.25f)
+           || test_log(RandomMat(127, 0.001f, 2.f), 2.f, 1.5f, 0.125f);
+}
+
+int main()
+{
+    SRAND(7767517);
+
+    return 0
+           || test_log_0()
+           || test_log_1()
+           || test_log_2();
+}