added testcase for erf

tests/CMakeLists.txt

@@ -96,6 +96,7 @@ ncnn_add_layer_test(Dropout)
 ncnn_add_layer_test(Einsum)
 ncnn_add_layer_test(Eltwise)
 ncnn_add_layer_test(ELU)
+ncnn_add_layer_test(Erf)
 ncnn_add_layer_test(ExpandDims)
 ncnn_add_layer_test(Flatten)
 ncnn_add_layer_test(Fold)

tests/test_erf.cpp

@@ -0,0 +1,65 @@
+// Tencent is pleased to support the open source community by making ncnn available.
+//
+// Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
+//
+// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
+// in compliance with the License. You may obtain a copy of the License at
+//
+// https://opensource.org/licenses/BSD-3-Clause
+//
+// 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.
+
+#include "layer/erf.h"
+#include "testutil.h"
+
+static int test_erf(const ncnn::Mat& a)
+{
+    ncnn::ParamDict pd;
+
+    std::vector<ncnn::Mat> weights(0);
+
+    int ret = test_layer<ncnn::Erf>("Erf", pd, weights, a);
+    if (ret != 0)
+    {
+        fprintf(stderr, "test_erf failed a.dims=%d a=(%d %d %d)\n", a.dims, a.w, a.h, a.c);
+    }
+
+    return ret;
+}
+
+static int test_erf_0()
+{
+    return 0
+           || test_erf(RandomMat(10, 12, 5))
+           || test_erf(RandomMat(3, 6, 18))
+           || test_erf(RandomMat(12, 4, 7));
+}
+
+static int test_erf_1()
+{
+    return 0
+           || test_erf(RandomMat(12, 28))
+           || test_erf(RandomMat(20, 15))
+           || test_erf(RandomMat(19, 13));
+}
+
+static int test_erf_2()
+{
+    return 0
+           || test_erf(RandomMat(64))
+           || test_erf(RandomMat(156))
+           || test_erf(RandomMat(243));
+}
+
+int main()
+{
+    SRAND(7767517);
+
+    return 0
+           || test_erf_0()
+           || test_erf_1()
+           || test_erf_2();
+}