add math_function_test

paddle/operators/math/CMakeLists.txt

@@ -11,3 +11,6 @@ else()
         cc_library(math_function SRCS math_function.cc DEPS cblas device_context)
     endif()
 endif()    
+
+
+nv_test(math_function_test SRCS math_function_test.cc DEPS math_function)

paddle/operators/math/math_function_test.cc

+#include "paddle/operators/math/math_function.h"
+#include "gtest/gtest.h"
+
+#ifndef PADDLE_ONLY_CPU
+TEST(math_function, GPU) {
+  paddle::framework::Tensor input1;
+  paddle::framework::Tensor input1_gpu;
+  paddle::framework::Tensor input2_gpu;
+  paddle::framework::Tensor out_gpu;
+  paddle::framework::Tensor out;
+
+  auto* cpu_place = new paddle::platform::CPUPlace();
+  float* input1_ptr = input1.mutable_data<float>({2, 2}, *cpu_place);
+  float arr[4] = {0, 1, 2, 3};
+
+  auto* gpu_place = new paddle::platform::GPUPlace(0);
+  paddle::platform::DeviceContext* context = new CUDADeviceContext(gpu_place);
+
+  input1_gpu.CopyFrom<float>(input1, *gpu_place);
+  input2_gpu.CopyFrom<float>(input1, *gpu_place);
+  out_gpu.CopyFrom<float>(input1, *gpu_place);
+
+  matmul<paddle::platform::GPUPlace, float>(input1_gpu, false, input2_gpu,
+                                            false, 1, &out_gpu, 0, context);
+
+  out.CopyFrom<float>(out_gpu, *cpu_place);
+
+  float* out_ptr = out.data<float>();
+  EXPECT_EQ(out_ptr[0], 2);
+  EXPECT_EQ(out_ptr[1], 3);
+  EXPECT_EQ(out_ptr[2], 6);
+  EXPECT_EQ(out_ptr[3], 11);
+}
+#endif
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