ENH: Add GPU CopyFrom Unit Test

paddle/framework/tensor_test.cc

@@ -198,8 +198,8 @@ TEST(Tensor, CopyFrom) {
     int arr[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
     memcpy(src_ptr, arr, 9 * sizeof(int));
 
-    auto cpu_ctx = paddle::platform::CPUDeviceContext();
-    dst_tensor.CopyFrom<int>(src_tensor, cpu_ctx);
+    auto* cpu_ctx = new paddle::platform::CPUDeviceContext();
+    dst_tensor.CopyFrom<int>(src_tensor, *cpu_ctx);
 
     const int* dst_ptr = dst_tensor.data<int>();
     ASSERT_NE(src_ptr, dst_ptr);
@@ -208,7 +208,7 @@ TEST(Tensor, CopyFrom) {
     }
 
     Tensor slice_tensor = src_tensor.Slice<int>(1, 2);
-    dst_tensor.CopyFrom<int>(slice_tensor, cpu_ctx);
+    dst_tensor.CopyFrom<int>(slice_tensor, *cpu_ctx);
     const int* slice_ptr = slice_tensor.data<int>();
     dst_ptr = dst_tensor.data<int>();
     ASSERT_NE(dst_ptr, slice_ptr);
@@ -216,4 +216,47 @@ TEST(Tensor, CopyFrom) {
       EXPECT_EQ(dst_ptr[i], slice_ptr[i]);
     }
   }
+#ifndef PADDLE_ONLY_CPU
+  {
+    Tensor src_tensor;
+    Tensor gpu_tensor;
+    Tensor dst_tensor;
+
+    int* src_ptr = src_tensor.mutable_data<int>(make_ddim({3, 3}), CPUPlace());
+
+    int arr[9] = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+    memcpy(src_ptr, arr, 9 * sizeof(int));
+
+    // CPU Tensor to GPU Tensor
+    auto gpu_ctx = new paddle::platform::CUDADeviceContext(0);
+    gpu_tensor.CopyFrom<int>(src_tensor, *gpu_ctx);
+
+    // GPU Tensor to CPU Tensor
+    auto cpu_ctx = new paddle::platform::CPUDeviceContext();
+    dst_tensor.CopyFrom<int>(gpu_tensor, *cpu_ctx);
+
+    // Compare Tensors
+    const int* dst_ptr = dst_tensor.data<int>();
+    ASSERT_NE(src_ptr, dst_ptr);
+    for (size_t i = 0; i < 9; ++i) {
+      EXPECT_EQ(src_ptr[i], dst_ptr[i]);
+    }
+
+    Tensor slice_tensor = src_tensor.Slice<int>(1, 2);
+
+    // CPU Slice Tensor to GPU Tensor
+    gpu_tensor.CopyFrom<int>(slice_tensor, *gpu_ctx);
+
+    // GPU Tensor to CPU Tensor
+    dst_tensor.CopyFrom<int>(gpu_tensor, *cpu_ctx);
+
+    // Compare Slice Tensors
+    const int* slice_ptr = slice_tensor.data<int>();
+    dst_ptr = dst_tensor.data<int>();
+    ASSERT_NE(dst_ptr, slice_ptr);
+    for (size_t i = 0; i < 3; ++i) {
+      EXPECT_EQ(dst_ptr[i], slice_ptr[i]);
+    }
+  }
+#endif
 }