fix compilation error on Windows, test=develop

Author: Avin0323

paddle/fluid/operators/eigen/eigen_function.h

@@ -12,6 +12,12 @@ 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. */
 #pragma once
+#ifndef _USE_MATH_DEFINES
+#define _USE_MATH_DEFINES
+#endif
+#ifndef NOMINMAX
+#define NOMINMAX
+#endif
 #include "unsupported/Eigen/CXX11/Tensor"
 
 namespace paddle {

paddle/fluid/operators/eigen/erf.cc

@@ -11,12 +11,6 @@ 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. */
-#ifndef _USE_MATH_DEFINES
-#define _USE_MATH_DEFINES
-#endif
-#ifndef NOMINMAX
-#define NOMINMAX
-#endif
 #include "paddle/fluid/operators/eigen/eigen_function.h"
 #include "paddle/fluid/platform/eigen_ext.h"
 #include "paddle/fluid/platform/float16.h"