move yolov3_loss to detection. test=develop

Author: heavengate

paddle/fluid/operators/detection/CMakeLists.txt

@@ -31,6 +31,7 @@ detection_library(polygon_box_transform_op SRCS polygon_box_transform_op.cc
 polygon_box_transform_op.cu)
 detection_library(rpn_target_assign_op SRCS rpn_target_assign_op.cc)
 detection_library(generate_proposal_labels_op SRCS generate_proposal_labels_op.cc)
+detection_library(yolov3_loss_op SRCS yolov3_loss_op.cc)
 
 if(WITH_GPU)
   detection_library(generate_proposals_op SRCS generate_proposals_op.cc generate_proposals_op.cu DEPS memory cub)

paddle/fluid/operators/yolov3_loss_op.cc renamed to paddle/fluid/operators/detection/yolov3_loss_op.cc

@@ -9,7 +9,7 @@
    See the License for the specific language governing permissions and
    limitations under the License. */
 
-#include "paddle/fluid/operators/yolov3_loss_op.h"
+#include "paddle/fluid/operators/detection/yolov3_loss_op.h"
 #include "paddle/fluid/framework/op_registry.h"
 
 namespace paddle {