Fix compling error with cuDNN v5 (#15148)

test=develop

paddle/fluid/operators/fused/CMakeLists.txt

@@ -2,7 +2,9 @@ include(operators)
 register_operators(EXCLUDES fusion_transpose_flatten_concat_op fusion_conv_inception_op)
 if (WITH_GPU)
   op_library(fusion_transpose_flatten_concat_op)
-  op_library(fusion_conv_inception_op)
   file(APPEND ${pybind_file} "USE_CUDA_ONLY_OP(fusion_transpose_flatten_concat);\n")
-  file(APPEND ${pybind_file} "USE_CUDA_ONLY_OP(conv2d_inception_fusion);\n")
+  if (NOT ${CUDNN_VERSION} VERSION_LESS 7100)
+      op_library(fusion_conv_inception_op)
+      file(APPEND ${pybind_file} "USE_CUDA_ONLY_OP(conv2d_inception_fusion);\n")
+  endif()
 endif()

paddle/fluid/operators/fused/fusion_conv_inception_op.cu

@@ -21,7 +21,7 @@ DECLARE_uint64(conv_workspace_size_limit);
 namespace paddle {
 namespace operators {
 
-#if CUDNN_VERSION >= 7001
+#if CUDNN_VERSION >= 7100
 using Tensor = framework::Tensor;
 using ScopedTensorDescriptor = platform::ScopedTensorDescriptor;
 using ScopedFilterDescriptor = platform::ScopedFilterDescriptor;
@@ -264,7 +264,7 @@ class CUDNNConvInceptionFusionOpKernel : public framework::OpKernel<T> {
 }  // namespace operators
 }  // namespace paddle
 
-#if CUDNN_VERSION >= 7001
+#if CUDNN_VERSION >= 7100
 namespace ops = paddle::operators;
 REGISTER_OP_CUDA_KERNEL(conv2d_inception_fusion,
                         ops::CUDNNConvInceptionFusionOpKernel<float>,