fix bug of ctx use

mindspore/lite/tools/benchmark/benchmark.cc

@@ -20,11 +20,11 @@
 #undef __STDC_FORMAT_MACROS
 #include <algorithm>
 #include <utility>
-#include "src/common/common.h"
-#include "include/ms_tensor.h"
 #include "include/context.h"
-#include "src/runtime/runtime_api.h"
+#include "include/ms_tensor.h"
 #include "include/version.h"
+#include "src/common/common.h"
+#include "src/runtime/runtime_api.h"
 
 namespace mindspore {
 namespace lite {
@@ -378,26 +378,23 @@ int Benchmark::RunBenchmark() {
     std::cerr << "New context failed while running " << model_name.c_str() << std::endl;
     return RET_ERROR;
   }
-  auto &device_ctx = context->device_list_[0];
-  if (flags_->device_ == "CPU") {
-    device_ctx.device_type_ = lite::DT_CPU;
-  } else if (flags_->device_ == "GPU") {
-    device_ctx.device_type_ = lite::DT_GPU;
-  }
 
-  if (device_ctx.device_type_ == DT_CPU) {
-    if (flags_->cpu_bind_mode_ == MID_CPU) {
-      device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = MID_CPU;
-    } else if (flags_->cpu_bind_mode_ == HIGHER_CPU) {
-      device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = HIGHER_CPU;
-    } else {
-      device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = NO_BIND;
-    }
-    device_ctx.device_info_.cpu_device_info_.enable_float16_ = flags_->enable_fp16_;
+  auto &cpu_device_ctx = context->device_list_[0];
+  if (flags_->cpu_bind_mode_ == MID_CPU) {
+    cpu_device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = MID_CPU;
+  } else if (flags_->cpu_bind_mode_ == HIGHER_CPU) {
+    cpu_device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = HIGHER_CPU;
+  } else {
+    cpu_device_ctx.device_info_.cpu_device_info_.cpu_bind_mode_ = NO_BIND;
   }
-  if (device_ctx.device_type_ == DT_GPU) {
-    device_ctx.device_info_.gpu_device_info_.enable_float16_ = flags_->enable_fp16_;
+  cpu_device_ctx.device_info_.cpu_device_info_.enable_float16_ = flags_->enable_fp16_;
+
+  if (flags_->device_ == "GPU") {
+    DeviceContext gpu_device_ctx{DT_GPU, {false}};
+    gpu_device_ctx.device_info_.gpu_device_info_.enable_float16_ = flags_->enable_fp16_;
+    context->device_list_.push_back(gpu_device_ctx);
   }
+
   context->thread_num_ = flags_->num_threads_;
 
   session_ = session::LiteSession::CreateSession(context.get());