[ Opt Fix ] Add comments about opt version and version check (#2889)

lite/api/opt.cc

@@ -26,6 +26,7 @@
 #include "lite/api/paddle_use_ops.h"
 #include "lite/api/paddle_use_passes.h"
 #include "lite/core/op_registry.h"
+#include "lite/core/version.h"
 #include "lite/model_parser/compatible_pb.h"
 #include "lite/model_parser/pb/program_desc.h"
 #include "lite/utils/cp_logging.h"
@@ -239,6 +240,7 @@ void PrintOpsInfo(std::set<std::string> valid_ops = {}) {
 /// Print help information
 void PrintHelpInfo() {
   // at least one argument should be inputed
+  const std::string opt_version = lite::version();
   const char help_info[] =
       "At least one argument should be inputed. Valid arguments are listed "
       "below:\n"
@@ -260,7 +262,8 @@ void PrintHelpInfo() {
       "        `--print_model_ops=true  --model_dir=<model_param_dir> "
       "--valid_targets=(arm|opencl|x86|npu|xpu)`"
       "  Display operators in the input model\n";
-  std::cout << help_info << std::endl;
+  std::cout << "opt version:" << opt_version << std::endl
+            << help_info << std::endl;
   exit(1);
 }
 

lite/demo/cxx/mobile_light/mobilenetv1_light_api.cc

@@ -28,6 +28,9 @@ void RunModel(std::string model_dir) {
   // 1. Set MobileConfig
   MobileConfig config;
   config.set_model_dir(model_dir);
+  // To load model transformed by opt after release/v2.3.0, plese use
+  // `set_model_from_file` listed below.
+  // config.set_model_from_file(model_dir);
 
   // 2. Create PaddlePredictor by MobileConfig
   std::shared_ptr<PaddlePredictor> predictor =

lite/model_parser/model_parser.cc

@@ -696,6 +696,13 @@ void LoadModelNaive(const std::string &model_dir,
   CHECK(scope);
   cpp_prog->ClearBlocks();
 
+  LOG(WARNING)
+      << "WARNING: MobileConfig::set_model_dir and "
+         "MobileConfig::set_model_buffer are deprecated APIs "
+         "and will be removed in latter release. \n"
+         "    MobileConfig::set_model_from_file(const std::string& model_file)"
+         " and MobileConfig::set_model_from_buffer(const std::string& "
+         "model_buffer) are recommended.";
   // Load model
   const std::string prog_path = model_dir + "/__model__.nb";
   naive_buffer::BinaryTable table;
@@ -786,11 +793,23 @@ void LoadModelNaiveFromFile(const std::string &filename,
 
   // (2)get opt version
   char opt_version[16];
-  const uint64_t paddle_version_length = 16 * sizeof(char);
+  const uint64_t opt_version_length = 16 * sizeof(char);
   ReadModelDataFromFile<char>(
-      opt_version, prog_path, &offset, paddle_version_length);
+      opt_version, prog_path, &offset, opt_version_length);
   VLOG(4) << "Opt_version:" << opt_version;
 
+  // check version, opt's version should be consistent with current Paddle-Lite
+  // version.
+  const std::string paddle_version = version();
+  const std::string opt_version_str = opt_version;
+  if (paddle_version != opt_version_str) {
+    LOG(WARNING) << "warning: the version of opt that transformed this model "
+                    "is not consistent with current Paddle-Lite version."
+                    "\n      version of opt:"
+                 << opt_version
+                 << "\n      version of current Paddle-Lite:" << paddle_version;
+  }
+
   // (3)get topo_size
   uint64_t topo_size;
   ReadModelDataFromFile<uint64_t>(