Throw warning in case of Triton API minor version mismatch (#90)

* Graceful handling of Triton API minor version mismatch

* Modify conditons

src/client_backend/triton_c_api/triton_loader.cc

@@ -244,16 +244,29 @@ TritonLoader::StartTriton()
   REPORT_TRITONSERVER_ERROR(
       api_version_fn_(&api_version_major, &api_version_minor),
       "unable to get api version");
-  if ((TRITONSERVER_API_VERSION_MAJOR != api_version_major) ||
-      (TRITONSERVER_API_VERSION_MINOR > api_version_minor)) {
-    std::stringstream sstream;
-    sstream << "triton server API version mismatch. \n"
-            << "Expected version major:" << TRITONSERVER_API_VERSION_MAJOR
-            << ", minor:" << TRITONSERVER_API_VERSION_MINOR << "\n"
-            << "  Actual version major:" << api_version_major
-            << ", minor:" << api_version_minor;
-    return Error(sstream.str());
+
+  auto createErrorMessage = [](const std::string& message, int expected,
+                               int actual) {
+    return message + "Expected version: " + std::to_string(expected) + "\n" +
+           "Actual version: " + std::to_string(actual) + "\n";
+  };
+
+  if (TRITONSERVER_API_VERSION_MAJOR != api_version_major) {
+    std::string errorMessage = createErrorMessage(
+        "Error: Triton server API major version mismatch.\n",
+        TRITONSERVER_API_VERSION_MAJOR, api_version_major);
+    return Error(errorMessage);
+  }
+
+  if (TRITONSERVER_API_VERSION_MINOR != api_version_minor) {
+    std::string warningMessage = createErrorMessage(
+        "Warning: Triton server API minor version mismatch.\n",
+        TRITONSERVER_API_VERSION_MINOR, api_version_minor);
+    warningMessage +=
+        "Attempting to proceed, but undefined behavior may occur.\n";
+    std::cerr << warningMessage;
   }
+
   // Create the server...
   TRITONSERVER_ServerOptions* server_options = nullptr;
   RETURN_IF_TRITONSERVER_ERROR(