Update to 1.18.0 resources (#17)

* update to 1.18.0 resources

* Update Package.swift

Co-authored-by: Edward Chen <18449977+edgchen1@users.noreply.github.com>

* update

---------

Co-authored-by: rachguo <rachguo@rachguos-Mini.attlocal.net>
Co-authored-by: Edward Chen <18449977+edgchen1@users.noreply.github.com>

objectivec/ort_training_session.mm

@@ -19,8 +19,9 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @implementation ORTTrainingSession {
-  std::optional<Ort::TrainingSession> _session;
+  ORTEnv* _env;  // keep a strong reference so the ORTEnv doesn't get destroyed before this does
   ORTCheckpoint* _checkpoint;
+  std::optional<Ort::TrainingSession> _session;
 }
 
 - (Ort::TrainingSession&)CXXAPIOrtTrainingSession {
@@ -28,7 +29,7 @@ NS_ASSUME_NONNULL_BEGIN
 }
 
 - (nullable instancetype)initWithEnv:(ORTEnv*)env
-                      sessionOptions:(ORTSessionOptions*)sessionOptions
+                      sessionOptions:(nullable ORTSessionOptions*)sessionOptions
                           checkpoint:(ORTCheckpoint*)checkpoint
                       trainModelPath:(NSString*)trainModelPath
                        evalModelPath:(nullable NSString*)evalModelPath
@@ -39,9 +40,17 @@ NS_ASSUME_NONNULL_BEGIN
   }
 
   try {
+    if (!sessionOptions) {
+      sessionOptions = [[ORTSessionOptions alloc] initWithError:error];
+      if (!sessionOptions) {
+        return nil;
+      }
+    }
+
     std::optional<std::string> evalPath = utils::toStdOptionalString(evalModelPath);
     std::optional<std::string> optimizerPath = utils::toStdOptionalString(optimizerModelPath);
 
+    _env = env;
     _checkpoint = checkpoint;
     _session = Ort::TrainingSession{
         [env CXXAPIOrtEnv],
@@ -50,6 +59,7 @@ NS_ASSUME_NONNULL_BEGIN
         trainModelPath.UTF8String,
         evalPath,
         optimizerPath};
+
     return self;
   }
   ORT_OBJC_API_IMPL_CATCH_RETURNING_NULLABLE(error)