[OVEP] Enable stateful mode for Phi-silica models

onnxruntime/core/providers/openvino/ov_interface.cc

@@ -361,7 +361,11 @@ void OVInferRequest::Infer() {
 StatefulOVInferRequest::StatefulOVInferRequest(ov::InferRequest infer_request, std::string device)
     : OVInferRequest(std::move(infer_request)), target_device(device) {
   bool gpu_or_npu = ((device.find("NPU") != std::string::npos) || (device.find("GPU") != std::string::npos));
-  if (gpu_or_npu) {
+
+  // check if there is input_ids tensors and if the tensor type is int64,
+  // because logic prefill_use_full_chat_history is only for specific inputs and data type
+  auto input_ids_opt = FindTensor("input_ids");
+  if (gpu_or_npu && input_ids_opt.has_value() && input_ids_opt->get_element_type() == ov::element::i64) {
     prefill_use_full_chat_history = true;
   }
 }

onnxruntime/core/providers/openvino/ov_stateful_patch_utils.cc

@@ -59,6 +59,17 @@ bool ModelHasInputOutputNames(std::shared_ptr<ov::Model> model, const std::strin
   return false;
 }
 
+std::string GetInputOutputName(std::shared_ptr<ov::Model> ov_model,
+                            const std::vector<std::string>& candidate_names) {
+  for (const auto& name : candidate_names) {
+    if (ModelHasInputOutputNames(ov_model, name)) {
+      return name;
+    }
+  }
+  // Return the first candidate as default if none are found
+  return candidate_names.empty() ? "" : candidate_names[0];
+}
+
 void FuseCacheReorder(std::shared_ptr<ov::Model> ov_model,
                       std::vector<std::string>& not_kv_inputs,
                       const std::vector<std::string>& key_value_input_names,
@@ -67,10 +78,15 @@ void FuseCacheReorder(std::shared_ptr<ov::Model> ov_model,
     throw std::runtime_error("Model already has fused cache");
   }
 
-  std::string main_input_name = "inputs_embeds";
-  if (ModelHasInputOutputNames(ov_model, "input_ids")) {
-    main_input_name = "input_ids";
-  }
+    // Define input name candidates in priority order
+  const std::vector<std::string> input_name_candidates = {
+    "inputs_embeds",                           // Default fallback
+    "input_ids",                               // Most common
+    "input_hidden_states",                     // Alternative
+    "/model/embed_tokens/Gather_output_0"      // Specific model type
+  };
+
+  std::string main_input_name = GetInputOutputName(ov_model, input_name_candidates);
 
   auto input_batch = ov_model->input(main_input_name).get_partial_shape()[0];
 
@@ -121,20 +137,22 @@ void MakeStateful(std::shared_ptr<ov::Model>& ov_model,
 void PatchStatefulDecoder(std::shared_ptr<ov::Model> model) {
   std::vector<std::string> key_value_input_names;
   std::vector<std::string> not_kv_inputs;
-  for (const ov::Output<ov::Node>& input : model->inputs()) {
-    auto& names = input.get_names();
-
-    bool found = false;
-    for (auto& name : names) {
-      if (name.find("key_values") != std::string::npos) {
-        key_value_input_names.push_back(name);
+  const auto& params = model->get_parameters();
+  bool found = false;
+  for (size_t i = 0; i < params.size(); i++) {
+    auto param_name = params.at(i)->output(0).get_any_name();
+    if (param_name.find("key_values") != std::string::npos) {
+         key_value_input_names.push_back(param_name);
+        found = true;
+    } else if (param_name.find("key") != std::string::npos) {
+        key_value_input_names.push_back(param_name);
+        found = true;
+    } else if (param_name.find("value") != std::string::npos) {
+        key_value_input_names.push_back(param_name);
         found = true;
-        break;
-      }
     }
-
     if (!found) {
-      not_kv_inputs.push_back(input.get_any_name());
+      not_kv_inputs.push_back(param_name);
     }
   }