diff --git a/sherpa-onnx/csrc/CMakeLists.txt b/sherpa-onnx/csrc/CMakeLists.txt
index 877c31ed..9bbe3645 100644
--- a/sherpa-onnx/csrc/CMakeLists.txt
+++ b/sherpa-onnx/csrc/CMakeLists.txt
@@ -48,6 +48,7 @@ set(sources
   online-transducer-model.cc
   online-transducer-modified-beam-search-decoder.cc
   online-zipformer-transducer-model.cc
+  online-zipformer2-transducer-model.cc
   onnx-utils.cc
   session.cc
   packed-sequence.cc
diff --git a/sherpa-onnx/csrc/online-transducer-model.cc b/sherpa-onnx/csrc/online-transducer-model.cc
index 5d60a021..d8cb578f 100644
--- a/sherpa-onnx/csrc/online-transducer-model.cc
+++ b/sherpa-onnx/csrc/online-transducer-model.cc
@@ -18,6 +18,7 @@
 #include "sherpa-onnx/csrc/online-conformer-transducer-model.h"
 #include "sherpa-onnx/csrc/online-lstm-transducer-model.h"
 #include "sherpa-onnx/csrc/online-zipformer-transducer-model.h"
+#include "sherpa-onnx/csrc/online-zipformer2-transducer-model.h"
 #include "sherpa-onnx/csrc/onnx-utils.h"
 
 namespace {
@@ -26,6 +27,7 @@ enum class ModelType {
   kConformer,
   kLstm,
   kZipformer,
+  kZipformer2,
   kUnkown,
 };
 
@@ -65,6 +67,8 @@ static ModelType GetModelType(char *model_data, size_t model_data_length,
     return ModelType::kLstm;
   } else if (model_type.get() == std::string("zipformer")) {
     return ModelType::kZipformer;
+  } else if (model_type.get() == std::string("zipformer2")) {
+    return ModelType::kZipformer2;
   } else {
     SHERPA_ONNX_LOGE("Unsupported model_type: %s", model_type.get());
     return ModelType::kUnkown;
@@ -88,6 +92,8 @@ std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
       return std::make_unique<OnlineLstmTransducerModel>(config);
     case ModelType::kZipformer:
       return std::make_unique<OnlineZipformerTransducerModel>(config);
+    case ModelType::kZipformer2:
+      return std::make_unique<OnlineZipformer2TransducerModel>(config);
     case ModelType::kUnkown:
       SHERPA_ONNX_LOGE("Unknown model type in online transducer!");
       return nullptr;
@@ -144,6 +150,8 @@ std::unique_ptr<OnlineTransducerModel> OnlineTransducerModel::Create(
       return std::make_unique<OnlineLstmTransducerModel>(mgr, config);
     case ModelType::kZipformer:
       return std::make_unique<OnlineZipformerTransducerModel>(mgr, config);
+    case ModelType::kZipformer2:
+      return std::make_unique<OnlineZipformer2TransducerModel>(mgr, config);
     case ModelType::kUnkown:
       SHERPA_ONNX_LOGE("Unknown model type in online transducer!");
       return nullptr;
diff --git a/sherpa-onnx/csrc/online-zipformer2-transducer-model.cc b/sherpa-onnx/csrc/online-zipformer2-transducer-model.cc
new file mode 100644
index 00000000..0ffb6850
--- /dev/null
+++ b/sherpa-onnx/csrc/online-zipformer2-transducer-model.cc
@@ -0,0 +1,460 @@
+// sherpa-onnx/csrc/online-zipformer2-transducer-model.cc
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/online-zipformer2-transducer-model.h"
+
+#include <assert.h>
+#include <math.h>
+
+#include <algorithm>
+#include <memory>
+#include <sstream>
+#include <string>
+#include <utility>
+#include <vector>
+#include <numeric>
+
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/cat.h"
+#include "sherpa-onnx/csrc/macros.h"
+#include "sherpa-onnx/csrc/online-transducer-decoder.h"
+#include "sherpa-onnx/csrc/onnx-utils.h"
+#include "sherpa-onnx/csrc/session.h"
+#include "sherpa-onnx/csrc/text-utils.h"
+#include "sherpa-onnx/csrc/unbind.h"
+
+namespace sherpa_onnx {
+
+OnlineZipformer2TransducerModel::OnlineZipformer2TransducerModel(
+    const OnlineTransducerModelConfig &config)
+    : env_(ORT_LOGGING_LEVEL_WARNING),
+      config_(config),
+      sess_opts_(GetSessionOptions(config)),
+      allocator_{} {
+  {
+    auto buf = ReadFile(config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
+}
+
+#if __ANDROID_API__ >= 9
+OnlineZipformer2TransducerModel::OnlineZipformer2TransducerModel(
+    AAssetManager *mgr, const OnlineTransducerModelConfig &config)
+    : env_(ORT_LOGGING_LEVEL_WARNING),
+      config_(config),
+      sess_opts_(GetSessionOptions(config)),
+      allocator_{} {
+  {
+    auto buf = ReadFile(mgr, config.encoder_filename);
+    InitEncoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.decoder_filename);
+    InitDecoder(buf.data(), buf.size());
+  }
+
+  {
+    auto buf = ReadFile(mgr, config.joiner_filename);
+    InitJoiner(buf.data(), buf.size());
+  }
+}
+#endif
+
+void OnlineZipformer2TransducerModel::InitEncoder(void *model_data,
+                                                 size_t model_data_length) {
+  encoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
+
+  GetInputNames(encoder_sess_.get(), &encoder_input_names_,
+                &encoder_input_names_ptr_);
+
+  GetOutputNames(encoder_sess_.get(), &encoder_output_names_,
+                 &encoder_output_names_ptr_);
+
+  // get meta data
+  Ort::ModelMetadata meta_data = encoder_sess_->GetModelMetadata();
+  if (config_.debug) {
+    std::ostringstream os;
+    os << "---encoder---\n";
+    PrintModelMetadata(os, meta_data);
+    SHERPA_ONNX_LOGE("%s", os.str().c_str());
+  }
+
+  Ort::AllocatorWithDefaultOptions allocator;  // used in the macro below
+  SHERPA_ONNX_READ_META_DATA_VEC(encoder_dims_, "encoder_dims");
+  SHERPA_ONNX_READ_META_DATA_VEC(query_head_dims_, "query_head_dims");
+  SHERPA_ONNX_READ_META_DATA_VEC(value_head_dims_, "value_head_dims");
+  SHERPA_ONNX_READ_META_DATA_VEC(num_heads_, "num_heads");
+  SHERPA_ONNX_READ_META_DATA_VEC(num_encoder_layers_, "num_encoder_layers");
+  SHERPA_ONNX_READ_META_DATA_VEC(cnn_module_kernels_, "cnn_module_kernels");
+  SHERPA_ONNX_READ_META_DATA_VEC(left_context_len_, "left_context_len");
+
+  SHERPA_ONNX_READ_META_DATA(T_, "T");
+  SHERPA_ONNX_READ_META_DATA(decode_chunk_len_, "decode_chunk_len");
+
+  if (config_.debug) {
+    auto print = [](const std::vector<int32_t> &v, const char *name) {
+      fprintf(stderr, "%s: ", name);
+      for (auto i : v) {
+        fprintf(stderr, "%d ", i);
+      }
+      fprintf(stderr, "\n");
+    };
+    print(encoder_dims_, "encoder_dims");
+    print(query_head_dims_, "query_head_dims");
+    print(value_head_dims_, "value_head_dims");
+    print(num_heads_, "num_heads");
+    print(num_encoder_layers_, "num_encoder_layers");
+    print(cnn_module_kernels_, "cnn_module_kernels");
+    print(left_context_len_, "left_context_len");
+    SHERPA_ONNX_LOGE("T: %d", T_);
+    SHERPA_ONNX_LOGE("decode_chunk_len_: %d", decode_chunk_len_);
+  }
+}
+
+void OnlineZipformer2TransducerModel::InitDecoder(void *model_data,
+                                                 size_t model_data_length) {
+  decoder_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                 model_data_length, sess_opts_);
+
+  GetInputNames(decoder_sess_.get(), &decoder_input_names_,
+                &decoder_input_names_ptr_);
+
+  GetOutputNames(decoder_sess_.get(), &decoder_output_names_,
+                 &decoder_output_names_ptr_);
+
+  // get meta data
+  Ort::ModelMetadata meta_data = decoder_sess_->GetModelMetadata();
+  if (config_.debug) {
+    std::ostringstream os;
+    os << "---decoder---\n";
+    PrintModelMetadata(os, meta_data);
+    SHERPA_ONNX_LOGE("%s", os.str().c_str());
+  }
+
+  Ort::AllocatorWithDefaultOptions allocator;  // used in the macro below
+  SHERPA_ONNX_READ_META_DATA(vocab_size_, "vocab_size");
+  SHERPA_ONNX_READ_META_DATA(context_size_, "context_size");
+}
+
+void OnlineZipformer2TransducerModel::InitJoiner(void *model_data,
+                                                size_t model_data_length) {
+  joiner_sess_ = std::make_unique<Ort::Session>(env_, model_data,
+                                                model_data_length, sess_opts_);
+
+  GetInputNames(joiner_sess_.get(), &joiner_input_names_,
+                &joiner_input_names_ptr_);
+
+  GetOutputNames(joiner_sess_.get(), &joiner_output_names_,
+                 &joiner_output_names_ptr_);
+
+  // get meta data
+  Ort::ModelMetadata meta_data = joiner_sess_->GetModelMetadata();
+  if (config_.debug) {
+    std::ostringstream os;
+    os << "---joiner---\n";
+    PrintModelMetadata(os, meta_data);
+    SHERPA_ONNX_LOGE("%s", os.str().c_str());
+  }
+}
+
+std::vector<Ort::Value> OnlineZipformer2TransducerModel::StackStates(
+    const std::vector<std::vector<Ort::Value>> &states) const {
+  int32_t batch_size = static_cast<int32_t>(states.size());
+  int32_t num_encoders = static_cast<int32_t>(num_encoder_layers_.size());
+
+  std::vector<const Ort::Value *> buf(batch_size);
+
+  std::vector<Ort::Value> ans;
+  int32_t num_states = static_cast<int32_t>(states[0].size());
+  ans.reserve(num_states);
+
+  for (int32_t i = 0; i != (num_states - 2) / 6; ++i) {
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i];
+      }
+      auto v = Cat(allocator_, buf, 1);
+      ans.push_back(std::move(v));
+    }
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i + 1];
+      }
+      auto v = Cat(allocator_, buf, 1);
+      ans.push_back(std::move(v));
+    }
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i + 2];
+      }
+      auto v = Cat(allocator_, buf, 1);
+      ans.push_back(std::move(v));
+    }
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i + 3];
+      }
+      auto v = Cat(allocator_, buf, 1);
+      ans.push_back(std::move(v));
+    }
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i + 4];
+      }
+      auto v = Cat(allocator_, buf, 0);
+      ans.push_back(std::move(v));
+    }
+    {
+      for (int32_t n = 0; n != batch_size; ++n) {
+        buf[n] = &states[n][6 * i + 5];
+      }
+      auto v = Cat(allocator_, buf, 0);
+      ans.push_back(std::move(v));
+    }
+  }
+
+  {
+    for (int32_t n = 0; n != batch_size; ++n) {
+      buf[n] = &states[n][num_states - 2];
+    }
+    auto v = Cat(allocator_, buf, 0);
+    ans.push_back(std::move(v));
+  }
+
+  {
+    for (int32_t n = 0; n != batch_size; ++n) {
+      buf[n] = &states[n][num_states - 1];
+    }
+    auto v = Cat<int64_t>(allocator_, buf, 0);
+    ans.push_back(std::move(v));
+  }
+  return ans;
+}
+
+std::vector<std::vector<Ort::Value>>
+OnlineZipformer2TransducerModel::UnStackStates(
+    const std::vector<Ort::Value> &states) const {
+  int32_t m = std::accumulate(num_encoder_layers_.begin(), num_encoder_layers_.end(), 0);
+  assert(states.size() == m * 6 + 2);
+
+  int32_t batch_size = states[0].GetTensorTypeAndShapeInfo().GetShape()[1];
+  int32_t num_encoders = num_encoder_layers_.size();
+
+  std::vector<std::vector<Ort::Value>> ans;
+  ans.resize(batch_size);
+
+  for (int32_t i = 0; i != m; ++i) {
+    {
+      auto v = Unbind(allocator_, &states[i * 6], 1);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+    {
+      auto v = Unbind(allocator_, &states[i * 6 + 1], 1);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+    {
+      auto v = Unbind(allocator_, &states[i * 6 + 2], 1);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+    {
+      auto v = Unbind(allocator_, &states[i * 6 + 3], 1);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+    {
+      auto v = Unbind(allocator_, &states[i * 6 + 4], 0);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+    {
+      auto v = Unbind(allocator_, &states[i * 6 + 5], 0);
+      assert(v.size() == batch_size);
+
+      for (int32_t n = 0; n != batch_size; ++n) {
+        ans[n].push_back(std::move(v[n]));
+      }
+    }
+  }
+
+  {
+    auto v = Unbind(allocator_, &states[m * 6], 0);
+    assert(v.size() == batch_size);
+
+    for (int32_t n = 0; n != batch_size; ++n) {
+      ans[n].push_back(std::move(v[n]));
+    }
+  }
+  {
+    auto v = Unbind<int64_t>(allocator_, &states[m * 6 + 1], 0);
+    assert(v.size() == batch_size);
+
+    for (int32_t n = 0; n != batch_size; ++n) {
+      ans[n].push_back(std::move(v[n]));
+    }
+  }
+
+  return ans;
+}
+
+std::vector<Ort::Value> OnlineZipformer2TransducerModel::GetEncoderInitStates() {
+  std::vector<Ort::Value> ans;
+  int32_t n = static_cast<int32_t>(encoder_dims_.size());
+  int32_t m = std::accumulate(num_encoder_layers_.begin(), num_encoder_layers_.end(), 0);
+  ans.reserve(m * 6 + 2);
+
+  for (int32_t i = 0; i != n; ++i) {
+    int32_t num_layers = num_encoder_layers_[i];
+    int32_t key_dim = query_head_dims_[i] * num_heads_[i];
+    int32_t value_dim = value_head_dims_[i] * num_heads_[i];
+    int32_t nonlin_attn_head_dim = 3 * encoder_dims_[i] / 4;
+
+    for (int32_t j = 0; j != num_layers; ++j) {
+      {
+        std::array<int64_t, 3> s{left_context_len_[i], 1, key_dim};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+
+      {
+        std::array<int64_t, 4> s{1, 1, left_context_len_[i], nonlin_attn_head_dim};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+
+      {
+        std::array<int64_t, 3> s{left_context_len_[i], 1, value_dim};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+
+      {
+        std::array<int64_t, 3> s{left_context_len_[i], 1, value_dim};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+
+      {
+        std::array<int64_t, 3> s{1, encoder_dims_[i], cnn_module_kernels_[i] / 2};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+
+      {
+        std::array<int64_t, 3> s{1, encoder_dims_[i], cnn_module_kernels_[i] / 2};
+        auto v =
+            Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+        Fill(&v, 0);
+        ans.push_back(std::move(v));
+      }
+    }
+  }
+
+  {
+    std::array<int64_t, 4> s{1, 128, 3, 19};
+    auto v = Ort::Value::CreateTensor<float>(allocator_, s.data(), s.size());
+    Fill(&v, 0);
+    ans.push_back(std::move(v));
+  }
+
+  {
+    std::array<int64_t, 1> s{1};
+    auto v = Ort::Value::CreateTensor<int64_t>(allocator_, s.data(), s.size());
+    Fill<int64_t>(&v, 0);
+    ans.push_back(std::move(v));
+  }
+  return ans;
+}
+
+std::pair<Ort::Value, std::vector<Ort::Value>>
+OnlineZipformer2TransducerModel::RunEncoder(Ort::Value features,
+                                           std::vector<Ort::Value> states,
+                                           Ort::Value /* processed_frames */) {
+  std::vector<Ort::Value> encoder_inputs;
+  encoder_inputs.reserve(1 + states.size());
+
+  encoder_inputs.push_back(std::move(features));
+  for (auto &v : states) {
+    encoder_inputs.push_back(std::move(v));
+  }
+
+  auto encoder_out = encoder_sess_->Run(
+      {}, encoder_input_names_ptr_.data(), encoder_inputs.data(),
+      encoder_inputs.size(), encoder_output_names_ptr_.data(),
+      encoder_output_names_ptr_.size());
+
+  std::vector<Ort::Value> next_states;
+  next_states.reserve(states.size());
+
+  for (int32_t i = 1; i != static_cast<int32_t>(encoder_out.size()); ++i) {
+    next_states.push_back(std::move(encoder_out[i]));
+  }
+  return {std::move(encoder_out[0]), std::move(next_states)};
+}
+
+Ort::Value OnlineZipformer2TransducerModel::RunDecoder(
+    Ort::Value decoder_input) {
+  auto decoder_out = decoder_sess_->Run(
+      {}, decoder_input_names_ptr_.data(), &decoder_input, 1,
+      decoder_output_names_ptr_.data(), decoder_output_names_ptr_.size());
+  return std::move(decoder_out[0]);
+}
+
+Ort::Value OnlineZipformer2TransducerModel::RunJoiner(Ort::Value encoder_out,
+                                                     Ort::Value decoder_out) {
+  std::array<Ort::Value, 2> joiner_input = {std::move(encoder_out),
+                                            std::move(decoder_out)};
+  auto logit =
+      joiner_sess_->Run({}, joiner_input_names_ptr_.data(), joiner_input.data(),
+                        joiner_input.size(), joiner_output_names_ptr_.data(),
+                        joiner_output_names_ptr_.size());
+
+  return std::move(logit[0]);
+}
+
+}  // namespace sherpa_onnx
diff --git a/sherpa-onnx/csrc/online-zipformer2-transducer-model.h b/sherpa-onnx/csrc/online-zipformer2-transducer-model.h
new file mode 100644
index 00000000..57b63e02
--- /dev/null
+++ b/sherpa-onnx/csrc/online-zipformer2-transducer-model.h
@@ -0,0 +1,109 @@
+// sherpa-onnx/csrc/online-zipformer2-transducer-model.h
+//
+// Copyright (c)  2023  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_ONLINE_ZIPFORMER2_TRANSDUCER_MODEL_H_
+#define SHERPA_ONNX_CSRC_ONLINE_ZIPFORMER2_TRANSDUCER_MODEL_H_
+
+#include <memory>
+#include <string>
+#include <utility>
+#include <vector>
+
+#if __ANDROID_API__ >= 9
+#include "android/asset_manager.h"
+#include "android/asset_manager_jni.h"
+#endif
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/online-transducer-model-config.h"
+#include "sherpa-onnx/csrc/online-transducer-model.h"
+
+namespace sherpa_onnx {
+
+class OnlineZipformer2TransducerModel : public OnlineTransducerModel {
+ public:
+  explicit OnlineZipformer2TransducerModel(
+      const OnlineTransducerModelConfig &config);
+
+#if __ANDROID_API__ >= 9
+  OnlineZipformer2TransducerModel(AAssetManager *mgr,
+                                 const OnlineTransducerModelConfig &config);
+#endif
+
+  std::vector<Ort::Value> StackStates(
+      const std::vector<std::vector<Ort::Value>> &states) const override;
+
+  std::vector<std::vector<Ort::Value>> UnStackStates(
+      const std::vector<Ort::Value> &states) const override;
+
+  std::vector<Ort::Value> GetEncoderInitStates() override;
+
+  std::pair<Ort::Value, std::vector<Ort::Value>> RunEncoder(
+      Ort::Value features, std::vector<Ort::Value> states,
+      Ort::Value processed_frames) override;
+
+  Ort::Value RunDecoder(Ort::Value decoder_input) override;
+
+  Ort::Value RunJoiner(Ort::Value encoder_out, Ort::Value decoder_out) override;
+
+  int32_t ContextSize() const override { return context_size_; }
+
+  int32_t ChunkSize() const override { return T_; }
+
+  int32_t ChunkShift() const override { return decode_chunk_len_; }
+
+  int32_t VocabSize() const override { return vocab_size_; }
+  OrtAllocator *Allocator() override { return allocator_; }
+
+ private:
+  void InitEncoder(void *model_data, size_t model_data_length);
+  void InitDecoder(void *model_data, size_t model_data_length);
+  void InitJoiner(void *model_data, size_t model_data_length);
+
+ private:
+  Ort::Env env_;
+  Ort::SessionOptions sess_opts_;
+  Ort::AllocatorWithDefaultOptions allocator_;
+
+  std::unique_ptr<Ort::Session> encoder_sess_;
+  std::unique_ptr<Ort::Session> decoder_sess_;
+  std::unique_ptr<Ort::Session> joiner_sess_;
+
+  std::vector<std::string> encoder_input_names_;
+  std::vector<const char *> encoder_input_names_ptr_;
+
+  std::vector<std::string> encoder_output_names_;
+  std::vector<const char *> encoder_output_names_ptr_;
+
+  std::vector<std::string> decoder_input_names_;
+  std::vector<const char *> decoder_input_names_ptr_;
+
+  std::vector<std::string> decoder_output_names_;
+  std::vector<const char *> decoder_output_names_ptr_;
+
+  std::vector<std::string> joiner_input_names_;
+  std::vector<const char *> joiner_input_names_ptr_;
+
+  std::vector<std::string> joiner_output_names_;
+  std::vector<const char *> joiner_output_names_ptr_;
+
+  OnlineTransducerModelConfig config_;
+
+  std::vector<int32_t> encoder_dims_;
+  std::vector<int32_t> query_head_dims_;
+  std::vector<int32_t> value_head_dims_;
+  std::vector<int32_t> num_heads_;
+  std::vector<int32_t> num_encoder_layers_;
+  std::vector<int32_t> cnn_module_kernels_;
+  std::vector<int32_t> left_context_len_;
+
+  int32_t T_ = 0;
+  int32_t decode_chunk_len_ = 0;
+
+  int32_t context_size_ = 0;
+  int32_t vocab_size_ = 0;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_ONLINE_ZIPFORMER2_TRANSDUCER_MODEL_H_