Add C++ runtime for speaker verification models from NeMo (#527)

sherpa-onnx/csrc/speaker-embedding-extractor-nemo-model.h

@@ -0,0 +1,40 @@
+// sherpa-onnx/csrc/speaker-embedding-extractor-nemo-model.h
+//
+// Copyright (c)  2024  Xiaomi Corporation
+#ifndef SHERPA_ONNX_CSRC_SPEAKER_EMBEDDING_EXTRACTOR_NEMO_MODEL_H_
+#define SHERPA_ONNX_CSRC_SPEAKER_EMBEDDING_EXTRACTOR_NEMO_MODEL_H_
+
+#include <memory>
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/speaker-embedding-extractor-nemo-model-meta-data.h"
+#include "sherpa-onnx/csrc/speaker-embedding-extractor.h"
+
+namespace sherpa_onnx {
+
+class SpeakerEmbeddingExtractorNeMoModel {
+ public:
+  explicit SpeakerEmbeddingExtractorNeMoModel(
+      const SpeakerEmbeddingExtractorConfig &config);
+
+  ~SpeakerEmbeddingExtractorNeMoModel();
+
+  const SpeakerEmbeddingExtractorNeMoModelMetaData &GetMetaData() const;
+
+  /**
+   * @param x A float32 tensor of shape (N, C, T)
+   * @param x_len A int64 tensor of shape (N,)
+   * @return A float32 tensor of shape (N, C)
+   */
+  Ort::Value Compute(Ort::Value x, Ort::Value x_len) const;
+
+  OrtAllocator *Allocator() const;
+
+ private:
+  class Impl;
+  std::unique_ptr<Impl> impl_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_SPEAKER_EMBEDDING_EXTRACTOR_NEMO_MODEL_H_