Add C++ runtime for non-streaming faster conformer transducer from NeMo. (#854)

sherpa-onnx/csrc/offline-transducer-greedy-search-nemo-decoder.h

@@ -0,0 +1,33 @@
+// sherpa-onnx/csrc/offline-transducer-greedy-search-nemo-decoder.h
+//
+// Copyright (c)  2024  Xiaomi Corporation
+
+#ifndef SHERPA_ONNX_CSRC_OFFLINE_TRANSDUCER_GREEDY_SEARCH_NEMO_DECODER_H_
+#define SHERPA_ONNX_CSRC_OFFLINE_TRANSDUCER_GREEDY_SEARCH_NEMO_DECODER_H_
+
+#include <vector>
+
+#include "sherpa-onnx/csrc/offline-transducer-decoder.h"
+#include "sherpa-onnx/csrc/offline-transducer-nemo-model.h"
+
+namespace sherpa_onnx {
+
+class OfflineTransducerGreedySearchNeMoDecoder
+    : public OfflineTransducerDecoder {
+ public:
+  OfflineTransducerGreedySearchNeMoDecoder(OfflineTransducerNeMoModel *model,
+                                           float blank_penalty)
+      : model_(model), blank_penalty_(blank_penalty) {}
+
+  std::vector<OfflineTransducerDecoderResult> Decode(
+      Ort::Value encoder_out, Ort::Value encoder_out_length,
+      OfflineStream **ss = nullptr, int32_t n = 0) override;
+
+ private:
+  OfflineTransducerNeMoModel *model_;  // Not owned
+  float blank_penalty_;
+};
+
+}  // namespace sherpa_onnx
+
+#endif  // SHERPA_ONNX_CSRC_OFFLINE_TRANSDUCER_GREEDY_SEARCH_NEMO_DECODER_H_