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+# Copyright 2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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+#
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+# Redistribution and use in source and binary forms, with or without
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+# modification, are permitted provided that the following conditions
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+# are met:
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+# * Redistributions of source code must retain the above copyright
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+# notice, this list of conditions and the following disclaimer.
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+# * Redistributions in binary form must reproduce the above copyright
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+# notice, this list of conditions and the following disclaimer in the
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+# documentation and/or other materials provided with the distribution.
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+# * Neither the name of NVIDIA CORPORATION nor the names of its
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+# contributors may be used to endorse or promote products derived
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+# from this software without specific prior written permission.
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+#
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+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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+# OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+import json
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+import torch
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+from torch.utils.dlpack import to_dlpack
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+
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+import triton_python_backend_utils as pb_utils
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+
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+import os
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+import numpy as np
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+import torchaudio.compliance.kaldi as kaldi
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+from cosyvoice.utils.file_utils import convert_onnx_to_trt
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+from cosyvoice.utils.common import TrtContextWrapper
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+import onnxruntime
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+
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+
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+class TritonPythonModel:
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+ """Triton Python model for audio tokenization.
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+
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+ This model takes reference audio input and extracts semantic tokens
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+ using s3tokenizer.
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+ """
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+
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+ def initialize(self, args):
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+ """Initialize the model.
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+
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+ Args:
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+ args: Dictionary containing model configuration
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+ """
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+ # Parse model parameters
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+ parameters = json.loads(args['model_config'])['parameters']
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+ model_params = {k: v["string_value"] for k, v in parameters.items()}
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+
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+ self.device = torch.device("cuda")
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+
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+ model_dir = model_params["model_dir"]
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+ gpu="l20"
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+ enable_trt = True
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+ if enable_trt:
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+ self.load_spk_trt(f'{model_dir}/campplus.{gpu}.fp32.trt',
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+ f'{model_dir}/campplus.onnx',
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+ 1,
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+ False)
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+ else:
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+ campplus_model = f'{model_dir}/campplus.onnx'
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+ option = onnxruntime.SessionOptions()
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+ option.graph_optimization_level = onnxruntime.GraphOptimizationLevel.ORT_ENABLE_ALL
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+ option.intra_op_num_threads = 1
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+ self.spk_model = onnxruntime.InferenceSession(campplus_model, sess_options=option, providers=["CPUExecutionProvider"])
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+
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+ def load_spk_trt(self, spk_model, spk_onnx_model, trt_concurrent=1, fp16=True):
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+ if not os.path.exists(spk_model) or os.path.getsize(spk_model) == 0:
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+ trt_kwargs = self.get_spk_trt_kwargs()
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+ convert_onnx_to_trt(spk_model, trt_kwargs, spk_onnx_model, fp16)
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+ import tensorrt as trt
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+ with open(spk_model, 'rb') as f:
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+ spk_engine = trt.Runtime(trt.Logger(trt.Logger.INFO)).deserialize_cuda_engine(f.read())
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+ assert spk_engine is not None, 'failed to load trt {}'.format(spk_model)
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+ self.spk_model = TrtContextWrapper(spk_engine, trt_concurrent=trt_concurrent, device=self.device)
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+
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+ def get_spk_trt_kwargs(self):
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+ min_shape = [(1, 4, 80)]
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+ opt_shape = [(1, 500, 80)]
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+ max_shape = [(1, 3000, 80)]
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+ input_names = ["input"]
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+ return {'min_shape': min_shape, 'opt_shape': opt_shape, 'max_shape': max_shape, 'input_names': input_names}
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+
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+ def _extract_spk_embedding(self, speech):
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+ feat = kaldi.fbank(speech,
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+ num_mel_bins=80,
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+ dither=0,
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+ sample_frequency=16000)
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+ spk_feat = feat - feat.mean(dim=0, keepdim=True)
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+
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+ if isinstance(self.spk_model, onnxruntime.InferenceSession):
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+ embedding = self.spk_model.run(
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+ None, {self.spk_model.get_inputs()[0].name: spk_feat.unsqueeze(dim=0).cpu().numpy()}
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+ )[0].flatten().tolist()
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+ embedding = torch.tensor([embedding]).to(self.device)
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+ else:
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+ [spk_model, stream], trt_engine = self.spk_model.acquire_estimator()
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+ # NOTE need to synchronize when switching stream
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+ with torch.cuda.device(self.device):
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+ torch.cuda.current_stream().synchronize()
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+ spk_feat = spk_feat.unsqueeze(dim=0).to(self.device)
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+ batch_size = spk_feat.size(0)
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+
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+ with stream:
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+ spk_model.set_input_shape('input', (batch_size, spk_feat.size(1), 80))
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+ embedding = torch.empty((batch_size, 192), device=spk_feat.device)
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+
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+ data_ptrs = [spk_feat.contiguous().data_ptr(),
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+ embedding.contiguous().data_ptr()]
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+ for i, j in enumerate(data_ptrs):
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+
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+ spk_model.set_tensor_address(trt_engine.get_tensor_name(i), j)
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+ # run trt engine
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+ assert spk_model.execute_async_v3(torch.cuda.current_stream().cuda_stream) is True
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+ torch.cuda.current_stream().synchronize()
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+ self.spk_model.release_estimator(spk_model, stream)
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+
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+ return embedding.half()
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+
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+ def execute(self, requests):
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+ """Execute inference on the batched requests.
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+
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+ Args:
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+ requests: List of inference requests
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+
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+ Returns:
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+ List of inference responses containing tokenized outputs
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+ """
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+ responses = []
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+ # Process each request in batch
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+ for request in requests:
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+ # Extract input tensors
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+ wav_array = pb_utils.get_input_tensor_by_name(
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+ request, "reference_wav").as_numpy()
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+ wav_array = torch.from_numpy(wav_array).to(self.device)
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+
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+ embedding = self._extract_spk_embedding(wav_array)
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+
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+
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+ prompt_spk_embedding_tensor = pb_utils.Tensor.from_dlpack(
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+ "prompt_spk_embedding", to_dlpack(embedding))
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+ inference_response = pb_utils.InferenceResponse(
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+ output_tensors=[prompt_spk_embedding_tensor])
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+
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+ responses.append(inference_response)
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+
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+ return responses
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