CosyVoice/runtime/triton_trtllm/model_repo/cosyvoice2_dit/3/model.py

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import json
import math
import os
import re
import time
from typing import Dict, List, Tuple, Optional, Union
import asyncio
import httpx

import numpy as np
import torch
from torch.utils.dlpack import from_dlpack, to_dlpack
import triton_python_backend_utils as pb_utils
from transformers import AutoTokenizer

import torchaudio


from matcha.utils.audio import mel_spectrogram
from datetime import datetime

ORIGINAL_VOCAB_SIZE = 151663
torch.set_num_threads(1)


def parse_speech_token_string(response_text: str) -> List[int]:
    """
    Parses a string of speech tokens (e.g., "<|s_123|><|s_456|>") into a list of integer IDs.
    """
    speech_tokens = response_text.strip().split('><')
    if len(speech_tokens) > 1:
        # Add back the missing '<' and '>' for proper parsing
        speech_tokens = ['<' + t if not t.startswith('<') else t for t in speech_tokens]
        speech_tokens = [t + '>' if not t.endswith('>') else t for t in speech_tokens]

    speech_ids = []
    for token_str in speech_tokens:
        match = re.match(r'<\|s_(\d+)\|>', token_str)
        if match:
            speech_ids.append(int(match.group(1)))
    return speech_ids


class TritonPythonModel:
    """Triton Python model for Spark TTS.

    This model orchestrates the end-to-end TTS pipeline by coordinating
    between audio tokenizer, LLM, and vocoder components.
    """

    def initialize(self, args):
        """Initialize the model.

        Args:
            args: Dictionary containing model configuration
        """
        self.logger = pb_utils.Logger
        # Parse model parameters
        self.model_config = json.loads(args['model_config'])
        parameters = self.model_config['parameters']
        model_params = {k: v["string_value"] for k, v in parameters.items()}
        self.logger.log_info(f"model_params:{model_params}")
        self.dynamic_chunk_strategy = model_params.get("dynamic_chunk_strategy", "exponential")  # "exponential" or "time_based"
        # self.dynamic_chunk_strategy = "equal"
        self.logger.log_info(f"Using dynamic chunk strategy: {self.dynamic_chunk_strategy}")

        # Initialize tokenizer
        llm_tokenizer_dir = model_params["llm_tokenizer_dir"]
        self.tokenizer = AutoTokenizer.from_pretrained(llm_tokenizer_dir)
        self.prompt_template = "<|sos|>{input_text}<|task_id|>"
        self.eos_token_id = self.tokenizer.convert_tokens_to_ids("<|eos1|>")

        self.device = torch.device("cuda")
        self.decoupled = pb_utils.using_decoupled_model_transaction_policy(self.model_config)

        self.token_frame_rate = 25
        self.flow_pre_lookahead_len = 3
        self.token_hop_len = 15

        spk_info_path = os.path.join(model_params["model_dir"], "spk2info.pt")
        if not os.path.exists(spk_info_path):
            raise ValueError(f"spk2info.pt not found in {model_params['model_dir']}")
        spk_info = torch.load(spk_info_path, map_location="cpu", weights_only=False)
        self.default_spk_info = spk_info["001"]
        self.http_client = httpx.AsyncClient()

    def _convert_speech_tokens_to_str(self, speech_tokens: Union[torch.Tensor, List]) -> str:
        """Converts a tensor or list of speech token IDs to a string representation."""
        if isinstance(speech_tokens, torch.Tensor):
            # Ensure tensor is on CPU and flattened
            speech_tokens = speech_tokens.cpu().numpy().flatten().tolist()

        speech_id_str = ""
        for token_id in speech_tokens:
            # Convert token ID back to the speech number N
            token_num = token_id - ORIGINAL_VOCAB_SIZE
            speech_id_str += f"<|s_{token_num}|>"
        return speech_id_str

    async def forward_llm_async(self, target_text: str, reference_text: str, prompt_speech_tokens: Union[torch.Tensor, List]):
        """
        Asynchronously sends a request to the TRTLLM-serve endpoint and processes the streaming response.
        """
        full_text = f"{reference_text}{target_text}"
        prompt_speech_tokens_str = self._convert_speech_tokens_to_str(prompt_speech_tokens)

        chat = [
            {"role": "user", "content": full_text},
            {"role": "assistant", "content": prompt_speech_tokens_str}
        ]

        payload = {
            "model": "trt_engines_bfloat16",
            "messages": chat,
            "max_tokens": 750,
            "temperature": 0.8,
            "top_p": 0.95,
            "top_k": 50,
            "repetition_penalty": 1.1,
            "stop": ["<|eos1|>", "<|eos|>"],
            "stream": True,
        }

        api_base = "http://localhost:8000/v1/chat/completions"

        buffer = ""
        async with self.http_client.stream("POST", api_base, json=payload, timeout=None) as response:
            print(f"start httpx.AsyncClient, target_text: {target_text[:5]}, time: {datetime.now()}")
            print(f"start response.aiter_lines, target_text: {target_text[:5]}, time: {datetime.now()}")
            response.raise_for_status()
            async for line in response.aiter_lines():
                if line.startswith("data: "):
                    line_data = line[len("data: "):].strip()
                    if line_data == "[DONE]":
                        break
                    try:
                        json_data = json.loads(line_data)
                        content = json_data.get("choices", [{}])[0].get("delta", {}).get("content")
                        if content:
                            buffer += content
                            print(f"buffer: {buffer}, target_text: {target_text[:5]}, time: {datetime.now()}")
                            while True:
                                match = re.search(r"<\|s_(\d+)\|>", buffer)
                                if not match:
                                    break

                                token_num = int(match.group(1))
                                final_id = token_num + ORIGINAL_VOCAB_SIZE
                                yield final_id
                                buffer = buffer[match.end():]
                    except json.JSONDecodeError:
                        self.logger.log_info(f"Skipping non-JSON line: {line_data}")
                        continue

        # Process any remaining complete tokens in the buffer after the stream ends
        while True:
            match = re.search(r"<\|s_(\d+)\|>", buffer)
            if not match:
                break
            token_num = int(match.group(1))
            final_id = token_num + ORIGINAL_VOCAB_SIZE
            yield final_id
            buffer = buffer[match.end():]


    def forward_audio_tokenizer(self, wav, wav_len):
        """Forward pass through the audio tokenizer component.

        Args:
            wav: Input waveform tensor
            wav_len: Waveform length tensor

        Returns:
            Tuple of global and semantic tokens
        """
        inference_request = pb_utils.InferenceRequest(
            model_name='audio_tokenizer',
            requested_output_names=['prompt_speech_tokens'],
            inputs=[wav, wav_len]
        )

        inference_response = inference_request.exec()
        if inference_response.has_error():
            raise pb_utils.TritonModelException(inference_response.error().message())

        # Extract and convert output tensors
        prompt_speech_tokens = pb_utils.get_output_tensor_by_name(inference_response, 'prompt_speech_tokens')
        prompt_speech_tokens = torch.utils.dlpack.from_dlpack(prompt_speech_tokens.to_dlpack()).cpu()

        return prompt_speech_tokens

    def forward_speaker_embedding(self, wav):
        """Forward pass through the speaker embedding component.

        Args:
            wav: Input waveform tensor

        Returns:
            Prompt speaker embedding tensor
        """
        inference_request = pb_utils.InferenceRequest(
            model_name='speaker_embedding',
            requested_output_names=['prompt_spk_embedding'],
            inputs=[pb_utils.Tensor.from_dlpack("reference_wav", to_dlpack(wav))]
        )

        inference_response = inference_request.exec()
        if inference_response.has_error():
            raise pb_utils.TritonModelException(inference_response.error().message())

        # Extract and convert output tensors
        prompt_spk_embedding = pb_utils.get_output_tensor_by_name(inference_response, 'prompt_spk_embedding')
        prompt_spk_embedding = torch.utils.dlpack.from_dlpack(prompt_spk_embedding.to_dlpack())

        return prompt_spk_embedding

    async def forward_token2wav(
            self,
            index: int,
            target_speech_tokens: torch.Tensor,
            request_id: str,
            reference_wav: object,
            reference_wav_len: object,
            finalize: bool = None) -> torch.Tensor:
        """Forward pass through the vocoder component.

        Args:
            prompt_speech_tokens: Prompt speech tokens tensor
            prompt_speech_feat: Prompt speech feat tensor
            prompt_spk_embedding: Prompt spk embedding tensor
            target_speech_tokens: Target speech tokens tensor

        Returns:
            Generated waveform tensor
        """
        target_speech_tokens_tensor = pb_utils.Tensor.from_dlpack("target_speech_tokens", to_dlpack(target_speech_tokens))
        finalize_tensor = pb_utils.Tensor("finalize", np.array([[finalize]], dtype=np.bool_))
        inputs_tensor = [target_speech_tokens_tensor, reference_wav, reference_wav_len, finalize_tensor]
        
        # Create and execute inference request
        inference_request = pb_utils.InferenceRequest(
            model_name='token2wav_dit',
            requested_output_names=[
                "waveform",
            ],
            inputs=inputs_tensor,
            request_id=request_id,
            parameters={"priority": index+1},
        )

        inference_response = await inference_request.async_exec()
        if inference_response.has_error():
            raise pb_utils.TritonModelException(inference_response.error().message())

        # Extract and convert output waveform
        waveform = pb_utils.get_output_tensor_by_name(inference_response, 'waveform')
        waveform = torch.utils.dlpack.from_dlpack(waveform.to_dlpack()).cpu()

        return waveform

    def _extract_speech_feat(self, speech):
        speech_feat = mel_spectrogram(
            speech,
            n_fft=1920,
            num_mels=80,
            sampling_rate=24000,
            hop_size=480,
            win_size=1920,
            fmin=0,
            fmax=8000).squeeze(
            dim=0).transpose(
            0,
            1).to(
                self.device)
        speech_feat = speech_feat.unsqueeze(dim=0)
        return speech_feat

    async def _process_request(self, request):
        request_id = request.request_id()
        # Extract input tensors
        wav = pb_utils.get_input_tensor_by_name(request, "reference_wav")

        # Process reference audio through audio tokenizer
        if wav is not None:
            wav_len = pb_utils.get_input_tensor_by_name(request, "reference_wav_len")
            prompt_speech_tokens = self.forward_audio_tokenizer(wav, wav_len)
            prompt_speech_tokens = prompt_speech_tokens.unsqueeze(0)

            wav_tensor = wav.as_numpy()
            wav_tensor = torch.from_numpy(wav_tensor)[:, :wav_len.as_numpy()[0][0]]
            print(f"wav_tensor: {wav_tensor.shape}, time: {datetime.now()}")
            prompt_speech_resample = torchaudio.transforms.Resample(orig_freq=16000, new_freq=24000)(wav_tensor)
            speech_feat = self._extract_speech_feat(prompt_speech_resample)
            token_len = min(int(speech_feat.shape[1] / 2), prompt_speech_tokens.shape[-1])
            prompt_speech_feat = speech_feat[:, :2 * token_len].contiguous().half()
            prompt_speech_tokens = prompt_speech_tokens[:, :token_len].contiguous()

            reference_text = pb_utils.get_input_tensor_by_name(request, "reference_text").as_numpy()
            reference_text = reference_text[0][0].decode('utf-8')
            # prompt_spk_embedding = self.forward_speaker_embedding(wav_tensor)

            # reference_text = self.default_spk_info["prompt_text"]
            # prompt_speech_tokens = self.default_spk_info["speech_token"] + ORIGINAL_VOCAB_SIZE
            # prompt_speech_feat = None
            # prompt_spk_embedding = None

        else:
            # using pre-cached reference text
            assert False, "using pre-cached reference text is not supported"
            reference_text = self.default_spk_info["prompt_text"]
            prompt_speech_tokens = self.default_spk_info["speech_token"] + ORIGINAL_VOCAB_SIZE
            prompt_speech_feat = None
            prompt_spk_embedding = None

        target_text = pb_utils.get_input_tensor_by_name(request, "target_text").as_numpy()
        target_text = target_text[0][0].decode('utf-8')
        print(f"target_text: {target_text}, time: {datetime.now()}")

        if self.decoupled:
            response_sender = request.get_response_sender()

            semantic_token_ids_arr = []
            token_offset, chunk_index = 0, 0
            start_time = time.time()
            this_token_hop_len = self.token_hop_len
            print(f"start forward_llm_async, target_text: {target_text[:5]}, time: {datetime.now()}")
            async for generated_ids in self.forward_llm_async(
                target_text=target_text,
                reference_text=reference_text,
                prompt_speech_tokens=prompt_speech_tokens,
            ):
                if not generated_ids:
                    break
                semantic_token_ids_arr.append(generated_ids)
                print(f"generated_ids: {generated_ids}, target_text: {target_text[:5]}, time: {datetime.now()}")
                while True:
                    pending_num = len(semantic_token_ids_arr) - token_offset
                    if pending_num >= this_token_hop_len + self.flow_pre_lookahead_len:
                        this_tts_speech_token = semantic_token_ids_arr[token_offset:token_offset + this_token_hop_len + self.flow_pre_lookahead_len]
                        this_tts_speech_token = torch.tensor(this_tts_speech_token).unsqueeze(dim=0).to(torch.int32).to(self.device)
                        print(f"chunk_index: {chunk_index}, target_text: {target_text[:5]}, time: {datetime.now()}")
                        sub_tts_speech = await self.forward_token2wav(
                            chunk_index,
                            this_tts_speech_token, request_id, wav, wav_len, False
                        )
                        print(f"finish token2wav, target_text: {target_text[:5]}, time: {datetime.now()}")
                        audio_tensor = pb_utils.Tensor.from_dlpack("waveform", to_dlpack(sub_tts_speech))
                        inference_response = pb_utils.InferenceResponse(output_tensors=[audio_tensor])
                        response_sender.send(inference_response)

                        token_offset += this_token_hop_len
                        self.logger.log_info(f"chunk_index: {chunk_index}, current_token_hop_len: {this_token_hop_len}")

                        if self.dynamic_chunk_strategy == "exponential":
                            this_token_hop_len = self.token_frame_rate * (2 ** chunk_index)
                        elif self.dynamic_chunk_strategy == "equal":
                            this_token_hop_len = self.token_hop_len
                        elif self.dynamic_chunk_strategy == "time_based":
                            # see https://github.com/qi-hua/async_cosyvoice/blob/main/model.py#L306
                            cost_time = time.time() - start_time
                            duration = token_offset / self.token_frame_rate
                            if chunk_index > 0 and cost_time > 0:
                                avg_chunk_processing_time = cost_time / (chunk_index + 1)
                                if avg_chunk_processing_time > 0:
                                    multiples = (duration - cost_time) / avg_chunk_processing_time
                                    self.logger.log_info(f"multiples: {multiples}")
                                    next_pending_num = len(semantic_token_ids_arr) - token_offset
                                    if multiples > 4:
                                        this_token_hop_len = (next_pending_num // self.token_hop_len + 1) * self.token_hop_len
                                    elif multiples > 2:
                                        this_token_hop_len = (next_pending_num // self.token_hop_len) * self.token_hop_len
                                    else:
                                        this_token_hop_len = self.token_hop_len
                                    this_token_hop_len = max(self.token_hop_len, this_token_hop_len)
                        chunk_index += 1
                    else:
                        break
            
            this_tts_speech_token = torch.tensor(semantic_token_ids_arr[token_offset:]).unsqueeze(dim=0).to(torch.int32).to(self.device)
            sub_tts_speech = await self.forward_token2wav(chunk_index, this_tts_speech_token, request_id, wav, wav_len, True)
            audio_tensor = pb_utils.Tensor.from_dlpack("waveform", to_dlpack(sub_tts_speech))
            inference_response = pb_utils.InferenceResponse(output_tensors=[audio_tensor])
            response_sender.send(inference_response)

            response_sender.send(flags=pb_utils.TRITONSERVER_RESPONSE_COMPLETE_FINAL)
            self.logger.log_info("send tritonserver_response_complete_final to end")
        else:
            raise NotImplementedError("Decoupled mode is not supported")

    async def execute(self, requests):
        """Execute inference on the batched requests.

        Args:
            requests: List of inference requests

        Returns:
            List of inference responses containing generated audio
        """
        tasks = [
            asyncio.create_task(self._process_request(request))
            for request in requests
        ]
        await asyncio.gather(*tasks)
        return None

    def finalize(self):
        self.logger.log_info("Finalizing CosyVoice DIT model")
        if hasattr(self, "http_client"):
            asyncio.run(self.http_client.aclose())