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145 lines
6.0 KiB
Python
145 lines
6.0 KiB
Python
"""
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# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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from collections.abc import Sequence
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from typing import Optional, Union
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from fastdeploy.entrypoints.openai.protocol import (ChatCompletionRequest,
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DeltaMessage)
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from fastdeploy.reasoning import ReasoningParser, ReasoningParserManager
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@ReasoningParserManager.register_module("qwen3")
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class Qwen3ReasoningParser(ReasoningParser):
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"""
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Reasoning parser for ernir_vl model.
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The ernie_vl model uses ...</think>... tokens to denote reasoning text
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within its output. The model provides a strict switch to disable reasoning
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output via the 'enable_thinking=False' parameter. This parser extracts the
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reasoning content enclosed by <think> and </think> tokens from the model's
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output.
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"""
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def __init__(self, tokenizer):
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super().__init__(tokenizer)
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self.think_start_token = "<think>"
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self.think_end_token = "</think>"
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if not self.model_tokenizer:
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raise ValueError(
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"The model tokenizer must be passed to the ReasoningParser "
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"constructor during construction.")
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self.think_start_token_id = self.vocab.get(self.think_start_token)
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self.think_end_token_id = self.vocab.get(self.think_end_token)
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if self.think_end_token_id is None:
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raise RuntimeError(
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"Qwen3 reasoning parser could not locate think end "
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"tokens in the tokenizer!")
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def extract_reasoning_content_streaming(
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self,
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previous_text: str,
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current_text: str,
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delta_text: str,
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previous_token_ids: Sequence[int],
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current_token_ids: Sequence[int],
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delta_token_ids: Sequence[int],
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) -> Union[DeltaMessage, None]:
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"""
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Extract reasoning content from a delta message.
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Handles streaming output where previous + delta = current.
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Uses token IDs for faster processing.
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For text abc</think>xyz:
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- 'abc' goes to reasoning_content
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- 'xyz' goes to content
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"""
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# Skip single special tokens
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if len(delta_token_ids) == 1 and (delta_token_ids[0] in [
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self.think_start_token_id, self.think_end_token_id
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]):
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return "", ""
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if self.think_start_token_id in previous_token_ids:
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if self.think_end_token_id in delta_token_ids:
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# <think> in previous, </think> in delta,
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# extract reasoning content
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end_index = delta_text.find(self.think_end_token)
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reasoning_content = delta_text[:end_index]
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content = delta_text[end_index + len(self.think_end_token):]
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content = content if content else None
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return reasoning_content, content
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elif self.think_end_token_id in previous_token_ids:
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# <think> in previous, </think> in previous,
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# reasoning content continues
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return "", delta_text
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else:
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# <think> in previous, no </think> in previous or delta,
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# reasoning content continues
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return delta_text, ""
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elif self.think_start_token_id in delta_token_ids:
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if self.think_end_token_id in delta_token_ids:
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# <think> in delta, </think> in delta, extract reasoning content
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start_index = delta_text.find(self.think_start_token)
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end_index = delta_text.find(self.think_end_token)
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reasoning_content = delta_text[start_index +
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len(self.think_start_token
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):end_index]
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content = delta_text[end_index + len(self.think_end_token):]
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content = content if content else None
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return reasoning_content, content
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else:
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# <think> in delta, no </think> in delta,
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# reasoning content continues
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return delta_text, ""
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else:
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# thinking is disabled, just content
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return "", delta_text
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def extract_reasoning_content(
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self, model_output: str, request: ChatCompletionRequest
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) -> tuple[Optional[str], Optional[str]]:
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"""
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Extract reasoning content from the model output.
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For text abc</think>xyz:
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- 'abc' goes to reasoning_content
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- 'xyz' goes to content
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Returns:
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tuple[Optional[str], Optional[str]]: reasoning content and content
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"""
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# Check if the model output contains the <think> and </think> tokens.
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if (self.think_start_token not in model_output
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or self.think_end_token not in model_output):
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return None, model_output
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# Check if the <think> is present in the model output, remove it
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# if it is present.
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model_output_parts = model_output.partition(self.think_start_token)
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model_output = model_output_parts[2] if model_output_parts[
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1] else model_output_parts[0]
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# Check if the model output contains the </think> tokens.
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# If the end token is not found, return the model output as is.
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if self.think_end_token not in model_output:
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return None, model_output
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# Extract reasoning content from the model output.
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reasoning_content, _, content = model_output.partition(
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self.think_end_token)
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final_content = content or None
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return reasoning_content, final_content |