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https://github.com/infiniflow/ragflow.git
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69264b3a70
### What problem does this PR solve? ### Type of change - [x] New Feature (non-breaking change which adds functionality) - [x] Refactoring --------- Co-authored-by: Zhichang Yu <yuzhichang@gmail.com> Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
95 lines
3.0 KiB
Python
95 lines
3.0 KiB
Python
#
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# Copyright 2025 The InfiniFlow 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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from common.token_utils import num_tokens_from_string
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from rag.flow.chunker.title_chunker.common import (
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BaseTitleChunker,
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resolve_target_level,
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)
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MIN_GROUP_TOKENS = 32
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MAX_GROUP_TOKENS = 1024
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def _build_section_ids(levels, target_level):
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sec_ids = []
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sid = 0
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for i, level in enumerate(levels):
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if target_level is not None and level <= target_level and i > 0:
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sid += 1
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sec_ids.append(sid)
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return sec_ids
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def _resolve_group_target_level(levels, hierarchy, most_level):
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if hierarchy and int(hierarchy) > 0:
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return resolve_target_level(levels, hierarchy)
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return most_level
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class GroupTitleChunker(BaseTitleChunker):
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start_message = "Start to group by title levels."
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def resolve_levels(self, line_records):
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return self.resolve_title_levels(line_records)
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def build_chunks(self, line_records, resolved):
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target_level = _resolve_group_target_level(
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resolved["levels"],
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self.param.hierarchy,
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resolved["most_level"],
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)
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sec_ids = _build_section_ids(resolved["levels"], target_level)
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record_groups = []
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tk_cnt = 0
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last_sid = -2
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# The merge state is driven by (current section id, current token size).
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# A chunk stays open while records remain in the same logical section,
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# except that very small chunks are allowed to absorb the next record
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# regardless of section change.
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for record, sec_id in zip(line_records, sec_ids):
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if record["doc_type_kwd"] != "text":
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record_groups.append([record])
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tk_cnt = 0
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last_sid = -2
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continue
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text = record["text"]
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if not text.strip():
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continue
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token_count = num_tokens_from_string(text)
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should_merge = (
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record_groups
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and record_groups[-1][0]["doc_type_kwd"] == "text"
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and (
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tk_cnt < MIN_GROUP_TOKENS
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or (tk_cnt < MAX_GROUP_TOKENS and sec_id == last_sid)
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)
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)
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if should_merge:
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record_groups[-1].append(record)
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tk_cnt += token_count
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else:
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record_groups.append([record])
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tk_cnt = token_count
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last_sid = sec_id
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return self.build_chunks_from_record_groups(record_groups)
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