20010582393

Committed 07 Dec 2025 09:22PM UTC coverage: 90.299% (-0.02%) from 90.316%

Build # 20010582393

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github

Committed by

bramp

Commit Message

refactor(classifiers): use BBox helpers filter_contained and filter_overlapping

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/src/build_a_long/pdf_extract/classifier/classifier.py

"""
Rule-based classifier for labeling page elements.

Pipeline order and dependencies
--------------------------------
The classification pipeline operates in two main phases:

1. **Bottom-up Scoring**: All classifiers run independently to identify potential
   candidates (e.g. page numbers, part counts, step numbers) and score them based
   on heuristics. No construction of final elements happens here.

2. **Top-down Construction**: The root `PageClassifier` is invoked to construct
   the final `Page` object. It recursively requests the construction of its
   dependencies (e.g. "Give me the best PageNumber"), which in turn construct
   their own dependencies. This ensures a consistent and validated object tree.

"""

from __future__ import annotations

import logging

from build_a_long.pdf_extract.classifier.bags import (
    BagNumberClassifier,
    NewBagClassifier,
)
from build_a_long.pdf_extract.classifier.batch_classification_result import (
    BatchClassificationResult,
)
from build_a_long.pdf_extract.classifier.block_filter import (
    filter_background_blocks,
    filter_duplicate_blocks,
    filter_overlapping_text_blocks,
)
from build_a_long.pdf_extract.classifier.classification_result import (
    ClassificationResult,
)
from build_a_long.pdf_extract.classifier.classifier_config import ClassifierConfig
from build_a_long.pdf_extract.classifier.pages import (
    PageHintCollection,
)
from build_a_long.pdf_extract.classifier.pages.divider_classifier import (
    DividerClassifier,
)
from build_a_long.pdf_extract.classifier.pages.page_classifier import PageClassifier
from build_a_long.pdf_extract.classifier.pages.page_number_classifier import (
    PageNumberClassifier,
)
from build_a_long.pdf_extract.classifier.pages.progress_bar_classifier import (
    ProgressBarClassifier,
)
from build_a_long.pdf_extract.classifier.parts import (
    PartCountClassifier,
    PartNumberClassifier,
    PartsClassifier,
    PartsImageClassifier,
    PartsListClassifier,
    PieceLengthClassifier,
    ShineClassifier,
)
from build_a_long.pdf_extract.classifier.removal_reason import RemovalReason
from build_a_long.pdf_extract.classifier.steps import (
    ArrowClassifier,
    DiagramClassifier,
    RotationSymbolClassifier,
    StepClassifier,
    StepCountClassifier,
    StepNumberClassifier,
    SubAssemblyClassifier,
)
from build_a_long.pdf_extract.classifier.text import FontSizeHints, TextHistogram
from build_a_long.pdf_extract.classifier.topological_sort import topological_sort
from build_a_long.pdf_extract.extractor import PageData
from build_a_long.pdf_extract.extractor.bbox import filter_contained
from build_a_long.pdf_extract.extractor.lego_page_elements import (
    PageNumber,
    PartCount,
    PartsList,
    StepNumber,
)
from build_a_long.pdf_extract.extractor.page_blocks import Blocks

logger = logging.getLogger(__name__)

# Pages with more blocks than this threshold will be skipped during classification.
# This avoids O(n²) algorithms (like duplicate detection) that become prohibitively
# slow on pages with thousands of vector drawings. Such pages are typically info
# pages where each character is a separate vector graphic.
# TODO: Add spatial indexing to handle high-block pages efficiently.
MAX_BLOCKS_PER_PAGE = 1000


# TODO require config, so we don't accidentally use default empty config
def classify_elements(
    page: PageData, config: ClassifierConfig | None = None
) -> ClassificationResult:
    """Classify and label elements on a single page using rule-based heuristics.

    Args:
        page: A single PageData object to classify.
        config: Optional classifier configuration with font/page hints.
            If None, uses default empty configuration (no hints).
            For better classification accuracy, pass a config with
            FontSizeHints computed from multiple pages of the same PDF.

    Returns:
        A ClassificationResult object containing the classification results.
    """
    if config is None:
        config = ClassifierConfig()
    classifier = Classifier(config)

    return classifier.classify(page)


def classify_pages(
    pages: list[PageData], pages_for_hints: list[PageData] | None = None
) -> BatchClassificationResult:
    """Classify and label elements across multiple pages using rule-based heuristics.

    This function performs a three-phase process:
    1. Filtering phase: Mark duplicate/similar blocks as removed on each page
    2. Analysis phase: Build font size hints from text properties (excluding
       removed blocks)
    3. Classification phase: Use hints to guide element classification

    Args:
        pages: A list of PageData objects to classify.
        pages_for_hints: Optional list of pages to use for generating font/page hints.
            If None, uses `pages`. This allows generating hints from all pages
            while only classifying a subset (e.g., when using --pages filter).

    Returns:
        BatchClassificationResult containing per-page results and global histogram
    """

    # TODO There is a bunch of duplication in here between hints and non-hints. Refactor

    # Use all pages for hint generation if provided, otherwise use selected pages
    hint_pages = pages_for_hints if pages_for_hints is not None else pages

    # Phase 1: Filter duplicate blocks on each page and track removals
    # Skip pages with too many blocks to avoid O(n²) performance issues
    removed_blocks_per_page: list[dict[Blocks, RemovalReason]] = []
    skipped_pages: set[int] = set()  # Track page numbers that are skipped

    for page_data in pages:
        # Skip pages with too many blocks - these are likely info/inventory pages
        # with vectorized text that cause O(n²) algorithms to be very slow
        if len(page_data.blocks) > MAX_BLOCKS_PER_PAGE:
            logger.debug(
                f"Page {page_data.page_number}: skipping classification "
                f"({len(page_data.blocks)} blocks exceeds threshold of "
                f"{MAX_BLOCKS_PER_PAGE})"
            )
            skipped_pages.add(page_data.page_number)
            removed_blocks_per_page.append({})
            continue

        kept_blocks = page_data.blocks

        # Filter background blocks (full page blocks like background images)
        kept_blocks, background_removed = filter_background_blocks(
            kept_blocks, page_data.bbox.width, page_data.bbox.height
        )

        # Filter overlapping text blocks (e.g., "4" and "43" at same origin)
        kept_blocks, text_removed = filter_overlapping_text_blocks(kept_blocks)

        # Filter duplicate image/drawing blocks based on IOU
        kept_blocks, bbox_removed = filter_duplicate_blocks(kept_blocks)

        # Combine all removal mappings into a single dict for this page
        combined_removed_mapping = {
            **text_removed,
            **bbox_removed,
            **background_removed,
        }

        logger.debug(
            f"Page {page_data.page_number}: "
            f"filtered {len(text_removed)} overlapping text, "
            f"{len(bbox_removed)} duplicate bbox blocks, "
            f"{len(background_removed)} background blocks"
        )

        removed_blocks_per_page.append(combined_removed_mapping)

    # Phase 2: Extract font size hints from hint pages (excluding removed blocks)
    # Build pages with non-removed blocks for hint extraction and histogram

    # Filter duplicates from hint pages (may be different from pages to classify)
    hint_pages_without_duplicates = []
    for page_data in hint_pages:
        # Skip high-block pages for hints too (same threshold)
        if len(page_data.blocks) > MAX_BLOCKS_PER_PAGE:
            continue

        # TODO We are re-filtering duplicates here; optimize by changing the API
        # to accept one list of PageData, and seperate by page_numbers.
        kept_blocks = page_data.blocks
        kept_blocks, _ = filter_background_blocks(
            kept_blocks, page_data.bbox.width, page_data.bbox.height
        )
        kept_blocks, _ = filter_overlapping_text_blocks(kept_blocks)
        kept_blocks, _ = filter_duplicate_blocks(kept_blocks)

        hint_pages_without_duplicates.append(
            PageData(
                page_number=page_data.page_number,
                bbox=page_data.bbox,
                blocks=kept_blocks,
            )
        )

    # Build pages without duplicates for classification
    pages_without_duplicates = []
    for page_data, removed_mapping in zip(pages, removed_blocks_per_page, strict=True):
        # We need to filter blocks that were removed by ANY filter
        non_removed_blocks = [
            block for block in page_data.blocks if block not in removed_mapping
        ]
        pages_without_duplicates.append(
            PageData(
                page_number=page_data.page_number,
                bbox=page_data.bbox,
                blocks=non_removed_blocks,
            )
        )

    # Generate hints from hint pages, histogram from pages to classify
    font_size_hints = FontSizeHints.from_pages(hint_pages_without_duplicates)
    page_hints = PageHintCollection.from_pages(hint_pages_without_duplicates)
    histogram = TextHistogram.from_pages(pages_without_duplicates)

    # Phase 3: Classify using the hints (on pages without duplicates)
    config = ClassifierConfig(font_size_hints=font_size_hints, page_hints=page_hints)
    classifier = Classifier(config)

    results = []
    for page_data, page_without_duplicates, removed_mapping in zip(
        pages, pages_without_duplicates, removed_blocks_per_page, strict=True
    ):
        # Handle skipped pages
        if page_data.page_number in skipped_pages:
            result = ClassificationResult(
                page_data=page_data,
                skipped_reason=(
                    f"Page has {len(page_data.blocks)} blocks, which exceeds "
                    f"the threshold of {MAX_BLOCKS_PER_PAGE}. This is likely an "
                    f"info/inventory page with vectorized text."
                ),
            )
            results.append(result)
            continue

        # Classify using only non-removed blocks
        result = classifier.classify(page_without_duplicates)

        # Update result to use original page_data (with all blocks)
        result.page_data = page_data

        # Mark removed blocks
        for removed_block, removal_reason in removed_mapping.items():
            result.mark_removed(removed_block, removal_reason)

        results.append(result)

    return BatchClassificationResult(results=results, histogram=histogram)


type Classifiers = (
    PageNumberClassifier
    | ProgressBarClassifier
    | DividerClassifier
    | BagNumberClassifier
    | PartCountClassifier
    | PartNumberClassifier
    | StepNumberClassifier
    | StepCountClassifier
    | PieceLengthClassifier
    | PartsClassifier
    | PartsListClassifier
    | PartsImageClassifier
    | ShineClassifier
    | NewBagClassifier
    | DiagramClassifier
    | ArrowClassifier
    | SubAssemblyClassifier
    | StepClassifier
    | PageClassifier
)


class Classifier:
    """
    Performs a single run of classification based on rules, configuration, and hints.
    This class should be stateless.
    """

    def __init__(self, config: ClassifierConfig):
        self.config = config
        # Sort classifiers topologically based on their dependencies
        self.classifiers = topological_sort(
            [
                PageNumberClassifier(config=config),
                ProgressBarClassifier(config=config),
                DividerClassifier(config=config),
                BagNumberClassifier(config=config),
                PartCountClassifier(config=config),
                PartNumberClassifier(config=config),
                StepNumberClassifier(config=config),
                StepCountClassifier(config=config),
                PieceLengthClassifier(config=config),
                PartsClassifier(config=config),
                PartsListClassifier(config=config),
                DiagramClassifier(config=config),
                RotationSymbolClassifier(config=config),
                ArrowClassifier(config=config),
                PartsImageClassifier(config=config),
                ShineClassifier(config=config),
                NewBagClassifier(config=config),
                SubAssemblyClassifier(config=config),
                StepClassifier(config=config),
                PageClassifier(config=config),
            ]
        )

    def classify(self, page_data: PageData) -> ClassificationResult:
        """
        Runs the classification logic and returns a result.
        It does NOT modify page_data directly.

        The classification process runs in three phases:
        1. Score all classifiers (bottom-up) - auto-registers classifiers
        2. Construct final elements (top-down starting from Page)
        """
        result = ClassificationResult(page_data=page_data)

        logger.debug(f"Starting classification for page {page_data.page_number}")

        # 1. Score all classifiers (Bottom-Up)
        # Note: score() automatically registers each classifier for its output labels
        for classifier in self.classifiers:
            classifier.score(result)

        # 2. Construct (Top-Down)
        # Find the PageClassifier to start the construction process
        page_classifier = next(
            c for c in self.classifiers if isinstance(c, PageClassifier)
        )
        page_classifier.build_all(result)

        # TODO Do we actualy ever add warnings?
        warnings = self._log_post_classification_warnings(page_data, result)
        for warning in warnings:
            result.add_warning(warning)

        return result

    def _log_post_classification_warnings(
        self, page_data: PageData, result: ClassificationResult
    ) -> list[str]:
        warnings = []

        # Check if there's a page number
        page_numbers = result.get_winners_by_score("page_number", PageNumber)
        if not page_numbers:
            warnings.append(f"Page {page_data.page_number}: missing page number")

        # Get elements by label
        parts_lists = result.get_winners_by_score("parts_list", PartsList)
        part_counts = result.get_winners_by_score("part_count", PartCount)

        for pl in parts_lists:
            inside_counts = filter_contained(part_counts, pl.bbox)
            if not inside_counts:
                warnings.append(
                    f"Page {page_data.page_number}: parts list at {pl.bbox} "
                    f"contains no part counts"
                )

        steps = result.get_winners_by_score("step_number", StepNumber)
        ABOVE_EPS = 2.0
        for step in steps:
            sb = step.bbox
            above = [pl for pl in parts_lists if pl.bbox.y1 <= sb.y0 + ABOVE_EPS]
            if not above:
                warnings.append(
                    f"Page {page_data.page_number}: step number '{step.value}' "
                    f"at {sb} has no parts list above it"
                )
        return warnings

1	"""
2	Rule-based classifier for labeling page elements.
3
4	Pipeline order and dependencies
5	--------------------------------
6	The classification pipeline operates in two main phases:
7
8	1. Bottom-up Scoring: All classifiers run independently to identify potential
9	candidates (e.g. page numbers, part counts, step numbers) and score them based
10	on heuristics. No construction of final elements happens here.
11
12	2. Top-down Construction: The root `PageClassifier` is invoked to construct
13	the final `Page` object. It recursively requests the construction of its
14	dependencies (e.g. "Give me the best PageNumber"), which in turn construct
15	their own dependencies. This ensures a consistent and validated object tree.
16
17	"""
18
19	from __future__ import annotations	1✔
20
21	import logging	1✔
22
23	from build_a_long.pdf_extract.classifier.bags import (	1✔
24	BagNumberClassifier,
25	NewBagClassifier,
26	)
27	from build_a_long.pdf_extract.classifier.batch_classification_result import (	1✔
28	BatchClassificationResult,
29	)
30	from build_a_long.pdf_extract.classifier.block_filter import (	1✔
31	filter_background_blocks,
32	filter_duplicate_blocks,
33	filter_overlapping_text_blocks,
34	)
35	from build_a_long.pdf_extract.classifier.classification_result import (	1✔
36	ClassificationResult,
37	)
38	from build_a_long.pdf_extract.classifier.classifier_config import ClassifierConfig	1✔
39	from build_a_long.pdf_extract.classifier.pages import (	1✔
40	PageHintCollection,
41	)
42	from build_a_long.pdf_extract.classifier.pages.divider_classifier import (	1✔
43	DividerClassifier,
44	)
45	from build_a_long.pdf_extract.classifier.pages.page_classifier import PageClassifier	1✔
46	from build_a_long.pdf_extract.classifier.pages.page_number_classifier import (	1✔
47	PageNumberClassifier,
48	)
49	from build_a_long.pdf_extract.classifier.pages.progress_bar_classifier import (	1✔
50	ProgressBarClassifier,
51	)
52	from build_a_long.pdf_extract.classifier.parts import (	1✔
53	PartCountClassifier,
54	PartNumberClassifier,
55	PartsClassifier,
56	PartsImageClassifier,
57	PartsListClassifier,
58	PieceLengthClassifier,
59	ShineClassifier,
60	)
61	from build_a_long.pdf_extract.classifier.removal_reason import RemovalReason	1✔
62	from build_a_long.pdf_extract.classifier.steps import (	1✔
63	ArrowClassifier,
64	DiagramClassifier,
65	RotationSymbolClassifier,
66	StepClassifier,
67	StepCountClassifier,
68	StepNumberClassifier,
69	SubAssemblyClassifier,
70	)
71	from build_a_long.pdf_extract.classifier.text import FontSizeHints, TextHistogram	1✔
72	from build_a_long.pdf_extract.classifier.topological_sort import topological_sort	1✔
73	from build_a_long.pdf_extract.extractor import PageData	1✔
74	from build_a_long.pdf_extract.extractor.bbox import filter_contained	1✔
75	from build_a_long.pdf_extract.extractor.lego_page_elements import (	1✔
76	PageNumber,
77	PartCount,
78	PartsList,
79	StepNumber,
80	)
81	from build_a_long.pdf_extract.extractor.page_blocks import Blocks	1✔
82
83	logger = logging.getLogger(__name__)	1✔
84
85	# Pages with more blocks than this threshold will be skipped during classification.
86	# This avoids O(n²) algorithms (like duplicate detection) that become prohibitively
87	# slow on pages with thousands of vector drawings. Such pages are typically info
88	# pages where each character is a separate vector graphic.
89	# TODO: Add spatial indexing to handle high-block pages efficiently.
90	MAX_BLOCKS_PER_PAGE = 1000	1✔
91
92
93	# TODO require config, so we don't accidentally use default empty config
94	def classify_elements(	1✔
95	page: PageData, config: ClassifierConfig \| None = None
96	) -> ClassificationResult:
97	"""Classify and label elements on a single page using rule-based heuristics.
98
99	Args:
100	page: A single PageData object to classify.
101	config: Optional classifier configuration with font/page hints.
102	If None, uses default empty configuration (no hints).
103	For better classification accuracy, pass a config with
104	FontSizeHints computed from multiple pages of the same PDF.
105
106	Returns:
107	A ClassificationResult object containing the classification results.
108	"""
109	if config is None:	1✔
110	config = ClassifierConfig()	1✔
111	classifier = Classifier(config)	1✔
112
113	return classifier.classify(page)	1✔
114
115
116	def classify_pages(	1✔
117	pages: list[PageData], pages_for_hints: list[PageData] \| None = None
118	) -> BatchClassificationResult:
119	"""Classify and label elements across multiple pages using rule-based heuristics.
120
121	This function performs a three-phase process:
122	1. Filtering phase: Mark duplicate/similar blocks as removed on each page
123	2. Analysis phase: Build font size hints from text properties (excluding
124	removed blocks)
125	3. Classification phase: Use hints to guide element classification
126
127	Args:
128	pages: A list of PageData objects to classify.
129	pages_for_hints: Optional list of pages to use for generating font/page hints.
130	If None, uses `pages`. This allows generating hints from all pages
131	while only classifying a subset (e.g., when using --pages filter).
132
133	Returns:
134	BatchClassificationResult containing per-page results and global histogram
135	"""
136
137	# TODO There is a bunch of duplication in here between hints and non-hints. Refactor
138
139	# Use all pages for hint generation if provided, otherwise use selected pages
140	hint_pages = pages_for_hints if pages_for_hints is not None else pages	1✔
141
142	# Phase 1: Filter duplicate blocks on each page and track removals
143	# Skip pages with too many blocks to avoid O(n²) performance issues
144	removed_blocks_per_page: list[dict[Blocks, RemovalReason]] = []	1✔
145	skipped_pages: set[int] = set() # Track page numbers that are skipped	1✔
146
147	for page_data in pages:	1✔
148	# Skip pages with too many blocks - these are likely info/inventory pages
149	# with vectorized text that cause O(n²) algorithms to be very slow
150	if len(page_data.blocks) > MAX_BLOCKS_PER_PAGE:	1✔
151	logger.debug(	1✔
152	f"Page {page_data.page_number}: skipping classification "
153	f"({len(page_data.blocks)} blocks exceeds threshold of "
154	f"{MAX_BLOCKS_PER_PAGE})"
155	)
156	skipped_pages.add(page_data.page_number)	1✔
157	removed_blocks_per_page.append({})	1✔
158	continue	1✔
159
160	kept_blocks = page_data.blocks	1✔
161
162	# Filter background blocks (full page blocks like background images)
163	kept_blocks, background_removed = filter_background_blocks(	1✔
164	kept_blocks, page_data.bbox.width, page_data.bbox.height
165	)
166
167	# Filter overlapping text blocks (e.g., "4" and "43" at same origin)
168	kept_blocks, text_removed = filter_overlapping_text_blocks(kept_blocks)	1✔
169
170	# Filter duplicate image/drawing blocks based on IOU
171	kept_blocks, bbox_removed = filter_duplicate_blocks(kept_blocks)	1✔
172
173	# Combine all removal mappings into a single dict for this page
174	combined_removed_mapping = {	1✔
175	**text_removed,
176	**bbox_removed,
177	**background_removed,
178	}
179
180	logger.debug(	1✔
181	f"Page {page_data.page_number}: "
182	f"filtered {len(text_removed)} overlapping text, "
183	f"{len(bbox_removed)} duplicate bbox blocks, "
184	f"{len(background_removed)} background blocks"
185	)
186
187	removed_blocks_per_page.append(combined_removed_mapping)	1✔
188
189	# Phase 2: Extract font size hints from hint pages (excluding removed blocks)
190	# Build pages with non-removed blocks for hint extraction and histogram
191
192	# Filter duplicates from hint pages (may be different from pages to classify)
193	hint_pages_without_duplicates = []	1✔
194	for page_data in hint_pages:	1✔
195	# Skip high-block pages for hints too (same threshold)
196	if len(page_data.blocks) > MAX_BLOCKS_PER_PAGE:	1✔
197	continue	1✔
198
199	# TODO We are re-filtering duplicates here; optimize by changing the API
200	# to accept one list of PageData, and seperate by page_numbers.
201	kept_blocks = page_data.blocks	1✔
202	kept_blocks, _ = filter_background_blocks(	1✔
203	kept_blocks, page_data.bbox.width, page_data.bbox.height
204	)
205	kept_blocks, _ = filter_overlapping_text_blocks(kept_blocks)	1✔
206	kept_blocks, _ = filter_duplicate_blocks(kept_blocks)	1✔
207
208	hint_pages_without_duplicates.append(	1✔
209	PageData(
210	page_number=page_data.page_number,
211	bbox=page_data.bbox,
212	blocks=kept_blocks,
213	)
214	)
215
216	# Build pages without duplicates for classification
217	pages_without_duplicates = []	1✔
218	for page_data, removed_mapping in zip(pages, removed_blocks_per_page, strict=True):	1✔
219	# We need to filter blocks that were removed by ANY filter
220	non_removed_blocks = [	1✔
221	block for block in page_data.blocks if block not in removed_mapping
222	]
223	pages_without_duplicates.append(	1✔
224	PageData(
225	page_number=page_data.page_number,
226	bbox=page_data.bbox,
227	blocks=non_removed_blocks,
228	)
229	)
230
231	# Generate hints from hint pages, histogram from pages to classify
232	font_size_hints = FontSizeHints.from_pages(hint_pages_without_duplicates)	1✔
233	page_hints = PageHintCollection.from_pages(hint_pages_without_duplicates)	1✔
234	histogram = TextHistogram.from_pages(pages_without_duplicates)	1✔
235
236	# Phase 3: Classify using the hints (on pages without duplicates)
237	config = ClassifierConfig(font_size_hints=font_size_hints, page_hints=page_hints)	1✔
238	classifier = Classifier(config)	1✔
239
240	results = []	1✔
241	for page_data, page_without_duplicates, removed_mapping in zip(	1✔
242	pages, pages_without_duplicates, removed_blocks_per_page, strict=True
243	):
244	# Handle skipped pages
245	if page_data.page_number in skipped_pages:	1✔
246	result = ClassificationResult(	1✔
247	page_data=page_data,
248	skipped_reason=(
249	f"Page has {len(page_data.blocks)} blocks, which exceeds "
250	f"the threshold of {MAX_BLOCKS_PER_PAGE}. This is likely an "
251	f"info/inventory page with vectorized text."
252	),
253	)
254	results.append(result)	1✔
255	continue	1✔
256
257	# Classify using only non-removed blocks
258	result = classifier.classify(page_without_duplicates)	1✔
259
260	# Update result to use original page_data (with all blocks)
261	result.page_data = page_data	1✔
262
263	# Mark removed blocks
264	for removed_block, removal_reason in removed_mapping.items():	1✔
265	result.mark_removed(removed_block, removal_reason)	1✔
266
267	results.append(result)	1✔
268
269	return BatchClassificationResult(results=results, histogram=histogram)	1✔
270
271
272	type Classifiers = (	1✔
273	PageNumberClassifier
274	\| ProgressBarClassifier
275	\| DividerClassifier
276	\| BagNumberClassifier
277	\| PartCountClassifier
278	\| PartNumberClassifier
279	\| StepNumberClassifier
280	\| StepCountClassifier
281	\| PieceLengthClassifier
282	\| PartsClassifier
283	\| PartsListClassifier
284	\| PartsImageClassifier
285	\| ShineClassifier
286	\| NewBagClassifier
287	\| DiagramClassifier
288	\| ArrowClassifier
289	\| SubAssemblyClassifier
290	\| StepClassifier
291	\| PageClassifier
292	)
293
294
295	class Classifier:	1✔
296	"""
297	Performs a single run of classification based on rules, configuration, and hints.
298	This class should be stateless.
299	"""
300
301	def __init__(self, config: ClassifierConfig):	1✔
302	self.config = config	1✔
303	# Sort classifiers topologically based on their dependencies
304	self.classifiers = topological_sort(	1✔
305	[
306	PageNumberClassifier(config=config),
307	ProgressBarClassifier(config=config),
308	DividerClassifier(config=config),
309	BagNumberClassifier(config=config),
310	PartCountClassifier(config=config),
311	PartNumberClassifier(config=config),
312	StepNumberClassifier(config=config),
313	StepCountClassifier(config=config),
314	PieceLengthClassifier(config=config),
315	PartsClassifier(config=config),
316	PartsListClassifier(config=config),
317	DiagramClassifier(config=config),
318	RotationSymbolClassifier(config=config),
319	ArrowClassifier(config=config),
320	PartsImageClassifier(config=config),
321	ShineClassifier(config=config),
322	NewBagClassifier(config=config),
323	SubAssemblyClassifier(config=config),
324	StepClassifier(config=config),
325	PageClassifier(config=config),
326	]
327	)
328
329	def classify(self, page_data: PageData) -> ClassificationResult:	1✔
330	"""
331	Runs the classification logic and returns a result.
332	It does NOT modify page_data directly.
333
334	The classification process runs in three phases:
335	1. Score all classifiers (bottom-up) - auto-registers classifiers
336	2. Construct final elements (top-down starting from Page)
337	"""
338	result = ClassificationResult(page_data=page_data)	1✔
339
340	logger.debug(f"Starting classification for page {page_data.page_number}")	1✔
341
342	# 1. Score all classifiers (Bottom-Up)
343	# Note: score() automatically registers each classifier for its output labels
344	for classifier in self.classifiers:	1✔
345	classifier.score(result)	1✔
346
347	# 2. Construct (Top-Down)
348	# Find the PageClassifier to start the construction process
349	page_classifier = next(	1✔
350	c for c in self.classifiers if isinstance(c, PageClassifier)
351	)
352	page_classifier.build_all(result)	1✔
353
354	# TODO Do we actualy ever add warnings?
355	warnings = self._log_post_classification_warnings(page_data, result)	1✔
356	for warning in warnings:	1✔
357	result.add_warning(warning)	1✔
358
359	return result	1✔
360
361	def _log_post_classification_warnings(	1✔
362	self, page_data: PageData, result: ClassificationResult
363	) -> list[str]:
364	warnings = []	1✔
365
366	# Check if there's a page number
367	page_numbers = result.get_winners_by_score("page_number", PageNumber)	1✔
368	if not page_numbers:	1✔
369	warnings.append(f"Page {page_data.page_number}: missing page number")	1✔
370
371	# Get elements by label
372	parts_lists = result.get_winners_by_score("parts_list", PartsList)	1✔
373	part_counts = result.get_winners_by_score("part_count", PartCount)	1✔
374
375	for pl in parts_lists:	1✔
376	inside_counts = filter_contained(part_counts, pl.bbox)	1✔
377	if not inside_counts:	1✔
UNCOV 378	warnings.append(	×
379	f"Page {page_data.page_number}: parts list at {pl.bbox} "
380	f"contains no part counts"
381	)
382
383	steps = result.get_winners_by_score("step_number", StepNumber)	1✔
384	ABOVE_EPS = 2.0	1✔
385	for step in steps:	1✔
386	sb = step.bbox	1✔
387	above = [pl for pl in parts_lists if pl.bbox.y1 <= sb.y0 + ABOVE_EPS]	1✔
388	if not above:	1✔
389	warnings.append(	1✔
390	f"Page {page_data.page_number}: step number '{step.value}' "
391	f"at {sb} has no parts list above it"
392	)
393	return warnings	1✔

bramp / build-along / 20010582393

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