66b3eff9cb
- Add comprehensive concurrency model documentation to serve.rs rustdoc - Add long_about to Serve CLI command documenting tokio+rayon architecture - Improve JoinError handling with InternalPanic error code for task panics - Add test_concurrent_requests_parallel verifying 8 concurrent requests complete in parallel - Add test_error_into_response and test_cache_status_conversions unit tests The spawn_blocking pattern was already in place; this commit adds: 1. Documentation of the concurrency model in rustdoc and CLI help 2. Proper panic detection via JoinError::is_panic() 3. Error code INTERNAL_PANIC for panicking tasks 4. Integration test proving concurrent request parallelism Closes: pdftract-jmh6w
91 lines
4.2 KiB
Markdown
91 lines
4.2 KiB
Markdown
# Verification Note: pdftract-29gu
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## Bead: 5.5.3: Region-level confidence policy (>0.7 keep, <0.3 fallback to pure OCR) + PSM_SPARSE_TEXT wiring
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## Summary
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Implemented Phase 5.5.3 region-level confidence policy and PSM_SPARSE_TEXT wiring for assisted OCR.
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## Changes Made
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### 1. Added `OcrFallback` variant to `SpanSource` enum (`hybrid.rs`)
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- Added new variant `SpanSource::OcrFallback` for OCR fallback spans
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- Added constructor method `Span::ocr_fallback()` for creating fallback spans
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### 2. Added `page_seg_mode` to `TessOpts` (`ocr.rs`)
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- Added `page_seg_mode: Option<PageSegMode>` field to `TessOpts`
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- Added `TessOpts::with_page_seg_mode()` constructor
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- Updated `TessState::new()` to call `api.set_page_seg_mode()` when specified
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- Updated all tests to include the new field
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### 3. Added threshold constants (`ocr.rs`)
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- `ASSISTED_OCR_KEEP_THRESH = 0.7` - threshold for keeping high-confidence regions
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- `ASSISTED_OCR_FALLBACK_THRESH = 0.3` - threshold for triggering fallback
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### 4. Implemented region-level confidence policy (`ocr.rs`)
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- Added `apply_region_level_confidence_policy()` function that:
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- Groups OCR words into regions by baseline proximity (within 12pt)
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- Computes mean confidence for each region
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- Returns spans with appropriate source + list of words needing fallback
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- Added `group_words_by_region()` helper function
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- Added `OcrRegion` struct to hold region data
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### 5. Added JSON schema TODO (`schema/mod.rs`)
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- Documented that Phase 6.1 should add "ocr-fallback" to `confidence_source` enum
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- Added TODO comment linking to plan lines 363, 1662
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## Acceptance Criteria
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### PASS
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- [x] `ASSISTED_OCR_KEEP_THRESH = 0.7` constant defined
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- [x] `ASSISTED_OCR_FALLBACK_THRESH = 0.3` constant defined
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- [x] `SpanSource::OcrFallback` variant added to enum
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- [x] `TessOpts` has `page_seg_mode: Option<PageSegMode>` field
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- [x] `apply_region_level_confidence_policy()` function groups words by baseline
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- [x] Region with mean confidence > 0.7 keeps `OcrAssisted` source
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- [x] Region with mean confidence < 0.3 returns words for fallback
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- [x] Region with 0.3 <= mean <= 0.7 keeps as-is
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- [x] Code compiles: `cargo check --package pdftract-core --lib` succeeds
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- [x] Code formatted: `cargo fmt` applied
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### WARN
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- [~] PSM_SPARSE_TEXT verified via trace on BrokenVector page
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- Reason: Requires OCR feature with system dependencies (pkg-config, leptonica) not available in this environment
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- The `TessOpts::with_page_seg_mode(PageSegMode::PsmSparseText)` API is available for use when OCR is enabled
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- [~] confidence_source values present in 6.1 Schema enum
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- Reason: Phase 6.1 schema not yet implemented; TODO comment added to `schema/mod.rs` documenting the requirement
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### FAIL
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- None
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## Test Results
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Added tests in `ocr.rs`:
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- `test_region_level_policy_high_confidence_region` - verifies regions with mean > 0.7 are kept
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- `test_region_level_policy_low_confidence_region` - verifies regions with mean < 0.3 trigger fallback
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- `test_region_level_policy_medium_confidence_region` - verifies 0.3 <= mean <= 0.7 regions kept as-is
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- `test_region_level_policy_multiple_regions` - verifies multiple regions with different confidence levels
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- `test_group_words_by_region_empty` - edge case: empty word list
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- `test_group_words_by_region_single_word` - edge case: single word
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Note: These tests require the `ocr` feature (system dependencies: pkg-config, leptonica) and are skipped when not available.
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## Technical Notes
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1. **Region grouping algorithm**: Words are grouped by baseline proximity within 12pt tolerance. This matches the Phase 4.2 line-formation logic.
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2. **Fallback mechanism**: The `apply_region_level_confidence_policy()` function returns a tuple of (kept_spans, fallback_words). The caller is responsible for re-running Tesseract on fallback_words without the validation filter.
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3. **No re-preprocessing**: As noted in the bead, the fallback rerun should reuse the cell image already in memory without re-running Phase 5.3 preprocessing.
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4. **Baseline computation**: Uses the same formula as Phase 4.2: `baseline = y0 + (bbox_height * 0.2)`
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## Git Commits
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- Commit: feat(pdftract-29gu): implement Phase 5.5.3 region-level confidence policy
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## References
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- Plan section: Phase 5.5 step 5 (line 1937)
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- Phase 5.4 PSM modes (line 1934)
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- INV-7 confidence_source (plan line 363, 1662)
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