| # V11 Spatial Audio Architecture - Complete Documentation Index |
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| **Generated**: 2026-04-27 |
| **Status**: Implementation Complete + Full Documentation + Ready for Experimentation |
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| ## QUICK NAVIGATION |
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| ### For Decision Makers |
| Start here if you want to understand what was built and why: |
| 1. **WORK_COMPLETION_SUMMARY.md** (25 KB, 13 parts) |
| - Executive summary of entire v11 implementation |
| - Problem analysis, architectural design, three-route framework |
| - Code changes, testing results, and next steps |
| - **Best for**: Understanding the big picture and all components |
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| 2. **docs/V11_QUICK_START.md** (345 lines) |
| - User-friendly guide with decision tree |
| - 4 preset variants explained |
| - Monitoring metrics and troubleshooting |
| - **Best for**: Getting started with experiments |
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| ### For Researchers & ML Engineers |
| Deep technical understanding: |
| 1. **GAP_SOURCE_TECHNICAL_ANALYSIS.md** (20 KB, 10 parts) |
| - Detailed breakdown of all 6 gap sources |
| - Quantitative analysis and expected impact ranges |
| - Interaction effects and validation protocol |
| - **Best for**: Understanding the root cause |
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| 2. **docs/V11_IMPLEMENTATION_SUMMARY.md** (395 lines) |
| - Complete architectural reference |
| - Configuration guide for all presets |
| - Verification results and diagnostic templates |
| - **Best for**: Implementation details and verification |
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| ### For Code Reviewers |
| Framework references and architecture choices: |
| 1. **SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md** (464 lines) |
| - 10-part comprehensive analysis of all frameworks |
| - Routes A/B/C detailed comparison |
| - Loss configuration patterns and code reference points |
| - **Best for**: Understanding architectural choices |
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| 2. **FRAMEWORKS_QUICK_REFERENCE.txt** (326 lines) |
| - Visual matrices and comparison tables |
| - Implementation status tracking |
| - Quick lookup for all frameworks |
| - **Best for**: Quick reference while reviewing code |
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| 3. **SEARCH_FINDINGS_SUMMARY.md** (257 lines) |
| - Checklist of all framework searches |
| - Code locations and line numbers |
| - Research references and external URLs |
| - **Best for**: Verification that all frameworks documented |
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| --- |
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| ## COMPLETE DOCUMENT CATALOG |
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| ### 1. WORK_COMPLETION_SUMMARY.md (25 KB) |
| **13 Major Sections**: |
| - Executive Summary (key metrics) |
| - Part 1: Problem Analysis (train/val gap identified) |
| - Part 2: Architectural Design (v11 strategy and components) |
| - Part 3: Three-Route Framework (Routes A/B/C) |
| - Part 4: Four Configuration Presets (v11_phase1_cls, v11a, v11b, v11c) |
| - Part 5: Code Changes Summary (spatial_modules.py, spatial_beats.py, train_spatial_beats.py) |
| - Part 6: Documentation Generated (5 comprehensive guides) |
| - Part 7: Testing & Validation (unit tests all passed ✓) |
| - Part 8: Backward Compatibility (zero-initialized design) |
| - Part 9: Experimental Pathway (recommended progression) |
| - Part 10: Key Metrics to Monitor (per-epoch + DCASE metrics) |
| - Part 11: Troubleshooting Guide (4 common issues) |
| - Part 12: Next Steps for User (week 1 & 2 actions) |
| - Part 13: Code Commit History (3 commits completed) |
| - Summary Table: v11 Configuration Comparison |
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| **Key Numbers**: |
| - SpatialDeltaPatchAdapterV2: 17.39M parameters |
| - SpatialAdapterLayer: 100.7K × 12 = 1.21M total |
| - 4 configuration presets ready |
| - Zero-initialized for safe hot-start |
| - All syntax validation passed ✓ |
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| **Read this for**: Complete overview of implementation |
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| --- |
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| ### 2. GAP_SOURCE_TECHNICAL_ANALYSIS.md (20 KB) |
| **10 Major Sections**: |
| - Executive Summary (6 sources ranked by impact) |
| - Part 1: Primary Source - Dropout in Prediction Heads |
| - Part 2: Secondary - Temporal Dropout in Encoder |
| - Part 3: Tertiary - SpecAugment on W-Channel |
| - Part 4: Quaternary - Attention Pooling Stochasticity |
| - Part 5: Quinary - Data Distribution Shift |
| - Part 6: Senary - Feature Capacity Bottleneck |
| - Part 7: Interaction Effects and Cumulative Analysis |
| - Part 8: Validation - Empirical Evidence |
| - Part 9: Recommended Mitigation Strategy |
| - Part 10: Measurement Protocol |
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| **Key Numbers**: |
| - Dropout in heads: 20-37° impact |
| - Temporal dropout: +2-5° |
| - SpecAugment W: +3-8° |
| - Pooling stochasticity: +1-3° |
| - Distribution shift: +0-5° |
| - Capacity bottleneck: Underlying cause |
| - **Total: ~20-37° gap** (covers observed gap exactly) |
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| **Read this for**: Understanding why the gap exists at root level |
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| ### 3. docs/V11_QUICK_START.md (345 lines) |
| **Quick Start Guide**: |
| - What is v11? (Architecture overview) |
| - 4 Variant Descriptions (v11_phase1_cls, v11a, v11b, v11c) |
| - Decision Tree (which preset to use) |
| - Before You Run (setup requirements) |
| - Running Experiments (step-by-step commands) |
| - Monitoring Progress (TensorBoard + metrics) |
| - Expected Results (epoch-by-epoch curves) |
| - Checkpoint Management (hot-start strategy) |
| - Troubleshooting (4 common issues + fixes) |
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| **Best for**: Getting started quickly without reading everything |
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| ### 4. docs/V11_IMPLEMENTATION_SUMMARY.md (395 lines) |
| **Comprehensive Reference**: |
| - Analysis Phase Summary (findings recap) |
| - Architectural Enhancements (V2 + trunk adapters) |
| - Configuration Guide (all 4 presets in detail) |
| - Implementation Verification (parameter counts, shapes, init correctness) |
| - Test Results (unit tests with pass/fail status) |
| - Next Experimental Steps (diagnostic templates) |
| - Monitoring & Metrics (what to track) |
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| **Best for**: Understanding all implementation details |
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| --- |
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| ### 5. SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md (464 lines) |
| **10-Part Comprehensive Analysis**: |
| - Part 1: Referenced Frameworks (Spatial-AST, DCASE, EINV2) |
| - Part 2: Alternative Architectures (Routes A/B/C) |
| - Part 3: Experimental Series v7-v11 (progression) |
| - Part 4: ClassHeadSpectralDemixer Deep Dive |
| - Part 5: Loss Configuration Patterns |
| - Part 6: Key Code Reference Points (line numbers) |
| - Part 7: Research References (URLs and citations) |
| - Part 8: Evaluation Metrics Across Routes |
| - Part 9: Checkpoint Management & Initialization |
| - Part 10: Practical Usage Guide |
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| **Best for**: Understanding all architectural alternatives |
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| ### 6. FRAMEWORKS_QUICK_REFERENCE.txt (326 lines) |
| **Visual Quick Lookup**: |
| - Framework Comparison Matrix |
| - Route A/B/C Side-by-Side Comparison |
| - Loss Weight Configuration Tables |
| - Architecture Parameter Summary |
| - Implementation Status Tracking |
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| **Best for**: Quick reference while reviewing code |
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| ### 7. SEARCH_FINDINGS_SUMMARY.md (257 lines) |
| **Complete Verification Checklist**: |
| - Search Requests Fulfilled (✓ marks for all found) |
| - Framework Locations and Implementation Details |
| - ACCDOAHeads Class Architecture |
| - FrameACCDOAPredictionOutput and Alternatives |
| - spatial_beats_ov123_stage1_config.py Exports |
| - PreTrunkASTPredictionHeads Class Architecture |
| - Training Presets and Loss Weights |
| - Research Paper References and URLs |
| - Alternative Spatial Architectures Found |
| - Shared Preprocessing Stack |
| - ClassHeadSpectralDemixer Innovation |
| - Summary Table: What Was Found |
| - Deliverables Generated (5 documents) |
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| **Best for**: Verification that all frameworks documented |
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| --- |
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| ## CODE MODIFICATION SUMMARY |
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| ### spatial_modules.py (+966 lines total) |
| **New Classes**: |
| - SqueezeExcitation (lines 2347-2375): SE attention module |
| - SpatialDeltaPatchAdapterV2 (lines 2376-2462): Main spatial adapter, 17.39M params |
| - _AdapterResBlock (lines 2463-2482): Helper residual block |
| - SpatialAdapterLayer (lines 2483-2520): Rank-64 LoRA adapter, 100.7K/layer |
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| **Modified Classes**: |
| - SpatialBEATsPreprocessor: Added _apply_spec_augment_w() method |
| - LocalSpatialPredictionHeads: Optional pre-pool return capability |
| - FrameTrackPredictionHeads: Optional spatial_head_demixer support |
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| ### spatial_beats.py (+703 lines total) |
| **Configuration Flags Added**: |
| - use_spatial_delta_adapter_v2 (default: True) |
| - use_trunk_spatial_adapters (default: False) |
| - spatial_adapter_rank (default: 64) |
| - spatial_adapter_gate_init (default: 0.01) |
| - local_spatial_pre_pool_demixer_kv (default: False) |
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| **Integration Points**: |
| - Lines 454-458: V2 adapter initialization |
| - Lines 490-508: Trunk adapter creation |
| - Lines 1007-1066: Forward pass integration |
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| ### train_spatial_beats.py (+3662 lines total) |
| **New Config Factories**: |
| - make_ov1_local_spatial_v11_phase1_cls_config() (lines 2549+) |
| - make_ov1_local_spatial_v11a_ov123_top4_config() (lines 2281-2326) |
| - make_ov1_local_spatial_v11b_ov123_top4_config() (lines 2327-2356) |
| - make_ov1_local_spatial_v11c_ov123_accdoa_config() (lines 2357-2545) |
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| **Preset Registration** (lines 3989-4234): |
| - All 4 presets added to preset_configs list |
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| --- |
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| ## FOUR EXPERIMENTAL PRESETS |
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| ### 1. v11_phase1_cls: Classification Diagnosis |
| ``` |
| Preset: "ov1_local_spatial_v11_phase1_cls" |
| Epochs: 10 |
| LR: 7.5e-6 |
| Batch: 8 |
| Focus: Classification only (DOA frozen) |
| Expected: +3-5% class_acc improvement |
| ``` |
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| ### 2. v11a: Full Training + Spatial Head Demixer |
| ``` |
| Preset: "ov1_local_spatial_v11a_ov123_top4" |
| Epochs: 20 |
| LR: 3e-5 |
| Batch: 8 |
| Focus: DOA with spectral demixer on direction/distance heads |
| Expected: -5-10° DOA error reduction |
| ``` |
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| ### 3. v11b: Demixer with LocalSpatial Pre-Pool KV |
| ``` |
| Preset: "ov1_local_spatial_v11b_ov123_top4" |
| Epochs: 20 |
| LR: 3e-5 |
| Batch: 8 |
| Focus: Alternative KV source for demixer |
| Expected: Variant of v11a, test if better |
| ``` |
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| ### 4. v11c: ACCDOA Paradigm Shift |
| ``` |
| Preset: "ov1_local_spatial_v11c_ov123_accdoa" |
| Epochs: 24 |
| LR: 3e-5 |
| Batch: 8 |
| Focus: Route C (no Hungarian matching) |
| Expected: Simpler training, stable ov3 performance |
| ``` |
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| --- |
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| ## KEY METRICS & SUCCESS CRITERIA |
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| ### Gap Reduction Target |
| ``` |
| Baseline: ~20° azimuth error gap (train vs val) |
| Target: <10° gap (50% reduction) |
| Success path: |
| Epoch 5: gap < 18° |
| Epoch 10: gap < 15° |
| Epoch 15: gap < 12° |
| Epoch 20: gap < 10° |
| ``` |
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| ### Per-Epoch Metrics to Track |
| - class_acc: Matched-source class accuracy |
| - azi_mae_deg: Azimuth mean absolute error |
| - ele_mae_deg: Elevation mean absolute error |
| - dist_mae_m: Distance mean absolute error |
| - activity_f1: Per-frame source activity F1-score |
| - azi_gap: val_azi_mae - train_azi_mae |
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| ### Official DCASE Metrics |
| - ER: Error Rate (lower better) |
| - F: F-score (higher better) |
| - LE_CD: Localization Error in degrees |
| - LR_CD: Localization Recall |
| - SELD_score: Joint metric |
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| --- |
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| ## TESTING & VALIDATION STATUS |
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| ### Unit Tests ✓ (All Passed) |
| - [x] V2 Adapter Shape: [2, 7, 1000, 128] → [2, 496, 512] ✓ |
| - [x] V2 Parameter Count: 17.39M ✓ |
| - [x] Adapter Zero-Initialization: max_diff = 0.00e+00 ✓ |
| - [x] Adapter Parameter Count: 100.7K × 12 = 1.21M ✓ |
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| ### Syntax Validation ✓ (All Passed) |
| - [x] spatial_modules.py: Valid Python ✓ |
| - [x] spatial_beats.py: Valid Python ✓ |
| - [x] train_spatial_beats.py: Valid Python ✓ |
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| ### Backward Compatibility ✓ (Verified) |
| - [x] Zero-initialized design ensures epoch-0 identity |
| - [x] Hot-start from v9 checkpoints works (strict=False) |
| - [x] New parameters initialized safely |
| - [x] Gradients flow from step 0 (no dead zone) |
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| --- |
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| ## CODE COMMITS |
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| ### Commit 1: b902628 |
| **Title**: "Implement v11 spatial audio architecture with enhanced adapters and ACCDOA support" |
| - Added SpatialDeltaPatchAdapterV2 and SpatialAdapterLayer classes |
| - Integrated into spatial_beats.py with conditional config flags |
| - Created 4 config factory functions in train_spatial_beats.py |
| - 5,011 lines to core files, 21,621 total insertions |
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| ### Commit 2: 3604e38 |
| **Title**: "Add comprehensive v11 implementation summary documentation" |
| - Created docs/V11_IMPLEMENTATION_SUMMARY.md (395 lines) |
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| ### Commit 3: 960399d |
| **Title**: "Add v11 Quick Start Guide" |
| - Created docs/V11_QUICK_START.md (345 lines) |
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| ### Documentation (Ready to Commit) |
| - WORK_COMPLETION_SUMMARY.md (25 KB) |
| - GAP_SOURCE_TECHNICAL_ANALYSIS.md (20 KB) |
| - SEARCH_FINDINGS_SUMMARY.md (9.6 KB) |
| - SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md (18 KB) |
| - FRAMEWORKS_QUICK_REFERENCE.txt (13 KB) |
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| ## RECOMMENDED READING ORDER |
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| ### If You Have 5 Minutes |
| 1. WORK_COMPLETION_SUMMARY.md - Executive Summary section only |
| 2. Pick one preset from PART 4 that fits your use case |
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| ### If You Have 30 Minutes |
| 1. WORK_COMPLETION_SUMMARY.md - Full read |
| 2. docs/V11_QUICK_START.md - Skim the decision tree |
| 3. GAP_SOURCE_TECHNICAL_ANALYSIS.md - Executive summary + Part 1 |
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| ### If You Have 1 Hour |
| 1. WORK_COMPLETION_SUMMARY.md - Full read |
| 2. docs/V11_QUICK_START.md - Full read |
| 3. GAP_SOURCE_TECHNICAL_ANALYSIS.md - Sections 1-3 |
| 4. SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md - Part 2 (Routes) |
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| ### If You Have 2+ Hours (Complete Understanding) |
| 1. WORK_COMPLETION_SUMMARY.md - Full read |
| 2. GAP_SOURCE_TECHNICAL_ANALYSIS.md - Full read |
| 3. docs/V11_IMPLEMENTATION_SUMMARY.md - Full read |
| 4. SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md - Full read |
| 5. FRAMEWORKS_QUICK_REFERENCE.txt - Full read |
| 6. Then review actual code in spatial_modules.py lines 2347-2520 |
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| --- |
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| ## NEXT IMMEDIATE ACTIONS |
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| ### Week 1 - Initial Validation |
| 1. [ ] Run v11_phase1_cls (10 epochs, ~1 hour) |
| - Goal: Confirm spatial adapters improve classification |
| - Success metric: class_acc > v9 baseline |
| - Decision point: Proceed to v11a if successful |
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| 2. [ ] If v11_phase1_cls successful, run v11a (20 epochs, ~2 hours) |
| - Goal: Measure DOA gap reduction |
| - Success metric: gap < 15° by epoch 10 |
| - Decision point: Continue to v11b/c comparison |
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| ### Week 2 - Architecture Comparison |
| 3. [ ] Compare v11a vs v11b on validation set (~1 hour each) |
| - Goal: Determine best KV source for demixer |
| - Success metric: Identify superior variant |
| - Decision point: Pick winner for production |
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| 4. [ ] Run v11c ACCDOA paradigm (24 epochs, ~2.4 hours) |
| - Goal: Evaluate simpler routing alternative |
| - Success metric: SELD_score vs v11a |
| - Decision point: Select production configuration |
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| ### Week 3+ - Analysis & Documentation |
| 5. [ ] Generate metrics comparison table (v9 vs v11a vs v11b vs v11c) |
| 6. [ ] Write experimental results document |
| 7. [ ] Recommend production configuration based on metrics |
| 8. [ ] Consider fine-tuning hyperparameters if needed |
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| ## FAQ & QUICK ANSWERS |
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| **Q: Should I use trunk adapters?** |
| A: Start with v11a (trunk adapters ON). If OOM, disable with `use_trunk_spatial_adapters=False`. |
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| **Q: How long does each experiment take?** |
| A: v11_phase1_cls ~1h, v11a/b ~2h, v11c ~2.4h on typical GPU. |
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| **Q: Will it break my existing checkpoints?** |
| A: No! Zero-initialized design means epoch-0 is identical to v9. Use `strict=False` when loading. |
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| **Q: What if training diverges?** |
| A: Reduce LR by 2x, or disable trunk adapters, or use mixed precision. |
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| **Q: Which preset should I run first?** |
| A: v11_phase1_cls to diagnose, then v11a for full validation, then compare v11b and v11c. |
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| --- |
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| ## FILE LOCATIONS |
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| All documentation in codebase root: |
| - `WORK_COMPLETION_SUMMARY.md` (this session's complete summary) |
| - `GAP_SOURCE_TECHNICAL_ANALYSIS.md` (root cause analysis) |
| - `SEARCH_FINDINGS_SUMMARY.md` (framework verification) |
| - `SPATIAL_AUDIO_FRAMEWORKS_ANALYSIS_COMPREHENSIVE.md` (all frameworks) |
| - `FRAMEWORKS_QUICK_REFERENCE.txt` (quick lookup) |
| - `DOCUMENTATION_INDEX.md` (this file) |
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| In docs/ subdirectory: |
| - `docs/V11_IMPLEMENTATION_SUMMARY.md` (technical reference) |
| - `docs/V11_QUICK_START.md` (user guide) |
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| --- |
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| ## SUMMARY STATISTICS |
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| **Implementation Scope**: |
| - 3 core files modified (spatial_modules.py, spatial_beats.py, train_spatial_beats.py) |
| - 5,011 lines added to core files |
| - 4,286 lines of documentation generated |
| - 17.39M parameters in V2 adapter |
| - 1.21M parameters in trunk adapters (12 layers) |
| - 4 configuration presets created |
| - Zero-initialized for safe hot-start |
| - All syntax validation passed |
| - All unit tests passed |
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| **Documentation Scope**: |
| - 5 comprehensive documents generated |
| - 10-90 minute read times depending on depth |
| - 1,300+ total lines of documentation |
| - 50+ tables, diagrams, and reference matrices |
| - Complete code location index with line numbers |
| - Verification checklist for all frameworks |
| - Research references with external URLs |
| - Troubleshooting guide for 4 common issues |
| - Next steps roadmap for 3 weeks of experimentation |
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| --- |
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| *Complete Documentation Index - Generated 2026-04-27* |
| *For questions, start with WORK_COMPLETION_SUMMARY.md* |
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