Initial commit: E4B-MarkBase model integration with passing tests
CI / build-and-test (push) Has been cancelled
CI / build-and-test (push) Has been cancelled
- E4B-MarkBase model (42 layers, 4.4GB) loaded successfully - All Phase 1-6 tests passed (model loading, forward pass, vision/audio towers, token generation, performance) - All stress tests passed (5/5 in 127.6s) - Concurrent inference - Memory stress (67.5 tok/s, 0 NaN) - Continuous generation - Batch processing - Long-running stability - Swift Metal inference engine with multimodal support
This commit is contained in:
MarkBase Admin
@@ -0,0 +1,217 @@
|
||||
# Day 3 Session Final Summary
|
||||
|
||||
**Date**: 2026-06-23
|
||||
**Duration**: 8+ hours
|
||||
**Status**: ✅ 3/4 Models Production Ready
|
||||
|
||||
---
|
||||
|
||||
## Critical Breakthroughs
|
||||
|
||||
### 1. Thread-Safe FileHandle Fix (Most Important)
|
||||
- **Problem**: Concurrent weight loading → 130 empty reads
|
||||
- **Root Cause**: FileHandle NOT thread-safe (race condition)
|
||||
- **Solution**: NSLock protection in SafeTensorsReader
|
||||
- **File**: `Sources/MarkBase/Weights/SafeTensors.swift:9,65-68`
|
||||
- **Impact**: ALL weights now load correctly (0 empty reads)
|
||||
|
||||
### 2. 26B-A4B Weight Corruption Discovery
|
||||
- **Finding**: ~98% tokenIds affected by NaN (175+80+1-2 each)
|
||||
- **Root Cause**: Weight file corrupted during quantization
|
||||
- **Recommendation**: Use 26B-Standard (identical architecture, zero NaN)
|
||||
|
||||
---
|
||||
|
||||
## Test Results Summary
|
||||
|
||||
### Production Ready Models (NaN=0)
|
||||
| Model | Status | NaN Count | Notes |
|
||||
|-------|--------|-----------|-------|
|
||||
| 26B-Standard | ✅ READY | 0/262144 | 30-layer MoE, 128 experts |
|
||||
| E2B | ✅ READY | 0/262144 | Per-layer embeddings |
|
||||
| 31B | ✅ READY | 0/262144 | Previously verified |
|
||||
|
||||
### Not Ready (Weight Corruption)
|
||||
| Model | Status | NaN Count | Reason |
|
||||
|-------|--------|-----------|--------|
|
||||
| 26B-A4B | ⚠️ CORRUPTED | 175+ NaN | Weight file has NaN scales |
|
||||
|
||||
### Multimodal Tests
|
||||
| Modality | Status | Notes |
|
||||
|----------|--------|-------|
|
||||
| Audio | ✅ PASSED | E4B Audio Multimodal, Buffer isolation verified |
|
||||
| Vision | ✅ PASSED | 12B/E2B/E4B Vision, 100% success |
|
||||
|
||||
---
|
||||
|
||||
## Session Statistics
|
||||
|
||||
- **Total Fixes**: 8 critical changes
|
||||
1. Thread-safe FileHandle (NSLock)
|
||||
2. Buffer isolation (attnH for TEXT, layerBuffer for Audio)
|
||||
3. cmdBuf phase separation (cmdBuf/cmdBuf2/cmdBuf3)
|
||||
4. MoE auto-detection (router.proj check)
|
||||
5. Layer naming fix (hasPrefix vs contains)
|
||||
6. Dummy MLP strategy (MoE without MLP)
|
||||
7. Weight collection optimization (exclude vision/audio)
|
||||
8. NaN investigation (identify corrupted weights)
|
||||
|
||||
- **Test Reports**: 16 documents
|
||||
- **Models Verified**: 4 TEXT + 3 multimodal
|
||||
- **Production Ready**: 3 TEXT models (26B-Standard, E2B, 31B)
|
||||
|
||||
---
|
||||
|
||||
## Key Learnings
|
||||
|
||||
### 1. FileHandle Thread Safety
|
||||
- **Critical**: FileHandle is NOT thread-safe
|
||||
- **Must use**: Lock protection for concurrent reads
|
||||
- **Evidence**: 130 empty reads before fix → 0 after
|
||||
|
||||
### 2. Weight File Quality
|
||||
- **Lesson**: Check weights for NaN during loading
|
||||
- **Detection**: embedWeight scales/biases can contain NaN
|
||||
- **Prevention**: Add validation step in weight preloading
|
||||
|
||||
### 3. Buffer Isolation
|
||||
- **Rule**: Metal kernel input/output MUST be isolated
|
||||
- **Audio**: layerBuffer (67MB) separate from temps.h
|
||||
- **TEXT**: attnH separate from temps.h
|
||||
|
||||
### 4. Command Buffer Phases
|
||||
- **Pattern**: Embedding→cmdBuf, Layers→cmdBuf2, LM Head→cmdBuf3
|
||||
- **Reason**: Avoid reusing committed command buffers
|
||||
|
||||
---
|
||||
|
||||
## Deployment Recommendations
|
||||
|
||||
### Immediate Actions
|
||||
1. **Deploy 26B-Standard**: TEXT inference production-ready
|
||||
- Path: `/Users/accusys/MarkBaseEngine/models/gemma-4-27b-it-4bit`
|
||||
- Architecture: 30 layers, 128 experts/layer
|
||||
- Status: Zero NaN, thread-safe loading
|
||||
|
||||
2. **Deploy E2B**: TEXT inference production-ready
|
||||
- Path: `/Users/accusys/MarkBaseEngine/models/gemma-4-12b-it-4bit`
|
||||
- Feature: Per-layer embeddings
|
||||
- Status: Zero NaN, Buffer isolation verified
|
||||
|
||||
3. **Deploy Audio Multimodal**: E4B Audio ready
|
||||
- Buffer isolation tested
|
||||
- Audio tower: 513 tensors loaded in 89ms
|
||||
- Vision tower: 439 tensors loaded in 82ms
|
||||
|
||||
### NOT Deploy
|
||||
- **26B-A4B**: Weight file corrupted (~98% tokens affected by NaN)
|
||||
- **Replace with**: 26B-Standard (identical MoE architecture)
|
||||
|
||||
---
|
||||
|
||||
## Future Work
|
||||
|
||||
### Short-term (Next Session)
|
||||
1. Add NaN detection in weight loading
|
||||
2. Implement weight validation (detect corrupted files)
|
||||
3. Test long-context inference (KV cache scaling)
|
||||
4. Optimize inference speed (<100ms/token target)
|
||||
|
||||
### Medium-term
|
||||
1. Re-quantize 26B-A4B from original weights
|
||||
2. Add weight quality metrics (NaN count, scale distribution)
|
||||
3. Implement batched inference (multiple sequences)
|
||||
4. Profile memory usage (optimize for 128GB unified)
|
||||
|
||||
### Long-term
|
||||
1. Deploy full multimodal (Audio+Vision+Text generation)
|
||||
2. Optimize Metal kernels (reduce latency)
|
||||
3. Add streaming inference (continuous generation)
|
||||
4. Production monitoring (NaN alerts, performance tracking)
|
||||
|
||||
---
|
||||
|
||||
## Files Modified
|
||||
|
||||
### Critical Changes
|
||||
1. `Sources/MarkBase/Weights/SafeTensors.swift` - Thread-safe fix
|
||||
2. `Sources/MarkBase/Model.swift` - Weight collection, MoE detection
|
||||
3. `Sources/MarkBase/ModelOptimized.swift` - cmdBuf phase separation
|
||||
4. `Sources/MarkBase/Layers/Layer.swift` - ForwardTemps attnH buffer
|
||||
5. `Sources/MarkBase/Layers/LayerOptimized.swift` - Use attnH buffer
|
||||
|
||||
### Test Coverage
|
||||
- `MoE26BStandardTest.swift` - 26B-Standard verification
|
||||
- `MoE26BA4BTest.swift` - 26B-A4B corruption detection
|
||||
- `MinimalTextLayerTest.swift` - E2B verification
|
||||
- `E4BAudioMultimodalTest.swift` - Audio multimodal
|
||||
- `VisionSeparateTest.swift` - Vision multimodal
|
||||
|
||||
### Reports Generated
|
||||
- `THREAD_SAFE_FIX_REPORT.md` - Thread safety breakthrough
|
||||
- `NAN_INVESTIGATION_REPORT.md` - Weight corruption analysis
|
||||
- `FINAL_SESSION_ACHIEVEMENT_SUMMARY.md` - This document
|
||||
|
||||
---
|
||||
|
||||
## Performance Metrics
|
||||
|
||||
### Weight Loading (After Thread-safe Fix)
|
||||
- 26B-Standard: 1130 weights in 880ms
|
||||
- 26B-A4B: 1335 weights in 794ms
|
||||
- E2B: 1225 weights in 106ms
|
||||
- **Success rate**: 100% (0 errors, 0 empty reads)
|
||||
|
||||
### Forward Pass Speed
|
||||
- E2B: 12.1 tok/s (audio multimodal)
|
||||
- 26B-Standard: ~1-2s per forward (single token)
|
||||
- **Target**: <100ms/token (optimization needed)
|
||||
|
||||
### Memory Usage
|
||||
- E4B Audio: layerBuffer 67MB (isolated)
|
||||
- TEXT: attnH buffer (isolated from temps.h)
|
||||
- KV cache: 128 context → scaling tested
|
||||
|
||||
---
|
||||
|
||||
## Conclusion
|
||||
|
||||
**Day 3 Session: Major Success**
|
||||
|
||||
- ✅ Thread-safe FileHandle fix (enables all model loading)
|
||||
- ✅ 3/4 models production-ready (26B-Standard, E2B, 31B)
|
||||
- ✅ Multimodal tests passed (Audio/Vision)
|
||||
- ⚠️ 26B-A4B weight corruption identified (use 26B-Standard instead)
|
||||
|
||||
**Next Session Goal**: Deploy TEXT inference for production use cases
|
||||
|
||||
---
|
||||
|
||||
## Quick Reference
|
||||
|
||||
### Production Models
|
||||
```bash
|
||||
# 26B-Standard MoE (RECOMMENDED)
|
||||
/Users/accusys/MarkBaseEngine/models/gemma-4-27b-it-4bit
|
||||
|
||||
# E2B Per-layer
|
||||
/Users/accusys/MarkBaseEngine/models/gemma-4-12b-it-4bit
|
||||
|
||||
# 31B
|
||||
/Users/accusys/MarkBaseEngine/models/gemma-4-31b-it-4bit
|
||||
```
|
||||
|
||||
### NOT Production (Corrupted)
|
||||
```bash
|
||||
# 26B-A4B (DO NOT USE - weight file corrupted)
|
||||
/Users/accusys/MarkBaseEngine/models/gemma-4-26b-a4b-it-4bit
|
||||
```
|
||||
|
||||
### Key Code Locations
|
||||
- Thread-safe fix: `SafeTensors.swift:65-68`
|
||||
- Buffer isolation: `Layer.swift:73`, `LayerOptimized.swift:87`
|
||||
- cmdBuf phases: `ModelOptimized.swift:12,30,100`
|
||||
|
||||
---
|
||||
|
||||
**End of Day 3 Session**
|
||||
Reference in New Issue
Block a user