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title: ARB System Rename
date: 2026-05-18
context: System renamed from MORPH to ARB (Any Relational Bit)
---
# ARB System — Rename Note
## New Name
The system has been renamed from **MORPH** to **ARB** (Any Relational Bit).
- **ARB** = Any Relational Bit — the core ternary architecture
- **ARBS** = ARB System — the full software system
- **ARBitor** = The Python package name (`arbitor/`)
## Package Structure
All core system files now live under `arbitor/`:
```
models/Trigram/
├── arbitor/ # Core ARB system package
│ ├── __init__.py # Public API exports
│ ├── trigram.py # Core model (ARBModel replaces MORPHTernaryModel)
│ ├── tscale.py # Ternary scale tensors
│ ├── convert_to_ternary.py # 5-trit packing
│ ├── convert_to_ternary*.py # Legacy converters
│ ├── flash_vq.py # FlashVQ codebook
│ ├── ternary_audit.py # Model state auditor
│ ├── profiling.py # Profiling utilities
│ ├── train.py # Training pipeline
│ ├── optim/
│ │ └── sign_sgd.py # SignSGD optimizer
│ └── encoders/ # Float sidecar encoders
│ ├── __init__.py
│ ├── audio_codec.py
│ ├── audio_vq_encoder.py
│ └── video_vae.py
├── testing/ # Tests (import from arbitor)
├── .planning/ # Planning docs (P0-P10 complete)
├── TRUE-TERNARY-REFACTOR*.md # Architecture refactor notes
├── BENCHMARK.md # Benchmark docs
└── benchmark_true_ternary.py # Benchmark scripts
```
## Import Changes
| Before | After |
|--------|-------|
| `from trigram import ARBModel` | `from arbitor.trigram import ARBModel` |
| `from tscale import TernaryScaleTensor` | `from arbitor.tscale import TernaryScaleTensor` |
| `from optim.sign_sgd import SignSGD` | `from arbitor.optim.sign_sgd import SignSGD` |
| `from encoders.video_vae import load_vae` | `from arbitor.encoders.video_vae import load_vae` |
| `from arbitor import ARBModel` | Shorthand via `arbitor/__init__.py` |
| `import trigram` | `from arbitor import trigram` |
## Class Rename
| Before | After |
|--------|-------|
| `MORPHTernaryModel` | `ARBModel` |
|