---
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` |