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---
license: mit
tags:
- formal-verification
- coq
- threshold-logic
- neuromorphic
---
# tiny-3OutOf8-verified
Formally verified 3-out-of-8 threshold gate. Single threshold neuron with 100% accuracy.
## Architecture
| Component | Value |
|-----------|-------|
| Inputs | 8 |
| Outputs | 1 |
| Neurons | 1 |
| Parameters | 9 |
| Weights | [1, 1, 1, 1, 1, 1, 1, 1] |
| Bias | -3 |
| Activation | Heaviside step |
## Key Properties
- 100% accuracy (256/256 inputs correct)
- Coq-proven correctness
- Single threshold neuron
- Integer weights
- Fires when at least 3 of 8 inputs are true
## Usage
```python
import torch
from safetensors.torch import load_file
weights = load_file('threeoutof8.safetensors')
def threeoutof8_gate(bits):
# bits: list of 8 binary values
inputs = torch.tensor([float(b) for b in bits])
weighted_sum = (inputs * weights['weight']).sum() + weights['bias']
return int(weighted_sum >= 0)
# Test
print({func}_gate([0,0,0,0,0,0,0,0])) # 0 (0/3, below threshold)
print({func}_gate([1,1,0,0,0,0,0,0])) # 0 (2/8, below threshold)
print({func}_gate([1,1,1,0,0,0,0,0])) # 1 (3/8, at threshold)
print(threeoutof8_gate([1,1,1,1,1,1,1,1])) # 1 (8/8, above threshold)
```
## Verification
**Coq Theorem**:
```coq
Theorem threeout_eight_correct : forall x0 x1 x2 x3 x4 x5 x6 x7,
threeout_eight_circuit [x0; x1; x2; x3; x4; x5; x6; x7] =
threeout_eight_spec [x0; x1; x2; x3; x4; x5; x6; x7].
```
Proven axiom-free via:
1. **Exhaustive**: All 256 inputs verified
2. **Universal**: Quantified proof over boolean combinations
3. **Algebraic**: Hamming weight ≥ 3
Full proof: [coq-circuits/Threshold/ThreeOutOfEight.v](https://github.com/CharlesCNorton/coq-circuits/blob/main/coq/Threshold/ThreeOutOfEight.v)
## Circuit Operation
Input with h true bits (Hamming weight h):
- Weighted sum: h - 3
- Output: 1 if h ≥ 3, else 0
## Citation
```bibtex
@software{tiny_3outof8_prover_2025,
title={tiny-3OutOf8-verified: Formally Verified 3-out-of-8 threshold gate},
author={Norton, Charles},
url={https://huggingface.co/phanerozoic/tiny-3OutOf8-verified},
year={2025}
}
```
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