ANLP Assignment 1 — Configuration C5
tokenization: subword -> token-free BLT (raw bytes + patches)
Encoder-decoder Transformer built from basic PyTorch operations (no nn.Transformer or
nn.MultiheadAttention), trained to decrypt binary cipher text into English plaintext.
One of five configurations in a controlled ablation. Each of C2-C5 changes exactly one component from the C1 base; every other hyperparameter is identical across all five runs.
This configuration
| Axis | Setting |
|---|---|
| Positional encoding | sinusoidal |
| Attention | mha |
| Normalization | layernorm |
| Tokenization | byte |
Shared hyperparameters
d_model 256 | 4 encoder layers | 4 decoder layers
8 heads | d_ff 1024 | dropout 0.1 | pre-norm
AdamW lr 0.0003 | warmup 1000 | 15000 steps | batch 64 | seed 42
fp32 (no AMP)
Results
| Metric | Value |
|---|---|
| Bit-level accuracy | 1.0000 |
| Sequence accuracy | 0.9977 |
| Levenshtein distance | 0.00 |
| BLEU | N/A |
| ROUGE-L | N/A |
| Parameters | 10,782,208 |
| Peak GPU memory (MB) | 829.6 |
| Seconds per training step | 0.0759 |
Usage
Checkpoints are plain PyTorch state dicts. See the accompanying code repository for the
model definition; torch.load(...)["model"] loads into build_model(get_config("c5"), ...).
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