---
language:
- en
library_name: transformers
pipeline_tag: text-generation
datasets:
- epfml/FineWeb-HQ
- HuggingFaceTB/smollm-corpus
tags:
- causal-lm
- base-model
- muon
- xsa-refresh
- custom-code
- trust-remote-code
---

# BananaMind 2 Pico Test - 50%

This is the **50% checkpoint** of a 900,002-parameter
base causal language model. It is not instruction tuned.

## Architecture

| Field | Value |
|---|---:|
| Parameters | 900,002 |
| Layers / hidden size | 6 / 96 |
| SwiGLU intermediate size | 380 |
| Query / KV heads | 6 / 2 |
| Head dimension | 16 |
| Context | 4,096 |
| Vocabulary | 384, tied |
| Refresh layers | 4 and 6 |
| Refresh kernel | Causal depthwise, width 9 |

The selective XSA refresh gate reads detached attention output as its signal,
reinjects the original input embedding as its value, and carries convolution
history alongside the K/V cache. Its learned residual scalar starts at zero.

## Training

| Field | Value |
|---|---:|
| Progress | 50% |
| Tokens seen | 100,002,693,120 |
| Target tokens | 200,000,000,000 |
| Hardware | 4 x NVIDIA H200 |
| Matrix optimizer | Stock `torch.optim.Muon` |
| Muon peak LR | 0.07 |
| Embedding/control optimizer | AdamW, LR 0.004 |
| Precision | bfloat16 autocast |

| Token range | FineWeb-HQ | Cosmopedia v2 |
|---|---:|---:|
| 0.00B-100.00B | 80% | 20% |
| 100.00B-200.00B | 60% | 40% |

## Usage

```python
from transformers import AutoModelForCausalLM, AutoTokenizer

model_id = "Banaxi-Tech/pico-test"
tokenizer = AutoTokenizer.from_pretrained(model_id, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_id, trust_remote_code=True)
```