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Model: soumil1/mamba2-10m-slimpajama-500m
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---
license: apache-2.0
library_name: transformers
tags:
- mamba2
- mamba
- vllm
- state-space-model
- causal-language-modeling
- slimpajama
- hpml
datasets:
- cerebras/SlimPajama-627B
pipeline_tag: text-generation
---
# Mamba2 10M SlimPajama 500M
This is the vLLM/Transformers-compatible export of the Mamba2 baseline from our HPML Simamba discretization experiments. It is the same checkpoint as `soumil1/mamba2-10m-slimpajama-500m`, converted from the training repository's `mamba_ssm` checkpoint layout to the standard Hugging Face `Mamba2ForCausalLM` layout that vLLM can identify natively.
The model is a research checkpoint, not an instruction-tuned assistant.
## Checkpoint
| Field | Value |
| --- | --- |
| Variant | Mamba2 baseline |
| Parameters | 9,472,400 unique parameters with tied input/output embeddings |
| Training data | SlimPajama subset, `data/slimpajama_500m_50m/train.bin` |
| Validation data | Held-out SlimPajama subset, `data/slimpajama_500m_50m/val.bin` |
| Tokenizer | `EleutherAI/gpt-neox-20b` tokenizer files are included |
| Context length | 128 tokens during training |
| Best checkpoint step | 122,000 |
| Best validation loss | 4.86253547668457 |
| W&B run | https://wandb.ai/ssb2234-columbia/simamba/runs/dm74y180 |
## vLLM
The repository uses:
```json
{
"model_type": "mamba2",
"architectures": ["Mamba2ForCausalLM"]
}
```
Serve with vLLM:
```bash
vllm serve soumil1/mamba2-10m-slimpajama-500m \
--dtype float32 \
--max-model-len 128
```
For offline inference:
```python
from vllm import LLM, SamplingParams
llm = LLM(
model="soumil1/mamba2-10m-slimpajama-500m",
dtype="float32",
max_model_len=128,
)
outputs = llm.generate(
["State space models are"],
SamplingParams(max_tokens=32, temperature=0.8),
)
print(outputs[0].outputs[0].text)
```
## Transformers
```python
import torch
from transformers import AutoTokenizer, Mamba2ForCausalLM
repo_id = "soumil1/mamba2-10m-slimpajama-500m"
tokenizer = AutoTokenizer.from_pretrained(repo_id)
model = Mamba2ForCausalLM.from_pretrained(repo_id, torch_dtype=torch.float32).cuda()
model.eval()
input_ids = tokenizer("State space models are", return_tensors="pt").input_ids.cuda()
with torch.no_grad():
logits = model(input_ids).logits
print(logits.shape)
```
## Architecture
```json
{
"hidden_size": 160,
"num_hidden_layers": 8,
"vocab_size": 50280,
"state_size": 64,
"conv_kernel": 4,
"expand": 2,
"head_dim": 32,
"num_heads": 10,
"n_groups": 1,
"chunk_size": 16,
"tie_word_embeddings": true
}
```
## Limitations
This is a small pretraining checkpoint trained for controlled architecture comparison. It was trained on a limited SlimPajama subset with a short sequence length, so generation quality and downstream task performance should be interpreted cautiously.