
Game	`space-invaders`
Base model	`LiquidAI/LFM2.5-350M`
Adapter layout	`adapter/` (PEFT `adapter_config.json` + weights)
Training	`reject_sft` on DQN teacher demos
Champion generation	1
Promoted	True (teacher warm-start adopted as RL initialization (not gated))
Dataset pack	thesureshg/slm-rl-first-run-002-data

Paste thesureshg/slm-rl-first-run-002 as the playground adapter URL (and usually the same id as the dataset URL).

Install

pip install "transformers>=4.46" peft accelerate torch

Load with transformers + PEFT

Weights live under the adapter/ subfolder — pass subfolder="adapter".

python

import torch
from transformers import AutoModelForCausalLM, AutoTokenizer
from peft import PeftModel

BASE = "LiquidAI/LFM2.5-350M"
ADAPTER = "thesureshg/slm-rl-first-run-002"  # this repo

device = (
    "cuda" if torch.cuda.is_available()
    else "mps" if torch.backends.mps.is_available()
    else "cpu"
)
dtype = torch.bfloat16 if device != "cpu" else torch.float32

tokenizer = AutoTokenizer.from_pretrained(BASE)
if tokenizer.pad_token is None:
    tokenizer.pad_token = tokenizer.eos_token

model = AutoModelForCausalLM.from_pretrained(BASE, torch_dtype=dtype)
model = PeftModel.from_pretrained(model, ADAPTER, subfolder="adapter")
model.to(device).eval()

messages = [
    {"role": "system", "content": "You play Space Invaders. Reply with ACTION: <id>."},
    {"role": "user", "content": "Legal actions: 1) NOOP 2) UP\nChoose."},
]
prompt = tokenizer.apply_chat_template(
    messages, add_generation_prompt=True, tokenize=False,
)
inputs = tokenizer(prompt, return_tensors="pt").to(device)
with torch.inference_mode():
    out = model.generate(**inputs, max_new_tokens=24, do_sample=False)
print(tokenizer.decode(out[0][inputs["input_ids"].shape[-1]:], skip_special_tokens=True))

Download only the adapter files

python

from huggingface_hub import snapshot_download

path = snapshot_download("thesureshg/slm-rl-first-run-002", allow_patterns="adapter/*")
# then: PeftModel.from_pretrained(base_model, f"{path}/adapter")

Workshop / SLM-RL CLI

bash

slm-rl evolve --game space-invaders \
  --dataset-url thesureshg/slm-rl-first-run-002-data \
  --adapter-url thesureshg/slm-rl-first-run-002 \
  --generations 2

Train metrics (if recorded)

json

{
  "eval": {
    "episodes": 2,
    "intervention_rate": 2.0,
    "invalid_rate": 1.0,
    "mean_entropy": null,
    "mean_score": -1.3,
    "primary": -1.3,
    "win_rate": 0.0
  },
  "gate": {
    "promoted": true,
    "reason": "teacher warm-start adopted as RL initialization (not gated)"
  },
  "train": {
    "entropy": 0.014028659394870583,
    "loss": 0.0039739832282066345,
    "mean_token_accuracy": 0.9965277772683364,
    "num_pairs": 330
  }
}

Trained with SLM-RL.