Devstral-Small-2507-quantized.w8a8

Model Overview

• Model Architecture: MistralForCausalLM
  • Input: Text
  • Output: Text
• Model Optimizations:
  • Activation quantization: INT8
  • Weight quantization: INT8
• Release Date: 08/29/2025
• Version: 1.0
• Model Developers: Red Hat (Neural Magic)

Model Optimizations

This model was obtained by quantizing weights and activations of Devstral-Small-2507 to INT8 data type. This optimization reduces the number of bits used to represent weights and activations from 16 to 8, reducing GPU memory requirements (by approximately 50%). Weight quantization also reduces disk size requirements by approximately 50%.

Creation

This model was created with [llm-compressor](https://github.com/vllm-project/llm-compressor) by running the code snippet below.

python quantize.py --model_path mistralai/Devstral-Small-2507 --calib_size 512 --dampening_frac 0.05

import argparse
import os
from datasets import load_dataset
from transformers import AutoModelForCausalLM
from llmcompressor.modifiers.quantization import GPTQModifier
from llmcompressor.modifiers.smoothquant import SmoothQuantModifier
from llmcompressor.transformers import oneshot
from mistral_common.tokens.tokenizers.mistral import MistralTokenizer
from mistral_common.protocol.instruct.request import ChatCompletionRequest
from mistral_common.protocol.instruct.messages import (
  SystemMessage, UserMessage
)

def load_system_prompt(repo_id: str, filename: str) -> str:
  file_path = os.path.join(repo_id, filename)
  with open(file_path, "r") as file:
      system_prompt = file.read()
  return system_prompt

parser = argparse.ArgumentParser()
parser.add_argument('--model_path', type=str)
parser.add_argument('--calib_size', type=int, default=256)
parser.add_argument('--dampening_frac', type=float, default=0.1)
args = parser.parse_args()

model = AutoModelForCausalLM.from_pretrained(
  args.model_path,
  device_map="auto",
  torch_dtype="auto",
  use_cache=False,
  trust_remote_code=True,
)

ds = load_dataset("garage-bAInd/Open-Platypus", split="train")
ds = ds.shuffle(seed=42).select(range(args.calib_size))

SYSTEM_PROMPT = load_system_prompt(args.model_path, "SYSTEM_PROMPT.txt")
tokenizer = MistralTokenizer.from_hf_hub("mistralai/Devstral-Small-2507")

def tokenize(sample):
  tmp = tokenizer.encode_chat_completion(
      ChatCompletionRequest(
          messages=[
              SystemMessage(content=SYSTEM_PROMPT),
              UserMessage(content=sample['instruction']),
          ],
      )
  )
  return {'input_ids': tmp.tokens}

ds = ds.map(tokenize, remove_columns=ds.column_names)

recipe = [
  SmoothQuantModifier(
    smoothing_strength=0.8,
    mappings=[
        [["re:.*q_proj", "re:.*k_proj", "re:.*v_proj"], "re:.*input_layernorm"],
        [["re:.*gate_proj", "re:.*up_proj"], "re:.*post_attention_layernorm"],
        [["re:.*down_proj"], "re:.*up_proj"],
    ],
  ),
  GPTQModifier(
      targets=["Linear"],
      ignore=["lm_head"],
      scheme="W8A8",
      dampening_frac=args.dampening_frac,
  )
]
oneshot(
  model=model,
  dataset=ds,
  recipe=recipe,
  num_calibration_samples=args.calib_size,
  max_seq_length=8192,
)

save_path = args.model_path + "-quantized.w8a8"
model.save_pretrained(save_path)

Deployment

This model can be deployed efficiently using the vLLM backend, as shown in the example below.

vllm serve RedHatAI/Devstral-Small-2507-quantized.w8a8 --tensor-parallel-size 1 --tokenizer_mode mistral

Evaluation

The model was evaluated on popular coding tasks (HumanEval, HumanEval+, MBPP, MBPP+) via EvalPlus and vllm backend (v0.10.1.1). For evaluations, we run greedy sampling and report pass@1. The command to reproduce evals:

evalplus.evaluate --model "RedHatAI/Devstral-Small-2507-quantized.w8a8" \
                  --dataset [humaneval|mbpp] \
                  --base-url http://localhost:8000/v1 \
                  --backend openai --greedy

Accuracy

	Recovery (%)	mistralai/Devstral-Small-2507	RedHatAI/Devstral-Small-2507-quantized.w8a8 (this model)
HumanEval	100.67	89.0	89.6
HumanEval+	101.48	81.1	82.3
MBPP	98.71	77.5	76.5
MBPP+	102.42	66.1	67.7
Average Score	100.77	78.43	79.03