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---
license: gemma
library_name: transformers
pipeline_tag: image-text-to-text
extra_gated_heading: Access Gemma on Hugging Face
extra_gated_prompt: To access Gemma on Hugging Face, you’re required to review and
agree to Google’s usage license. To do this, please ensure you’re logged in to Hugging
Face and click below. Requests are processed immediately.
extra_gated_button_content: Acknowledge license
base_model: google/gemma-3-27b-it
---
# Gemma 3 27B Instruction-tuned INT4
This is the QAT INT4 Flax checkpoint (from Kaggle) converted to HF+AWQ format for ease of use. AWQ was NOT used for quantization. You can find the conversion script `convert_flax.py` in this model repo.
Below is the original Model card from https://huggingface.co/google/gemma-3-27b-it
# Gemma 3 model card
**Model Page**: [Gemma](https://ai.google.dev/gemma/docs/core)
**Resources and Technical Documentation**:
* [Gemma 3 Technical Report][g3-tech-report]
* [Responsible Generative AI Toolkit][rai-toolkit]
* [Gemma on Kaggle][kaggle-gemma]
* [Gemma on Vertex Model Garden][vertex-mg-gemma3]
**Terms of Use**: [Terms][terms]
**Authors**: Google DeepMind
## Model Information
Summary description and brief definition of inputs and outputs.
### Description
Gemma is a family of lightweight, state-of-the-art open models from Google,
built from the same research and technology used to create the Gemini models.
Gemma 3 models are multimodal, handling text and image input and generating text
output, with open weights for both pre-trained variants and instruction-tuned
variants. Gemma 3 has a large, 128K context window, multilingual support in over
140 languages, and is available in more sizes than previous versions. Gemma 3
models are well-suited for a variety of text generation and image understanding
tasks, including question answering, summarization, and reasoning. Their
relatively small size makes it possible to deploy them in environments with
limited resources such as laptops, desktops or your own cloud infrastructure,
democratizing access to state of the art AI models and helping foster innovation
for everyone.
### Inputs and outputs
- **Input:**
- Text string, such as a question, a prompt, or a document to be summarized
- Images, normalized to 896 x 896 resolution and encoded to 256 tokens
each
- Total input context of 128K tokens for the 4B, 12B, and 27B sizes, and
32K tokens for the 1B size
- **Output:**
- Generated text in response to the input, such as an answer to a
question, analysis of image content, or a summary of a document
- Total output context of 8192 tokens
### Usage
Below there are some code snippets on how to get quickly started with running the model. First, install the Transformers library with the version made for Gemma 3:
```sh
$ pip install git+https://github.com/huggingface/transformers@v4.49.0-Gemma-3
```
Then, copy the snippet from the section that is relevant for your use case.
#### Running with the `pipeline` API
You can initialize the model and processor for inference with `pipeline` as follows.
```python
from transformers import pipeline
import torch
pipe = pipeline(
"image-text-to-text",
model="google/gemma-3-27b-it",
device="cuda",
torch_dtype=torch.bfloat16
)
```
With instruction-tuned models, you need to use chat templates to process our inputs first. Then, you can pass it to the pipeline.
```python
messages = [
{
"role": "system",
"content": [{"type": "text", "text": "You are a helpful assistant."}]
},
{
"role": "user",
"content": [
{"type": "image", "url": "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/p-blog/candy.JPG"},
{"type": "text", "text": "What animal is on the candy?"}
]
}
]
output = pipe(text=messages, max_new_tokens=200)
print(output[0][0]["generated_text"][-1]["content"])
# Okay, let's take a look!
# Based on the image, the animal on the candy is a **turtle**.
# You can see the shell shape and the head and legs.
```
#### Running the model on a single/multi GPU
```python
# pip install accelerate
from transformers import AutoProcessor, Gemma3ForConditionalGeneration
from PIL import Image
import requests
import torch
model_id = "google/gemma-3-27b-it"
model = Gemma3ForConditionalGeneration.from_pretrained(
model_id, device_map="auto"
).eval()
processor = AutoProcessor.from_pretrained(model_id)
messages = [
{
"role": "system",
"content": [{"type": "text", "text": "You are a helpful assistant."}]
},
{
"role": "user",
"content": [
{"type": "image", "image": "https://huggingface.co/datasets/huggingface/documentation-images/resolve/main/bee.jpg"},
{"type": "text", "text": "Describe this image in detail."}
]
}
]
inputs = processor.apply_chat_template(
messages, add_generation_prompt=True, tokenize=True,
return_dict=True, return_tensors="pt"
).to(model.device, dtype=torch.bfloat16)
input_len = inputs["input_ids"].shape[-1]
with torch.inference_mode():
generation = model.generate(**inputs, max_new_tokens=100, do_sample=False)
generation = generation[0][input_len:]
decoded = processor.decode(generation, skip_special_tokens=True)
print(decoded)
# **Overall Impression:** The image is a close-up shot of a vibrant garden scene,
# focusing on a cluster of pink cosmos flowers and a busy bumblebee.
# It has a slightly soft, natural feel, likely captured in daylight.
```
### Citation
```none
@article{gemma_2025,
title={Gemma 3},
url={https://goo.gle/Gemma3Report},
publisher={Kaggle},
author={Gemma Team},
year={2025}
}
```
## Model Data
Data used for model training and how the data was processed.
### Training Dataset
These models were trained on a dataset of text data that includes a wide variety
of sources. The 27B model was trained with 14 trillion tokens, the 12B model was
trained with 12 trillion tokens, 4B model was trained with 4 trillion tokens and
1B with 2 trillion tokens. Here are the key components:
- Web Documents: A diverse collection of web text ensures the model is
exposed to a broad range of linguistic styles, topics, and vocabulary. The
training dataset includes content in over 140 languages.
- Code: Exposing the model to code helps it to learn the syntax and
patterns of programming languages, which improves its ability to generate
code and understand code-related questions.
- Mathematics: Training on mathematical text helps the model learn logical
reasoning, symbolic representation, and to address mathematical queries.
- Images: A wide range of images enables the model to perform image
analysis and visual data extraction tasks.
The combination of these diverse data sources is crucial for training a powerful
multimodal model that can handle a wide variety of different tasks and data
formats.
### Data Preprocessing
Here are the key data cleaning and filtering methods applied to the training
data:
- CSAM Filtering: Rigorous CSAM (Child Sexual Abuse Material) filtering
was applied at multiple stages in the data preparation process to ensure
the exclusion of harmful and illegal content.
- Sensitive Data Filtering: As part of making Gemma pre-trained models
safe and reliable, automated techniques were used to filter out certain
personal information and other sensitive data from training sets.
- Additional methods: Filtering based on content quality and safety in
line with [our policies][safety-policies].
## Implementation Information
Details about the model internals.
### Hardware
Gemma was trained using [Tensor Processing Unit (TPU)][tpu] hardware (TPUv4p,
TPUv5p and TPUv5e). Training vision-language models (VLMS) requires significant
computational power. TPUs, designed specifically for matrix operations common in
machine learning, offer several advantages in this domain:
- Performance: TPUs are specifically designed to handle the massive
computations involved in training VLMs. They can speed up training
considerably compared to CPUs.
- Memory: TPUs often come with large amounts of high-bandwidth memory,
allowing for the handling of large models and batch sizes during training.
This can lead to better model quality.
- Scalability: TPU Pods (large clusters of TPUs) provide a scalable
solution for handling the growing complexity of large foundation models.
You can distribute training across multiple TPU devices for faster and more
efficient processing.
- Cost-effectiveness: In many scenarios, TPUs can provide a more
cost-effective solution for training large models compared to CPU-based
infrastructure, especially when considering the time and resources saved
due to faster training.
- These advantages are aligned with
[Google's commitments to operate sustainably][sustainability].
### Software
Training was done using [JAX][jax] and [ML Pathways][ml-pathways].
JAX allows researchers to take advantage of the latest generation of hardware,
including TPUs, for faster and more efficient training of large models. ML
Pathways is Google's latest effort to build artificially intelligent systems
capable of generalizing across multiple tasks. This is specially suitable for
foundation models, including large language models like these ones.
Together, JAX and ML Pathways are used as described in the
[paper about the Gemini family of models][gemini-2-paper]; *"the 'single
controller' programming model of Jax and Pathways allows a single Python
process to orchestrate the entire training run, dramatically simplifying the
development workflow."*
## Evaluation
Model evaluation metrics and results.
### Benchmark Results
These models were evaluated against a large collection of different datasets and
metrics to cover different aspects of text generation:
#### Reasoning and factuality
| Benchmark | Metric | Gemma 3 PT 1B | Gemma 3 PT 4B | Gemma 3 PT 12B | Gemma 3 PT 27B |
| ------------------------------ |----------------|:--------------:|:-------------:|:--------------:|:--------------:|
| [HellaSwag][hellaswag] | 10-shot | 62.3 | 77.2 | 84.2 | 85.6 |
| [BoolQ][boolq] | 0-shot | 63.2 | 72.3 | 78.8 | 82.4 |
| [PIQA][piqa] | 0-shot | 73.8 | 79.6 | 81.8 | 83.3 |
| [SocialIQA][socialiqa] | 0-shot | 48.9 | 51.9 | 53.4 | 54.9 |
| [TriviaQA][triviaqa] | 5-shot | 39.8 | 65.8 | 78.2 | 85.5 |
| [Natural Questions][naturalq] | 5-shot | 9.48 | 20.0 | 31.4 | 36.1 |
| [ARC-c][arc] | 25-shot | 38.4 | 56.2 | 68.9 | 70.6 |
| [ARC-e][arc] | 0-shot | 73.0 | 82.4 | 88.3 | 89.0 |
| [WinoGrande][winogrande] | 5-shot | 58.2 | 64.7 | 74.3 | 78.8 |
| [BIG-Bench Hard][bbh] | few-shot | 28.4 | 50.9 | 72.6 | 77.7 |
| [DROP][drop] | 1-shot | 42.4 | 60.1 | 72.2 | 77.2 |
[hellaswag]: https://arxiv.org/abs/1905.07830
[boolq]: https://arxiv.org/abs/1905.10044
[piqa]: https://arxiv.org/abs/1911.11641
[socialiqa]: https://arxiv.org/abs/1904.09728
[triviaqa]: https://arxiv.org/abs/1705.03551
[naturalq]: https://github.com/google-research-datasets/natural-questions
[arc]: https://arxiv.org/abs/1911.01547
[winogrande]: https://arxiv.org/abs/1907.10641
[bbh]: https://paperswithcode.com/dataset/bbh
[drop]: https://arxiv.org/abs/1903.00161
#### STEM and code
| Benchmark | Metric | Gemma 3 PT 4B | Gemma 3 PT 12B | Gemma 3 PT 27B |
| ------------------------------ |----------------|:-------------:|:--------------:|:--------------:|
| [MMLU][mmlu] | 5-shot | 59.6 | 74.5 | 78.6 |
| [MMLU][mmlu] (Pro COT) | 5-shot | 29.2 | 45.3 | 52.2 |
| [AGIEval][agieval] | 3-5-shot | 42.1 | 57.4 | 66.2 |
| [MATH][math] | 4-shot | 24.2 | 43.3 | 50.0 |
| [GSM8K][gsm8k] | 8-shot | 38.4 | 71.0 | 82.6 |
| [GPQA][gpqa] | 5-shot | 15.0 | 25.4 | 24.3 |
| [MBPP][mbpp] | 3-shot | 46.0 | 60.4 | 65.6 |
| [HumanEval][humaneval] | 0-shot | 36.0 | 45.7 | 48.8 |
[mmlu]: https://arxiv.org/abs/2009.03300
[agieval]: https://arxiv.org/abs/2304.06364
[math]: https://arxiv.org/abs/2103.03874
[gsm8k]: https://arxiv.org/abs/2110.14168
[gpqa]: https://arxiv.org/abs/2311.12022
[mbpp]: https://arxiv.org/abs/2108.07732
[humaneval]: https://arxiv.org/abs/2107.03374
#### Multilingual
| Benchmark | Gemma 3 PT 1B | Gemma 3 PT 4B | Gemma 3 PT 12B | Gemma 3 PT 27B |
| ------------------------------------ |:-------------:|:-------------:|:--------------:|:--------------:|
| [MGSM][mgsm] | 2.04 | 34.7 | 64.3 | 74.3 |
| [Global-MMLU-Lite][global-mmlu-lite] | 24.9 | 57.0 | 69.4 | 75.7 |
| [WMT24++][wmt24pp] (ChrF) | 36.7 | 48.4 | 53.9 | 55.7 |
| [FloRes][flores] | 29.5 | 39.2 | 46.0 | 48.8 |
| [XQuAD][xquad] (all) | 43.9 | 68.0 | 74.5 | 76.8 |
| [ECLeKTic][eclektic] | 4.69 | 11.0 | 17.2 | 24.4 |
| [IndicGenBench][indicgenbench] | 41.4 | 57.2 | 61.7 | 63.4 |
[mgsm]: https://arxiv.org/abs/2210.03057
[flores]: https://arxiv.org/abs/2106.03193
[xquad]: https://arxiv.org/abs/1910.11856v3
[global-mmlu-lite]: https://huggingface.co/datasets/CohereForAI/Global-MMLU-Lite
[wmt24pp]: https://arxiv.org/abs/2502.12404v1
[eclektic]: https://arxiv.org/abs/2502.21228
[indicgenbench]: https://arxiv.org/abs/2404.16816
#### Multimodal
| Benchmark | Gemma 3 PT 4B | Gemma 3 PT 12B | Gemma 3 PT 27B |
| ------------------------------ |:-------------:|:--------------:|:--------------:|
| [COCOcap][coco-cap] | 102 | 111 | 116 |
| [DocVQA][docvqa] (val) | 72.8 | 82.3 | 85.6 |
| [InfoVQA][info-vqa] (val) | 44.1 | 54.8 | 59.4 |
| [MMMU][mmmu] (pt) | 39.2 | 50.3 | 56.1 |
| [TextVQA][textvqa] (val) | 58.9 | 66.5 | 68.6 |
| [RealWorldQA][realworldqa] | 45.5 | 52.2 | 53.9 |
| [ReMI][remi] | 27.3 | 38.5 | 44.8 |
| [AI2D][ai2d] | 63.2 | 75.2 | 79.0 |
| [ChartQA][chartqa] | 63.6 | 74.7 | 76.3 |
| [VQAv2][vqav2] | 63.9 | 71.2 | 72.9 |
| [BLINK][blinkvqa] | 38.0 | 35.9 | 39.6 |
| [OKVQA][okvqa] | 51.0 | 58.7 | 60.2 |
| [TallyQA][tallyqa] | 42.5 | 51.8 | 54.3 |
| [SpatialSense VQA][ss-vqa] | 50.9 | 60.0 | 59.4 |
| [CountBenchQA][countbenchqa] | 26.1 | 17.8 | 68.0 |
[coco-cap]: https://cocodataset.org/#home
[docvqa]: https://www.docvqa.org/
[info-vqa]: https://arxiv.org/abs/2104.12756
[mmmu]: https://arxiv.org/abs/2311.16502
[textvqa]: https://textvqa.org/
[realworldqa]: https://paperswithcode.com/dataset/realworldqa
[remi]: https://arxiv.org/html/2406.09175v1
[ai2d]: https://allenai.org/data/diagrams
[chartqa]: https://arxiv.org/abs/2203.10244
[vqav2]: https://visualqa.org/index.html
[blinkvqa]: https://arxiv.org/abs/2404.12390
[okvqa]: https://okvqa.allenai.org/
[tallyqa]: https://arxiv.org/abs/1810.12440
[ss-vqa]: https://arxiv.org/abs/1908.02660
[countbenchqa]: https://github.com/google-research/big_vision/blob/main/big_vision/datasets/countbenchqa/
## Ethics and Safety
Ethics and safety evaluation approach and results.
### Evaluation Approach
Our evaluation methods include structured evaluations and internal red-teaming
testing of relevant content policies. Red-teaming was conducted by a number of
different teams, each with different goals and human evaluation metrics. These
models were evaluated against a number of different categories relevant to
ethics and safety, including:
- **Child Safety**: Evaluation of text-to-text and image to text prompts
covering child safety policies, including child sexual abuse and
exploitation.
- **Content Safety:** Evaluation of text-to-text and image to text prompts
covering safety policies including, harassment, violence and gore, and hate
speech.
- **Representational Harms**: Evaluation of text-to-text and image to text
prompts covering safety policies including bias, stereotyping, and harmful
associations or inaccuracies.
In addition to development level evaluations, we conduct "assurance
evaluations" which are our 'arms-length' internal evaluations for responsibility
governance decision making. They are conducted separately from the model
development team, to inform decision making about release. High level findings
are fed back to the model team, but prompt sets are held-out to prevent
overfitting and preserve the results' ability to inform decision making.
Assurance evaluation results are reported to our Responsibility & Safety Council
as part of release review.
### Evaluation Results
For all areas of safety testing, we saw major improvements in the categories of
child safety, content safety, and representational harms relative to previous
Gemma models. All testing was conducted without safety filters to evaluate the
model capabilities and behaviors. For both text-to-text and image-to-text, and
across all model sizes, the model produced minimal policy violations, and showed
significant improvements over previous Gemma models' performance with respect
to ungrounded inferences. A limitation of our evaluations was they included only
English language prompts.
## Usage and Limitations
These models have certain limitations that users should be aware of.
### Intended Usage
Open vision-language models (VLMs) models have a wide range of applications
across various industries and domains. The following list of potential uses is
not comprehensive. The purpose of this list is to provide contextual information
about the possible use-cases that the model creators considered as part of model
training and development.
- Content Creation and Communication
- Text Generation: These models can be used to generate creative text
formats such as poems, scripts, code, marketing copy, and email drafts.
- Chatbots and Conversational AI: Power conversational interfaces
for customer service, virtual assistants, or interactive applications.
- Text Summarization: Generate concise summaries of a text corpus,
research papers, or reports.
- Image Data Extraction: These models can be used to extract,
interpret, and summarize visual data for text communications.
- Research and Education
- Natural Language Processing (NLP) and VLM Research: These
models can serve as a foundation for researchers to experiment with VLM
and NLP techniques, develop algorithms, and contribute to the
advancement of the field.
- Language Learning Tools: Support interactive language learning
experiences, aiding in grammar correction or providing writing practice.
- Knowledge Exploration: Assist researchers in exploring large
bodies of text by generating summaries or answering questions about
specific topics.
### Limitations
- Training Data
- The quality and diversity of the training data significantly
influence the model's capabilities. Biases or gaps in the training data
can lead to limitations in the model's responses.
- The scope of the training dataset determines the subject areas
the model can handle effectively.
- Context and Task Complexity
- Models are better at tasks that can be framed with clear
prompts and instructions. Open-ended or highly complex tasks might be
challenging.
- A model's performance can be influenced by the amount of context
provided (longer context generally leads to better outputs, up to a
certain point).
- Language Ambiguity and Nuance
- Natural language is inherently complex. Models might struggle
to grasp subtle nuances, sarcasm, or figurative language.
- Factual Accuracy
- Models generate responses based on information they learned
from their training datasets, but they are not knowledge bases. They
may generate incorrect or outdated factual statements.
- Common Sense
- Models rely on statistical patterns in language. They might
lack the ability to apply common sense reasoning in certain situations.
### Ethical Considerations and Risks
The development of vision-language models (VLMs) raises several ethical
concerns. In creating an open model, we have carefully considered the following:
- Bias and Fairness
- VLMs trained on large-scale, real-world text and image data can
reflect socio-cultural biases embedded in the training material. These
models underwent careful scrutiny, input data pre-processing described
and posterior evaluations reported in this card.
- Misinformation and Misuse
- VLMs can be misused to generate text that is false, misleading,
or harmful.
- Guidelines are provided for responsible use with the model, see the
[Responsible Generative AI Toolkit][rai-toolkit].
- Transparency and Accountability:
- This model card summarizes details on the models' architecture,
capabilities, limitations, and evaluation processes.
- A responsibly developed open model offers the opportunity to
share innovation by making VLM technology accessible to developers and
researchers across the AI ecosystem.
Risks identified and mitigations:
- **Perpetuation of biases**: It's encouraged to perform continuous
monitoring (using evaluation metrics, human review) and the exploration of
de-biasing techniques during model training, fine-tuning, and other use
cases.
- **Generation of harmful content**: Mechanisms and guidelines for content
safety are essential. Developers are encouraged to exercise caution and
implement appropriate content safety safeguards based on their specific
product policies and application use cases.
- **Misuse for malicious purposes**: Technical limitations and developer
and end-user education can help mitigate against malicious applications of
VLMs. Educational resources and reporting mechanisms for users to flag
misuse are provided. Prohibited uses of Gemma models are outlined in the
[Gemma Prohibited Use Policy][prohibited-use].
- **Privacy violations**: Models were trained on data filtered for removal
of certain personal information and other sensitive data. Developers are
encouraged to adhere to privacy regulations with privacy-preserving
techniques.
### Benefits
At the time of release, this family of models provides high-performance open
vision-language model implementations designed from the ground up for
responsible AI development compared to similarly sized models.
Using the benchmark evaluation metrics described in this document, these models
have shown to provide superior performance to other, comparably-sized open model
alternatives.
[g3-tech-report]: https://goo.gle/Gemma3Report
[rai-toolkit]: https://ai.google.dev/responsible
[kaggle-gemma]: https://www.kaggle.com/models/google/gemma-3
[vertex-mg-gemma3]: https://console.cloud.google.com/vertex-ai/publishers/google/model-garden/gemma3
[terms]: https://ai.google.dev/gemma/terms
[safety-policies]: https://ai.google/static/documents/ai-responsibility-update-published-february-2025.pdf
[prohibited-use]: https://ai.google.dev/gemma/prohibited_use_policy
[tpu]: https://cloud.google.com/tpu/docs/intro-to-tpu
[sustainability]: https://sustainability.google/operating-sustainably/
[jax]: https://github.com/jax-ml/jax
[ml-pathways]: https://blog.google/technology/ai/introducing-pathways-next-generation-ai-architecture/
[sustainability]: https://sustainability.google/operating-sustainably/
[gemini-2-paper]: https://arxiv.org/abs/2312.11805

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{
"<image_soft_token>": 262144
}

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{
"chat_template": "{{ bos_token }}\n{%- if messages[0]['role'] == 'system' -%}\n {%- if messages[0]['content'] is string -%}\n {%- set first_user_prefix = messages[0]['content'] + '\n\n' -%}\n {%- else -%}\n {%- set first_user_prefix = messages[0]['content'][0]['text'] + '\n\n' -%}\n {%- endif -%}\n {%- set loop_messages = messages[1:] -%}\n{%- else -%}\n {%- set first_user_prefix = \"\" -%}\n {%- set loop_messages = messages -%}\n{%- endif -%}\n{%- for message in loop_messages -%}\n {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) -%}\n {{ raise_exception(\"Conversation roles must alternate user/assistant/user/assistant/...\") }}\n {%- endif -%}\n {%- if (message['role'] == 'assistant') -%}\n {%- set role = \"model\" -%}\n {%- else -%}\n {%- set role = message['role'] -%}\n {%- endif -%}\n {{ '<start_of_turn>' + role + '\n' + (first_user_prefix if loop.first else \"\") }}\n {%- if message['content'] is string -%}\n {{ message['content'] | trim }}\n {%- elif message['content'] is iterable -%}\n {%- for item in message['content'] -%}\n {%- if item['type'] == 'image' -%}\n {{ '<start_of_image>' }}\n {%- elif item['type'] == 'text' -%}\n {{ item['text'] | trim }}\n {%- endif -%}\n {%- endfor -%}\n {%- else -%}\n {{ raise_exception(\"Invalid content type\") }}\n {%- endif -%}\n {{ '<end_of_turn>\n' }}\n{%- endfor -%}\n{%- if add_generation_prompt -%}\n {{'<start_of_turn>model\n'}}\n{%- endif -%}\n"
}

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{
"architectures": [
"Gemma3ForConditionalGeneration"
],
"boi_token_index": 255999,
"eoi_token_index": 256000,
"eos_token_id": [
1,
106
],
"image_token_index": 262144,
"initializer_range": 0.02,
"mm_tokens_per_image": 256,
"model_type": "gemma3",
"text_config": {
"head_dim": 128,
"hidden_size": 5376,
"intermediate_size": 21504,
"model_type": "gemma3_text",
"num_attention_heads": 32,
"num_hidden_layers": 62,
"num_key_value_heads": 16,
"query_pre_attn_scalar": 168,
"rope_scaling": {
"factor": 8.0,
"rope_type": "linear"
},
"sliding_window": 1024
},
"torch_dtype": "bfloat16",
"transformers_version": "4.50.0.dev0",
"vision_config": {
"hidden_size": 1152,
"image_size": 896,
"intermediate_size": 4304,
"model_type": "siglip_vision_model",
"num_attention_heads": 16,
"num_hidden_layers": 27,
"patch_size": 14,
"vision_use_head": false
},
"quantization_config": {
"bits": 4,
"group_size": 32,
"quant_method": "awq",
"version": "gemm",
"zero_point": true,
"modules_to_not_convert": [
"lm_head",
"vision_tower"
]
}
}

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import argparse
import json
from pathlib import Path
import jax
import jax.numpy as jnp
import numpy as np
import orbax.checkpoint as ocp
from safetensors.flax import save_file
from tqdm import tqdm
SIGLIP_PREFIX = "SigLiPFromPatches_0/siglip_encoder"
def flatten(x: np.ndarray, start: int = 0, end: int = -1):
if start < 0:
start += x.ndim
if end < 0:
end += x.ndim
new_shape = x.shape[:start] + (-1,) + x.shape[end + 1 :]
return x.reshape(new_shape)
def unflatten(x: np.ndarray, dim: int, sizes: tuple[int, ...]):
new_shape = x.shape[:dim] + tuple(sizes) + x.shape[dim + 1 :]
return x.reshape(new_shape)
# correct quantization parameters mean quantization error = 0 (or close to 0)
def check_groups(groups: np.ndarray, scales: np.ndarray, dim: int):
# groups: (a, b, c, 32, d, e, f)
# scales: (a, b, c, 1, d, e, f)
inv_scale = 1.0 / scales.clip(1e-12)
q_group = np.round(groups * inv_scale)
max_diff = np.abs(q_group * scales - groups).max(dim, keepdims=True)
return max_diff < 1e-6, max_diff
def find_scales(w: np.ndarray, dim: int):
w = unflatten(w, dim, (-1, 32))
group_range = w.max(dim + 1, keepdims=True) - w.min(dim + 1, keepdims=True)
scales = np.zeros_like(group_range)
for q in range(15, 0, -1):
try_scale = group_range / q
ok, _ = check_groups(w, try_scale, dim + 1)
scales[ok] = try_scale[ok]
ok, _ = check_groups(w, scales, dim + 1)
assert ok.all()
return scales.squeeze(dim + 1)
def convert_siglip(params, num_layers: int):
state_dict = dict()
def convert_layer(prefix: str, layer: dict[str, np.ndarray]):
bias = layer["bias"]
if "kernel" in layer:
w = layer["kernel"]
if w.ndim == 2: # linear layer
w = w.T
elif w.ndim == 3: # attn projection
# qkv projection - (dim, num_heads, head_dim)
if bias.ndim == 2:
w = flatten(w, 1, 2).T
bias = bias.reshape(-1)
# o projection - (num_heads, head_dim, dim)
elif bias.ndim == 1:
w = flatten(w, 0, 1).T
elif w.ndim == 4: # conv2d layer
w = w.transpose(3, 2, 0, 1)
else:
raise RuntimeError(f"Unsupported {w.shape=}")
elif "scale" in layer: # layer norm
w = layer["scale"]
else:
raise RuntimeError
state_dict[f"{prefix}weight"] = w
state_dict[f"{prefix}bias"] = bias
convert_layer("embeddings.patch_embedding.", params[f"{SIGLIP_PREFIX}/embedding"])
state_dict["embeddings.position_embedding.weight"] = params[SIGLIP_PREFIX]["pos_embedding"].squeeze(0)
convert_layer("post_layernorm.", params[f"{SIGLIP_PREFIX}/Transformer/encoder_norm"])
for layer_idx in range(num_layers):
prefix = f"encoder.layers.{layer_idx}."
layer_prefix = f"{SIGLIP_PREFIX}/Transformer/encoderblock_{layer_idx}/"
convert_layer(f"{prefix}layer_norm1.", params[f"{layer_prefix}LayerNorm_0"])
convert_layer(f"{prefix}layer_norm2.", params[f"{layer_prefix}LayerNorm_1"])
attn_prefix = f"{layer_prefix}MultiHeadDotProductAttention_0/"
convert_layer(f"{prefix}self_attn.q_proj.", params[f"{attn_prefix}query"])
convert_layer(f"{prefix}self_attn.k_proj.", params[f"{attn_prefix}key"])
convert_layer(f"{prefix}self_attn.v_proj.", params[f"{attn_prefix}value"])
convert_layer(f"{prefix}self_attn.out_proj.", params[f"{attn_prefix}out"])
mlp_prefix = f"{layer_prefix}MlpBlock_0/"
convert_layer(f"{prefix}mlp.fc1.", params[f"{mlp_prefix}Dense_0"])
convert_layer(f"{prefix}mlp.fc2.", params[f"{mlp_prefix}Dense_1"])
return state_dict
# convert to HF format first, then apply quantization
def convert_to_hf(path: Path):
path = path.absolute() # orbax only works with absolute path
ckpt = ocp.StandardCheckpointer()
metadata = dict(ckpt.metadata(path))
metadata = jax.tree.map(ocp.utils.to_shape_dtype_struct, metadata)
num_layers = num_siglip_layers = 0
while f"transformer/layer_{num_layers}/attn/_key_norm" in metadata:
num_layers += 1
while f"{SIGLIP_PREFIX}/Transformer/encoderblock_{num_siglip_layers}/LayerNorm_0" in metadata:
num_siglip_layers += 1
print(f"{num_layers=}")
print(f"{num_siglip_layers=}")
# NOTE: all gemma3 models use tied embeddings, even for the 27B version.
params = ckpt.restore(path)
state_dict = dict()
if num_siglip_layers > 0:
# HF append unused tokens for no reason???
embed = params["transformer/embedder"]["input_embedding"]
params["transformer/embedder"]["input_embedding"] = np.pad(embed, ((0, 64), (0, 0)))
gemma_prefix = "language_model."
prefix = "multi_modal_projector.mm_"
jax_prefix = "transformer/embedder/"
state_dict[f"{prefix}input_projection_weight"] = params[f"{jax_prefix}mm_input_projection"]["w"]
state_dict[f"{prefix}soft_emb_norm.weight"] = params[f"{jax_prefix}mm_soft_embedding_norm"]["scale"]
else:
gemma_prefix = ""
state_dict[f"{gemma_prefix}model.embed_tokens.weight"] = params["transformer/embedder"]["input_embedding"]
state_dict[f"{gemma_prefix}model.norm.weight"] = params["transformer/final_norm"]["scale"]
yield state_dict
for layer_idx in range(num_layers):
jax_prefix = f"transformer/layer_{layer_idx}/"
state_dict = dict()
prefix = f"{gemma_prefix}model.layers.{layer_idx}."
state_dict[f"{prefix}input_layernorm.weight"] = params[f"{jax_prefix}pre_attention_norm"]["scale"]
state_dict[f"{prefix}post_attention_layernorm.weight"] = params[f"{jax_prefix}post_attention_norm"]["scale"]
state_dict[f"{prefix}pre_feedforward_layernorm.weight"] = params[f"{jax_prefix}pre_ffw_norm"]["scale"]
state_dict[f"{prefix}post_feedforward_layernorm.weight"] = params[f"{jax_prefix}post_ffw_norm"]["scale"]
prefix = f"{gemma_prefix}model.layers.{layer_idx}.self_attn."
jax_prefix = f"transformer/layer_{layer_idx}/attn/"
state_dict[f"{prefix}q_norm.weight"] = params[f"{jax_prefix}_query_norm"]["scale"]
state_dict[f"{prefix}k_norm.weight"] = params[f"{jax_prefix}_key_norm"]["scale"]
# (num_heads, hidden_size, head_dim) -> (num_heads * head_dim, hidden_size)
state_dict[f"{prefix}q_proj.weight"] = flatten(params[f"{jax_prefix}q_einsum"]["w"].transpose(0, 2, 1), end=1)
state_dict[f"{prefix}k_proj.weight"] = flatten(
params[f"{jax_prefix}kv_einsum"]["w"][0].transpose(0, 2, 1), end=1
)
state_dict[f"{prefix}v_proj.weight"] = flatten(
params[f"{jax_prefix}kv_einsum"]["w"][1].transpose(0, 2, 1), end=1
)
# (num_heads, head_dim, hidden_size) -> (hidden_size, num_heads * head_dim)
state_dict[f"{prefix}o_proj.weight"] = flatten(params[f"{jax_prefix}attn_vec_einsum"]["w"], end=1).T
prefix = f"{gemma_prefix}model.layers.{layer_idx}.mlp."
jax_prefix = f"transformer/layer_{layer_idx}/mlp/"
state_dict[f"{prefix}gate_proj.weight"] = params[f"{jax_prefix}gating_einsum"]["w"][0]
state_dict[f"{prefix}up_proj.weight"] = params[f"{jax_prefix}gating_einsum"]["w"][1]
state_dict[f"{prefix}down_proj.weight"] = params[f"{jax_prefix}linear"]["w"].T
yield state_dict
# vision tower
if num_siglip_layers > 0:
siglip_state_dict = convert_siglip(params, num_siglip_layers)
for k, v in siglip_state_dict.items():
state_dict[f"vision_tower.vision_model.{k}"] = v
yield state_dict
def convert_awq(state_dict: dict[str, np.ndarray]):
awq_state_dict = dict()
for k, v in state_dict.items():
if (
k.endswith("model.embed_tokens.weight") # AWQ doesn't support INT4 embeddings
or k.startswith(("vision_tower", "multi_modal_projector")) # vision tower is not quantized
or v.ndim == 1
):
awq_state_dict[k] = v.astype(jnp.bfloat16)
continue
assert v.ndim == 2
v = v.T # AWQ transpose the weight
K, N = v.shape
scales = find_scales(v, dim=0) # (K/32, N)
inv_scale = 1 / scales.clip(1e-12)
qweight = np.round(v.reshape(K // 32, 32, N) * inv_scale[:, None])
# AWQ is actually UINT4 (instead of INT4)
# hence, we will shift qweight up by 8 (even though Google AQT only uses [-7,7])
# and set zero_point = 8
qweight = (qweight + 8).astype(np.uint32)
# AWQ pack 8 int4 into UINT32 in the following layout (from high bits to low bits)
# [7 5 3 1 6 4 2 0] along the 2nd dim
qweight = qweight.reshape(K, N // 8, 8)
qweight_packed = (
(qweight[..., 7] << (7 * 4))
| (qweight[..., 5] << (6 * 4))
| (qweight[..., 3] << (5 * 4))
| (qweight[..., 1] << (4 * 4))
| (qweight[..., 6] << (3 * 4))
| (qweight[..., 4] << (2 * 4))
| (qweight[..., 2] << (1 * 4))
| (qweight[..., 0] << (0 * 4))
)
qweight_packed = qweight_packed.view(np.int32).reshape(K, N // 8)
prefix = k.removesuffix(".weight")
awq_state_dict[f"{prefix}.qweight"] = qweight_packed
awq_state_dict[f"{prefix}.qzeros"] = np.full((K // 32, N // 8), 0x8888_8888, dtype=np.uint32).view(np.int32)
awq_state_dict[f"{prefix}.scales"] = scales.astype(jnp.bfloat16)
return awq_state_dict
if __name__ == "__main__":
parser = argparse.ArgumentParser()
parser.add_argument("--ckpt_dir", required=True, type=Path)
parser.add_argument("--save_dir", required=True, type=Path)
args = parser.parse_args()
args.save_dir.mkdir(parents=True, exist_ok=True)
total_size = 0
weight_map = dict()
state_dict = dict()
size = 0
shard_idx = 0
filename = f"model-{shard_idx + 1:05d}.safetensors"
for sub_state_dict in tqdm(convert_to_hf(args.ckpt_dir)):
sub_state_dict = convert_awq(sub_state_dict)
new_size = sum(v.nbytes for v in sub_state_dict.values())
if size + new_size > 5e9:
save_file(state_dict, args.save_dir / filename)
state_dict = dict()
size = 0
shard_idx += 1
filename = f"model-{shard_idx + 1:05d}.safetensors"
# assume that new_size < 5e9
size += new_size
total_size += new_size
for k, v in sub_state_dict.items():
state_dict[k] = v
weight_map[k] = filename
save_file(state_dict, args.save_dir / filename)
json.dump(
dict(metadata=dict(total_size=total_size), weight_map=weight_map),
open(args.save_dir / "model.safetensors.index.json", "w"),
)

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{
"bos_token_id": 2,
"cache_implementation": "hybrid",
"do_sample": true,
"eos_token_id": [
1,
106
],
"pad_token_id": 0,
"top_k": 64,
"top_p": 0.95,
"transformers_version": "4.50.0.dev0"
}

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{
"do_convert_rgb": null,
"do_normalize": true,
"do_pan_and_scan": null,
"do_rescale": true,
"do_resize": true,
"image_mean": [
0.5,
0.5,
0.5
],
"image_processor_type": "Gemma3ImageProcessor",
"image_seq_length": 256,
"image_std": [
0.5,
0.5,
0.5
],
"pan_and_scan_max_num_crops": null,
"pan_and_scan_min_crop_size": null,
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"processor_class": "Gemma3Processor",
"resample": 2,
"rescale_factor": 0.00392156862745098,
"size": {
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"width": 896
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}

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{
"image_seq_length": 256,
"processor_class": "Gemma3Processor"
}

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{
"boi_token": "<start_of_image>",
"bos_token": {
"content": "<bos>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false
},
"eoi_token": "<end_of_image>",
"eos_token": {
"content": "<eos>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false
},
"image_token": "<image_soft_token>",
"pad_token": {
"content": "<pad>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false
},
"unk_token": {
"content": "<unk>",
"lstrip": false,
"normalized": false,
"rstrip": false,
"single_word": false
}
}

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