initial 4-bit ONNX export (DiT + T5Gemma encoder + SAME-S decoder)

.gitattributes

@@ -33,3 +33,12 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.zip filter=lfs diff=lfs merge=lfs -text
 *.zst filter=lfs diff=lfs merge=lfs -text
 *tfevents* filter=lfs diff=lfs merge=lfs -text
+onnx/decoder_q4_chunk_0.data filter=lfs diff=lfs merge=lfs -text
+onnx/dit_q4_chunk_0.data filter=lfs diff=lfs merge=lfs -text
+onnx/dit_q4_chunk_1.data filter=lfs diff=lfs merge=lfs -text
+onnx/dit_q4_chunk_2.data filter=lfs diff=lfs merge=lfs -text
+onnx/dit_q4_chunk_3.data filter=lfs diff=lfs merge=lfs -text
+onnx/text_encoder_q4_chunk_0.data filter=lfs diff=lfs merge=lfs -text
+onnx/text_encoder_q4_chunk_1.data filter=lfs diff=lfs merge=lfs -text
+onnx/text_encoder_q4_chunk_2.data filter=lfs diff=lfs merge=lfs -text
+tokenizer/tokenizer.json filter=lfs diff=lfs merge=lfs -text

LICENSE.md

@@ -0,0 +1,58 @@
+STABILITY AI COMMUNITY LICENSE AGREEMENT
+	
+Last Updated: July 5, 2024
+
+1. INTRODUCTION
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+
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+“Trade Control Laws” means any applicable U.S. and non-U.S. export control and trade sanctions laws and regulations.

LICENSE_GEMMA.md

@@ -0,0 +1,206 @@
+# Gemma Terms of Use
+
+The terms below apply to Gemma models listed in the Appendix at bottom of this page. For Gemma 4 terms, see the [Gemma 4 license](https://ai.google.dev/gemma/apache_2).
+
+Last modified: April 1, 2026
+
+By using, reproducing, modifying, distributing, performing or displaying any
+portion or element of Gemma, Model Derivatives including via any Hosted Service,
+(each as defined below) (collectively, the "**Gemma Services**") or otherwise
+accepting the terms of this Agreement, you agree to be bound by this Agreement.
+
+## Section 1: DEFINITIONS
+
+### 1.1 Definitions
+
+(a) "**Agreement** " or "**Gemma Terms of Use**" means these terms and conditions
+that govern the use, reproduction, Distribution or modification of the Gemma
+Services and any terms and conditions incorporated by reference.
+
+(b) "**Distribution** " or "**Distribute** " means any transmission, publication,
+or other sharing of Gemma or Model Derivatives to a third party, including by
+providing or making Gemma or its functionality available as a hosted service via
+API, web access, or any other electronic or remote means ("**Hosted Service**").
+
+(c) "**Gemma** " means the set of machine learning language models, trained model
+weights and parameters identified in the [Appendix](https://ai.google.dev/gemma/terms#appendix),
+regardless of the source that you obtained it from.
+
+(d) "**Google**" means Google LLC.
+
+(e) "**Model Derivatives**" means all (i) modifications to Gemma, (ii) works based
+on Gemma, or (iii) any other machine learning model which is created by transfer
+of patterns of the weights, parameters, operations, or Output of Gemma, to that
+model in order to cause that model to perform similarly to Gemma, including
+distillation methods that use intermediate data representations or methods based
+on the generation of synthetic data Outputs by Gemma for training that model.
+For clarity, Outputs are not deemed Model Derivatives.
+
+(f) "**Output**" means the information content output of Gemma or a Model
+Derivative that results from operating or otherwise using Gemma or the Model
+Derivative, including via a Hosted Service.
+
+### 1.2
+
+As used in this Agreement, "**including** " means
+"**including without limitation**".
+
+## Section 2: ELIGIBILITY AND USAGE
+
+### 2.1 Eligibility
+
+You represent and warrant that you have the legal capacity to enter into this
+Agreement (including being of sufficient age of consent). If you are accessing
+or using any of the Gemma Services for or on behalf of a legal entity, (a) you
+are entering into this Agreement on behalf of yourself and that legal entity,
+(b) you represent and warrant that you have the authority to act on behalf of
+and bind that entity to this Agreement and (c) references to "**you** " or
+"**your**" in the remainder of this Agreement refers to both you (as an
+individual) and that entity.
+
+### 2.2 Use
+
+You may use, reproduce, modify, Distribute, perform or display any of the Gemma
+Services only in accordance with the terms of this Agreement, and must not
+violate (or encourage or permit anyone else to violate) any term of this
+Agreement.
+
+## Section 3: DISTRIBUTION AND RESTRICTIONS
+
+### 3.1 Distribution and Redistribution
+
+You may reproduce or Distribute copies of Gemma or Model Derivatives if you meet
+all of the following conditions:
+
+1. You must include the use restrictions referenced in Section 3.2 as an enforceable provision in any agreement (e.g., license agreement, terms of use, etc.) governing the use and/or distribution of Gemma or Model Derivatives and you must provide notice to subsequent users you Distribute to that Gemma or Model Derivatives are subject to the use restrictions in Section 3.2.
+2. You must provide all third party recipients of Gemma or Model Derivatives a copy of this Agreement.
+3. You must cause any modified files to carry prominent notices stating that you modified the files.
+4. All Distributions (other than through a Hosted Service) must be accompanied by a "**Notice** " text file that contains the following notice: "**Gemma is provided under and subject to the Gemma Terms of Use found at ai.google.dev/gemma/terms**".
+
+You may add your own intellectual property statement to your modifications and,
+except as set forth in this Section, may provide additional or different terms
+and conditions for use, reproduction, or Distribution of your modifications, or
+for any such Model Derivatives as a whole, provided your use, reproduction,
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+Agreement.
+
+### 3.2 Use Restrictions
+
+You must not use any of the Gemma Services:
+
+1. for the restricted uses set forth in the Gemma Prohibited Use Policy at [ai.google.dev/gemma/prohibited_use_policy](https://ai.google.dev/gemma/prohibited_use_policy) ("**Prohibited Use Policy**"), which is hereby incorporated by reference into this Agreement; or
+2. in violation of applicable laws and regulations.
+
+To the maximum extent permitted by law, Google reserves the right to restrict
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+### 3.3 Generated Output
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+
+## Section 4: ADDITIONAL PROVISIONS
+
+### 4.1 Updates
+
+Google may update Gemma from time to time.
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+### 4.2 Trademarks
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+Nothing in this Agreement grants you any rights to use Google's trademarks,
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+### 4.3 DISCLAIMER OF WARRANTY
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+UNLESS REQUIRED BY APPLICABLE LAW, THE GEMMA SERVICES, AND OUTPUTS, ARE PROVIDED
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+EXPRESS OR IMPLIED, INCLUDING ANY WARRANTIES OR CONDITIONS OF TITLE,
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+SOLELY RESPONSIBLE FOR DETERMINING THE APPROPRIATENESS OF USING, REPRODUCING,
+MODIFYING, PERFORMING, DISPLAYING OR DISTRIBUTING ANY OF THE GEMMA SERVICES
+OR OUTPUTS AND ASSUME ANY AND ALL RISKS ASSOCIATED WITH YOUR USE OR DISTRIBUTION
+OF ANY OF THE GEMMA SERVICES OR OUTPUTS AND YOUR EXERCISE OF RIGHTS AND
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+### 4.4 LIMITATION OF LIABILITY
+
+TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT AND UNDER NO
+LEGAL THEORY, WHETHER IN TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY,
+CONTRACT, OR OTHERWISE, UNLESS REQUIRED BY APPLICABLE LAW, SHALL GOOGLE OR ITS
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+SPECIAL, INCIDENTAL, EXEMPLARY, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR LOST
+PROFITS OF ANY KIND ARISING FROM THIS AGREEMENT OR RELATED TO, ANY OF THE GEMMA
+SERVICES OR OUTPUTS EVEN IF GOOGLE OR ITS AFFILIATES HAVE BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+### 4.5 Term, Termination, and Survival
+
+The term of this Agreement will commence upon your acceptance of this Agreement
+(including acceptance by your use, modification, or Distribution, reproduction,
+performance or display of any portion or element of the Gemma Services) and will
+continue in full force and effect until terminated in accordance with the terms
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+and cease use and Distribution of all copies of Gemma and Model Derivatives in
+your possession or control. Sections 1, 2.1, 3.3, 4.2 to 4.9 shall survive the
+termination of this Agreement.
+
+### 4.6 Governing Law and Jurisdiction
+
+This Agreement will be governed by the laws of the State of California without
+regard to choice of law principles. The UN Convention on Contracts for the
+International Sale of Goods does not apply to this Agreement. The state and
+federal courts of Santa Clara County, California shall have exclusive
+jurisdiction of any dispute arising out of this Agreement.
+
+### 4.7 Severability
+
+If any provision of this Agreement is held to be invalid, illegal or
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+valid as if such provision had not been set forth herein.
+
+### 4.8 Entire Agreement
+
+This Agreement states all the terms agreed between the parties and supersedes
+all other agreements between the parties as of the date of acceptance relating
+to its subject matter.
+
+### 4.9 No Waiver
+
+Google will not be treated as having waived any rights by not exercising (or
+delaying the exercise of) any rights under this Agreement.
+
+## Appendix
+
+- [Gemma 1](https://ai.google.dev/gemma/docs/core/model_card)
+- [Gemma 1.1](https://ai.google.dev/gemma/docs/core/model_card)
+- [Gemma 2](https://ai.google.dev/gemma/docs/core/model_card_2)
+- [Gemma 3](https://ai.google.dev/gemma/docs/core/model_card_3)
+- [Gemma 3n](https://ai.google.dev/gemma/docs/3n)
+- [FunctionGemma](https://ai.google.dev/gemma/docs/functiongemma)
+- [EmbeddingGemma](https://ai.google.dev/gemma/docs/embeddinggemma)
+- [PaliGemma](https://ai.google.dev/gemma/docs/paligemma/model-card)
+- [PaliGemma 2](https://ai.google.dev/gemma/docs/paligemma/model-card-2)
+- [ShieldGemma](https://ai.google.dev/gemma/docs/shieldgemma/model_card)
+- [ShieldGemma 2](https://ai.google.dev/gemma/docs/shieldgemma/model_card_2)
+- [CodeGemma](https://ai.google.dev/gemma/docs/codegemma/model_card)
+- [CodeGemma 1.1](https://ai.google.dev/gemma/docs/codegemma/model_card)
+- [Gemma 2 JPN](https://huggingface.co/google/gemma-2-2b-jpn-it)
+- [DataGemma RIG](https://www.kaggle.com/models/google/datagemma-rig)
+- [DataGemma RAG](https://www.kaggle.com/models/google/datagemma-rag)
+- [RecurrentGemma](https://ai.google.dev/gemma/docs/recurrentgemma/model_card)
+- [Gemma Scope](https://ai.google.dev/gemma/docs/gemma_scope)
+- [Gemma-APS](https://ai.google.dev/gemma/docs/gemma-aps)
+- [T5Gemma](https://www.kaggle.com/models/google/t5gemma)
+- [VaultGemma](https://www.kaggle.com/models/google/vaultgemma)
+- [FunctionGemma](https://www.kaggle.com/models/google/functiongemma)
+- [T5Gemma 2](https://www.kaggle.com/models/google/t5gemma-2)
+- [TranslateGemma](https://www.kaggle.com/models/google/translategemma)
+
+> [!NOTE]
+> **Note:** Previous versions of these Terms are [archived here](https://ai.google.dev/gemma/terms-archive).

NOTICE

@@ -0,0 +1 @@
+Gemma is provided under and subject to the Gemma Terms of Use found at ai.google.dev/gemma/terms

README.md

@@ -0,0 +1,95 @@
+---
+license: other
+license_name: stability-ai-community-license
+license_link: LICENSE.md
+tags:
+  - audio
+  - text-to-audio
+  - music-generation
+  - stable-audio
+  - onnx
+  - q4
+  - matmulnbits
+  - transformers.js
+  - onnxruntime-web
+library_name: onnxruntime
+base_model: stabilityai/stable-audio-3-small-music
+---
+
+# stable-audio-3-small-music — 4-bit ONNX bundle for the browser
+
+Quantized **ONNX** export of [`stabilityai/stable-audio-3-small-music`](https://huggingface.co/stabilityai/stable-audio-3-small-music) (Stability AI Community License) intended to run end-to-end in a web browser via [`onnxruntime-web`](https://www.npmjs.com/package/onnxruntime-web).
+
+All weight-bearing MatMul/Linear nodes are quantized to **int4 MatMulNBits** with `block_size=16`, embedding tables are quantized as **GatherBlockQuantized**, and remaining initializers (LayerNorm/RMSNorm scales, biases, Conv1d kernels) stay in fp32. External-data sidecars are split into multiple files ≤ 100 MB each.
+
+The bundle is a drop-in for the demo at <https://github.com/lsb/stable-audio-3-small-music-onnx> (or whatever public copy lives alongside it).
+
+## Files
+
+```
+onnx/
+  text_encoder_q4.onnx      + text_encoder_q4_chunk_{0..N}.data
+  dit_q4.onnx               + dit_q4_chunk_{0..N}.data
+  decoder_q4.onnx           + decoder_q4_chunk_{0..N}.data
+  *_chunks.json              browser-side weight manifest
+tokenizer/                   T5Gemma tokenizer files (drop-in for @huggingface/transformers)
+number_conditioner.npz       weights for the duration scalar embedder
+config.json                  runtime config consumed by the browser
+LICENSE.md LICENSE_GEMMA.md NOTICE
+```
+
+Total bundle size: about **640 MB** of int4 weights spread across 8 chunks.
+
+## Inference shape
+
+- Latent: `(1, 256, T_lat)` where `T_lat = ceil((seconds + 6) * 44100 / 8192) * 2`
+- Cross-attention conditioning: `(1, 257, 768)` (256 T5Gemma tokens + 1 duration embedding)
+- Global conditioning (adaLN): `(1, 768)` (duration embedding)
+- Local-add conditioning (inpaint): `(1, 257, T_lat)` (zeros for plain text-to-audio)
+- Padding mask: `(1, T_lat)` boolean
+- Output (decoder): `(1, 2, T_lat * 4096)` stereo audio at 44.1 kHz, clamped to [-1, 1]
+
+## Sampler
+
+`rf_denoiser` objective with the **pingpong** sampler (5 lines of arithmetic — ported to JS in the demo):
+
+```
+denoised = x - t_curr * dit(x, t_curr, …)
+x = (1 - t_next) * denoised + t_next * randn_like(x)
+```
+
+Schedule comes from `LogSNRShift(rate=0, anchor_logsnr=-6.2, logsnr_end=2.0)` — sequence-length-invariant, so the same closed-form formula works for any duration. Default 8 steps. CFG is disabled at inference time (`cfg_scale=1.0` in the original).
+
+## Browser usage (sketch)
+
+```html
+<script type="module">
+  import * as ort from "https://cdn.jsdelivr.net/npm/onnxruntime-web@1.21.0/dist/esm/ort.min.js";
+  import { AutoTokenizer } from "https://cdn.jsdelivr.net/npm/@huggingface/transformers";
+  ort.env.wasm.numThreads = 1;
+
+  const base = "https://huggingface.co/lsb/stable-audio-3-small-music-onnx/resolve/main";
+  const manifest = await fetch(`${base}/onnx/dit_q4_chunks.json`).then(r => r.json());
+  const ditBuf = await fetch(`${base}/onnx/dit_q4.onnx`).then(r => r.arrayBuffer());
+  const externalData = await Promise.all(manifest.chunks.map(async c => ({
+    path: c.name,
+    data: new Uint8Array(await (await fetch(`${base}/onnx/${c.name}`)).arrayBuffer()),
+  })));
+  const sess = await ort.InferenceSession.create(new Uint8Array(ditBuf), {
+    executionProviders: ["wasm"],
+    externalData,
+  });
+</script>
+```
+
+See the demo source for the full pipeline (tokenizer → text encoder → pingpong loop → decoder → WAV).
+
+## Quality / performance
+
+- Per-graph q4 vs fp32 SNR (single forward pass): DiT ~10 dB, decoder ~15 dB, text encoder ~13 dB.
+- End-to-end vs the PyTorch fp32 reference: envelope correlation ≈ 0.88 on the same prompt/seed — same musical structure, slightly more high-frequency artifacts.
+- Single-threaded WASM on an M-series Mac: roughly 60–120 s wall-clock for a 10 s clip at 8 steps. WebGPU would be much faster but is intentionally not used here so the bundle works from any static host.
+
+## License
+
+This bundle inherits the **Stability AI Community License** from the upstream weights. The T5Gemma encoder weights additionally fall under Google's **Gemma Terms of Use**. Both license files are included verbatim; see `NOTICE` for the combined attribution.

config.json

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+{
+  "name": "stable-audio-3-small-music",
+  "upstream": "https://huggingface.co/stabilityai/stable-audio-3-small-music",
+  "license": "Stability AI Community License",
+  "sample_rate": 44100,
+  "io_channels": 256,
+  "downsampling_ratio": 4096,
+  "cond_dim": 768,
+  "global_cond_dim": 768,
+  "local_add_cond_dim": 257,
+  "cross_attn_seq_len": 257,
+  "text_max_length": 256,
+  "audio_align": 8192,
+  "default_seconds": 10,
+  "default_steps": 8,
+  "schedule": {
+    "type": "logsnr",
+    "rate": 0,
+    "anchor_logsnr": -6.2,
+    "logsnr_end": 2.0
+  },
+  "duration_embedder": {
+    "type": "number_conditioner_expo_fourier",
+    "dim": 256,
+    "f_min": 0.5,
+    "f_max": 10000.0,
+    "weights": "number_conditioner.npz",
+    "min_val": 0,
+    "max_val": 384
+  },
+  "graphs": {
+    "text_encoder": {
+      "manifest": "onnx/text_encoder_q4_chunks.json",
+      "padding_mode": "learned",
+      "hidden_size": 768
+    },
+    "dit": {
+      "manifest": "onnx/dit_q4_chunks.json",
+      "depth": 20,
+      "embed_dim": 1024,
+      "num_memory_tokens": 64
+    },
+    "decoder": {
+      "manifest": "onnx/decoder_q4_chunks.json",
+      "audio_channels": 2
+    }
+  }
+}

number_conditioner.npz

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onnx/decoder_q4.onnx

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onnx/decoder_q4_chunk_0.data

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onnx/decoder_q4_chunks.json

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+      "name": "decoder_q4_chunk_0.data",
+      "size": 44894208
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+}

onnx/dit_q4.onnx

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onnx/dit_q4_chunk_0.data

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onnx/dit_q4_chunk_1.data

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onnx/dit_q4_chunk_2.data

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onnx/dit_q4_chunk_3.data

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onnx/dit_q4_chunks.json

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+      "name": "dit_q4_chunk_0.data",
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+  "total_weight_mb": 380.15
+}

onnx/shard_summary.json

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+{
+  "dit_q4": {
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+        "size": 84451328
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+    "total_weight_mb": 380.15
+  },
+  "decoder_q4": {
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+        "size": 44894208
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+    "total_weight_mb": 44.89
+  },
+  "text_encoder_q4": {
+    "model": "text_encoder_q4.onnx",
+    "chunks": [
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+        "name": "text_encoder_q4_chunk_0.data",
+        "size": 98304000
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onnx/text_encoder_q4.onnx

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onnx/text_encoder_q4_chunks.json

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tokenizer/tokenizer.json

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tokenizer/tokenizer_config.json

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+{
+  "backend": "tokenizers",
+  "bos_token": "<bos>",
+  "clean_up_tokenization_spaces": false,
+  "eos_token": "<eos>",
+  "is_local": false,
+  "local_files_only": false,
+  "mask_token": "<mask>",
+  "model_max_length": 1000000000000000019884624838656,
+  "pad_token": "<pad>",
+  "padding_side": "right",
+  "sp_model_kwargs": {},
+  "spaces_between_special_tokens": false,
+  "tokenizer_class": "GemmaTokenizer",
+  "unk_token": "<unk>",
+  "use_default_system_prompt": false
+}