---
license: other
license_name: per-model-see-license-files
tags:
  - onnx
  - xberg
---

# Captioning Models (experimental candidates)

Unmodified copies of permissively licensed upstream ONNX exports, staged by [xberg](https://github.com/xberg-io/xberg) for evaluation (xberg-io/xberg#2334, #2336). **Experimental candidates, not qualified**: no model here is an xberg default, a supported preset or a bundling decision.

| Directory | Upstream | Upstream revision | License | Task |
|---|---|---|---|---|
| `smolvlm-256m-instruct` | [HuggingFaceTB/SmolVLM-256M-Instruct](https://huggingface.co/HuggingFaceTB/SmolVLM-256M-Instruct) | `7e3e67edbbed1bf9888184d9df282b700a323964` | Apache-2.0 | image captioning (vision_encoder + embed_tokens + decoder_model_merged) |
| `smolvlm-500m-instruct` | [HuggingFaceTB/SmolVLM-500M-Instruct](https://huggingface.co/HuggingFaceTB/SmolVLM-500M-Instruct) | `a7da5b986cb59b408707209984f360a5f4ad7e47` | Apache-2.0 | image captioning (vision_encoder + embed_tokens + decoder_model_merged) |
| `florence-2-base` | [onnx-community/Florence-2-base](https://huggingface.co/onnx-community/Florence-2-base) | `d59e079711c57174f29265539fb4cc9f0f335916` | MIT | image captioning (vision_encoder + embed_tokens + encoder_model + decoder_model_merged) |

Every directory keeps the upstream `LICENSE` text (`LICENSE`), the upstream model card (`UPSTREAM_README.md`), tokenizer, processor and generation configuration, and all graphs the pipeline needs. `manifest.json` lists the SHA-256 and size of every file and the upstream revision it was copied from. Consumers must pin this repository's commit revision (recorded in `crates/xberg/src/candidate_models/`) and verify the SHA-256 values; do not resolve `main`.

Attribution: each model remains the work of its upstream authors under the license listed above. Notes per model:

- `smolvlm-256m-instruct`: Official upstream ONNX export; fp32 and int8 graphs. Base models: SmolLM2 (Apache-2.0), SigLIP (Apache-2.0).
- `smolvlm-500m-instruct`: Official upstream ONNX export; fp32 and int8 graphs. Base models: SmolLM2 (Apache-2.0), SigLIP (Apache-2.0).
- `florence-2-base`: onnx-community export of microsoft/Florence-2-base (rev 5ca5edf5bd017b9919c05d08aebef5e4c7ac3bac); fp32 and int8 graphs; non-merged decoders omitted.