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Hello, community.

I've been struggling to convert PaddleOCR-VL-1.5 0.9B into onnx version. I hit a hard brick

Here's the summary:

Root Problem
We're trying to convert PaddleOCR-VL-1.5 (a custom VLM by PaddlePaddle) to ONNX for use in Bun.js via transformers.js.

Specific Problems

1. Custom architecture — PaddleOCRVLConfig is not registered in transformers' AutoModel registry, so standard export tools don't recognize it

2. Dependency hell — The conversion requires:

   • optimum 1.x for main_export API (moved to optimum-onnx in 2.x)
   • transformers >= 4.51 for the model's own code (masking_utils, create_causal_mask, etc.)
   • But optimum 1.x was written for transformers ~4.43 — these two requirements are mutually exclusive

3. Removed symbols — Every optimum 1.x file imports symbols that newer transformers deleted (is_tf_available, TF2_WEIGHTS_NAME, download_url, is_remote_url, get_parameter_dtype, SlidingWindowCache) — patching them one by one is endless

4. Model patches needed — The model itself needs patching (flash_attn hard import, rope_config_validation signature)

Can someone help me?