qwen3 : bidirectional attention and dense_2 output projection (#30607)
* qwen3 : bidirectional attention and dense_2 output projection
Assisted-by: Grok
* convert : read use_bidirectional_attention in base
Assisted-by: Grok
* Update conversion/base.py
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@huggingface.co>