mamba2: remove hardcoded 2x expansion factor and invalid d_inner % d_state check (#23082)
* mamba2: remove hardcoded 2x expansion factor, support any expand value
* mamba2: remove invalid d_inner %% d_state check (unrelated parameters)
* Update convert_hf_to_gguf.py: make expand optional with default 2
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* mamba2: apply expand fix to refactored conversion/mamba.py
* also check for mamba_expand
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
Co-authored-by: Sigbjørn Skjæret <1629204+CISC@users.noreply.github.com>