Add rope_theta to rope_scaling for transformers 5.4+ compatibility

#19

transformers==5.4.0 validates that rope_theta is present inside rope_scaling before the migration from the top-level field runs, causing a KeyError when loading the config without trust_remote_code=True. Adds rope_theta inside rope_scaling while keeping the top-level value for backwards compatibility with transformers v4.

oliverholworthy changed pull request title from Update rope params to Add rope_theta to rope_scaling for transformers 5.4+ compatibility
oliverholworthy changed pull request status to open
oliverholworthy changed pull request status to merged

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