fix context size check in sglang model

[xgwang]

1. add exact the same logic as in vllm model. otherwise it will fail in sglang with confusing error
2. it is duplicated now, shall we look into any improvement?

[clefourrier]

Hi, thanks for the fix!
I'm approving for now but I think @NathanHB 's working on a refacto of a number of legacy items in the code and hopefully we'll have a better system for this once it's merged

[HuggingFaceDocBuilderDev]

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[xgwang]

Hi, thanks for the fix! I'm approving for now but I think @NathanHB 's working on a refacto of a number of legacy items in the code and hopefully we'll have a better system for this once it's merged

great to hear that.