b11273

model : support classifier_pooling for rerankers (#29627)

• model : support classifier_pooling for ModernBERT rerankers

Assisted-by: Claude Opus 5.5

• model : read classifier pooling type in load_hparams

Write classifier.pooling_type from _try_set_pooling_type whenever the
config has classifier_pooling, and read it in
llama_model_base::load_hparams. ModernBERT falls back to mean when it
is unspecified.

Assisted-by: Claude Opus 5.5

• conversion : only accept cls and mean for classifier_pooling

Assisted-by: Claude Opus 5.5

• model : rename classifier_pooling_type to pooling_type_cls

Assisted-by: Claude Opus 5.5

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/51383584

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
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• Ubuntu x64 (CPU)
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• Ubuntu x64 (CUDA 13) - CUDA 13.4 libraries
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• Windows x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (ROCm 10.0)

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UI:

• UI