[Gemma.cpp] Allows non-owned arguments for attention methods. #745
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[Gemma.cpp] Allows non-owned arguments for attention methods.
AttentionActivationPtrsthat holds non-owningMatPtrs. Acts as a view intoAttentionActivations.QBatchto hold non-owningMatPtrs to the kv caches.MatPtrTdefault constructor for simpler initializations.LayerWeightsPtrs::query_norm_scaledirectly. WhileLayerWeightsPtrsalready held non-owningMatPtrs, this change avoids the need to find and construct several empty weight tensors just to construct onequery_norm_scaletensor.