Add elu activation#6
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Adds vortx::linalg::{Activation (tanh + tanh_backward), Adam} and their shaders,
the GPU building blocks for MLP training (used by nexus RL demos / zealot-rl).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Add ELU to the activation kernels alongside the existing tanh: - gpu_elu / gpu_elu_backward (backward reuses the cached output: grad *= y>0 ? 1 : y+1, same formulation as gpu_tanh_backward) - gpu_elu_vec4 (4-wide ELU; host reinterprets the f32 buffer as glamx::Vec4) -- pulls in glamx as a dependency - host Activation::elu / elu_backward / elu_vec4 wrappers - export GpuElu, GpuEluBackward, GpuEluVec4 Needed for zealot's all-GPU PPO policy (ActorCritic uses ELU hidden activations). Verified bit-exact vs the CPU ELU/elu_grad in zealot-rl (~1e-7). Note: the one-line glamx Cargo.toml dependency is shared with the PPO-kernels and GEMM-vec4 branches; whichever lands first, the others need a trivial rebase of that line. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Add multiple activation kernels!