osobh
5c2ee63d53
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Persist accumulated WIP across rtx-tensor / rtx-transformers / rtx-runtime. Two related feature groups: GPU enablement (unblocks the Phase-3 spec §8 CUDA Mamba path): - rtx-tensor: `Tensor::cuda_device_ptr()` + storage GPU-buffer accessors (`raw_ptr.rs`) expose the raw CUdeviceptr that kernel launches need — the "rtx-tensor GPU memory access API" the Mamba CUDA kernels were blocked on. - rtx-transformers: `MambaBlock::forward_cuda` runs the four linear projections through cuBLAS on-device (in/out/x/dt_proj), keeping the selective scan + conv1d + activations on CPU; dispatched automatically from `forward` when on a CUDA device under the `cuda` feature. Updated `mamba_cuda_kernels.rs` accordingly. - supporting plumbing in rtx-runtime stream/bridge and rtx-tensor storage/conversion/concatenation/creation + rtx-flash-attention. Linear algebra (rtx-tensor): - `linalg/matrix_exp.rs`: real matrix exponential via scaling-and-squaring with a degree-13 Padé approximant (Higham 2005), f64 internally. - `complex/linalg.rs`: complex matmul/adjoint, Hermitian eigendecomposition (`ComplexEigenResult`), and the complex matrix exponential, nalgebra-backed. - tests for both. Builds verified on the CPU path (`cargo check -p rtx-tensor -p rtx-transformers -p rtx-runtime -p rtx-flash-attention` clean). The `cuda` feature and the rtx-backend-cuda NVCC build remain unbuildable on this host (CUDA/glibc header mismatch) — pre-existing and unrelated to these changes.