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jgrusewski 1c3eb3e331 refactor: eliminate GpuVarStore — DuelingWeightSet is zero-copy pointer view into params_buf

DuelingWeightSet and BranchingWeightSet fields changed from owned
CudaSlice<f32> to raw u64 device pointers + usize element counts.
This enables zero-copy views directly into the flat params_buf for
the training hot path (no D2D copies, no shadow allocations).

Key changes:
- Weight sets store u64 + usize pairs instead of CudaSlice<f32>
- from_flat_buffer() creates zero-copy views into params_buf
- from_slices() creates pointer views from owned CudaSlice allocations
- DuelingWeightBacking/BranchingWeightBacking hold owned CudaSlice
  arrays for callers that need independent allocations (experience
  collector, ensemble heads, tests)
- flatten/unflatten become no-ops when weight sets point into params_buf
- extract functions return (Backing, WeightSet) tuples
- KernelWeightPack::build() uses u64 fields directly (no raw_device_ptr)
- All sync functions updated for pointer-based signatures
- Ensemble clone functions return backing + pointer view pairs
- gradient_budget tests updated (7/7 pass)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-11 14:02:55 +02:00

baseline_common

fix(ml): wire spread_cost_bps into RL training — commission + spread = total tx cost

2026-03-01 22:10:43 +01:00

cuda_test.rs

fix: wire real GPU backprop + SPSA gradients, fix checkpoint loading, eliminate candle from examples

2026-03-20 15:41:42 +01:00

download_baseline.rs

fix: add retry with backoff to Databento download_quarter

2026-03-31 22:57:43 +02:00

evaluate_baseline.rs

refactor: eliminate GpuVarStore — DuelingWeightSet is zero-copy pointer view into params_buf