4 Commits

Include renames

Author	SHA1	Message	Date
osobhandClaude Opus 4.8	96809d48a1	SMT D314 (rustytorch): gradcheck tanh/sigmoid + GatedMemoryUpdater (GRU cell) ... F.1 — finite-difference gradchecks for tanh, sigmoid, and the exact gated composite (1-z)*m + z*c (z=sigmoid, c=tanh) added to tape_cpu_gradcheck.rs. All pass (rel-err < 2e-2) — the activation VJPs that already existed are now proven correct on the real CpuBackend (E0 discipline), so the gated cell can rely on them. F.2 — GatedMemoryUpdater: a GRU-style gated recurrent memory cell. z = sigmoid([M‖x]·W_z); c = tanh([M‖x]·W_c); M_t = (1-z)⊙M + z⊙c The convex update is a non-expansion (|M_t| ≤ max(|M_0|, 1)), so free rollout stays bounded with NO clamp — and the learned gate can both jump at a regime switch (z≈1) and hold+denoise in steady state (z≈0), which the residual+leaky ClonedMemoryUpdater cannot. Same method surface (new/step/predict/train_step/ train_step_memory) so the omni-think facade is cell-generic. Tests: gated cell trains (loss drops); 500-step free rollout stays in [-1,1] without a clamp. clippy(-D)/fmt clean. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>	2026-06-16 21:09:10 -07:00
osobhandClaude Opus 4.8	9a31a07cc9	rtx-autograd: training smoke tests proving the tape learns ... End-to-end training on `Autodiff<CpuBackend>` (forward → backward → extract grads → SGD → repeat), guarding the gradient-correctness fixes: - `mlp_trains_and_loss_decreases`: 2-layer MLP (matmul + gelu), loss 8.65 → 0.39. - `attention_set_encoder_learns_window_mean`: a minimal attention set-encoder (the SMT predictive-state teacher shape) learns to predict its input window's per-dim mean, loss 0.27 → ~0.0. The embedding fans out to Q/K/V and the residual (4 uses), so this also regression-guards the fan-out gradient accumulation fix inside a real attention block. All ops used are gradient-checked in `tape_cpu_gradcheck.rs`. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>	2026-06-15 21:24:56 -07:00
osobhandClaude Opus 4.8	fc895a2de5	rtx-autograd: make the tape correct + sound on real backends ... The decorator autograd (`Autodiff<B>`) had never been gradient-checked against a real tensor backend — the entire test suite runs on a shape-only `MockBackend` whose ops return their input, so they validate graph structure but never gradient values. Running it through `CpuBackend` for the first time (new `tests/tape_cpu_gradcheck.rs`, finite-difference checks) surfaced three bugs that made the tape unusable for training; this fixes all three. 1. Double-free / UB in the dimension-erasure cast. The backward ops cast a tensor to its runtime const-generic dimension via `mem::transmute_copy::<_, TensorPrimitive<N>>(&src)` in ~100 sites. That bit-copies the owned `Vec` without forgetting the source, so two values own one buffer → double-free on any heap-backed backend (and Stacked-Borrows UB from the typed pun). Replaced every site with a single `into_dim` helper that is now **fully safe** — it round-trips through `to_data`/`from_data` and rebuilds the shape with `array::from_fn`, no `unsafe` at all. (This is why the whole repo previously bypassed the tape with analytic backward.) 2. Fan-out gradients were silently dropped. `accumulate_gradients` was a stub that returned one path and discarded the other, and `AutodiffTensor::clone` minted a fresh `TensorId`. Together, reusing a tensor (residuals, `mul(s, s)`, shared Q/K/V — universal in transformers) split its gradient across two ids and summed neither, yielding a fraction of the true value. `accumulate_gradients` now sums via `B::add`; `clone` preserves the id so fan-out paths collide on one sink. 3. Softmax backward panicked. `SoftmaxBackward` / `stable_softmax_backward` subtracted a keep-dim row-sum from the full-shape grad, but the elementwise backends assert equal shapes (no broadcasting). Added `broadcast_along_dim` to tile the row-sum to full width first. Verified: `tape_cpu_gradcheck` (matmul, fan-out add·mul, softmax) passes with rel-err < 2e-2 vs central differences; full `rtx-autograd` suite green (263 passed, 0 failed); lib clippy `-D warnings` clean. Known follow-up (out of scope): `cargo miri test` still aborts on a Stacked-Borrows / integer-to-pointer violation inside `rtx-backend-cpu`'s buffer internals — a grad-free `from_data`+`add`+`sum` probe reproduces the identical error, so it is pre-existing backend UB, not an autograd issue. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>	2026-06-15 21:06:32 -07:00
redclawsystems	4d88dc0584	Initial commit	2026-03-04 00:08:42 +00:00