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LeanMlir.Proofs.Nets.ViT.ViTFoldG

ViT-Tiny un-fused embedding-gradient nodes at the per-example index #

Two per-example lemmas that ViTFoldGB lifts over the batch: the positional-table gradient (posEmbedGrad_den) and the CLS-token gradient (clsGrad_den), each den-faithful at the RAW gradient node every optimizer tail consumes. The fusion is rfl (StableHLO.lean's *Sgd_eq_grad family), so each proof is its fused peer's (ViTPoC.posEmbedSgd_den, ViTTiePoC.vit_cls_den) with the θ − lr· wrapper dropped. Every Adam artifact of this net renders from the batched chain; its fold is ViTFoldGB.

source
theorem Proofs.ViTPoCG.posEmbedGrad_den {ic H W P N D : ℕ} (cotN : String) (Wc : Kernel4 D ic P P) (bc cls : Vec D) (pos : Mat (N + 1) D) (img : Vec (ic * H * W)) (dy : Vec ((N + 1) * D)) (i : Fin ((N + 1) * D)) :
StableHLO.den (StableHLO.SHlo.operand cotN dy).posEmbedGrad i = ∑ j : Fin ((N + 1) * D), pdiv (fun (p : Vec ((N + 1) * D)) => patchEmbed_flat ic H W P N D Wc bc cls (Mat.unflatten p) img) pos.flatten i j * dy j

Positional-embed GRADIENT denotes the certified gradient — the cotangent itself, since the positional table is added to every token and its Jacobian is the identity.

source
theorem Proofs.ViTPoCG.clsGrad_den (cotN : String) (Wc : Kernel4 192 3 16 16) (bc cls : Vec 192) (pos : Mat 197 192) (img : Vec (3 * 224 * 224)) (dyEmbed : Vec (197 * 192)) (i : Fin 192) :
StableHLO.den (StableHLO.SHlo.operand cotN (StableHLO.clsSliceFlat 196 192 dyEmbed)).denseBiasGradB i = ∑ j : Fin (197 * 192), pdiv (fun (cl : Vec 192) => patchEmbed_flat 3 224 224 16 196 192 Wc bc cl pos img) cls i j * dyEmbed j

CLS-token GRADIENT denotes the certified gradient. The render slices row 0 of the embed cotangent (clsSliceF) and then reduces it as a [1, D] batch, so the op is denseBiasGradB at N = 1 and its den IS cls_token_grad. ⚠ Stated at the committed ViT-Tiny dims rather than generically, for the reason ViTTiePoC.vit_cls_den is: the operand's type is Vec (1 * D), which reduces to Vec D only at a literal D.

⭐ The fused peer's proof ends in vit_render_cls_certified, whose statement carries the θ − lr· wrapper and has no un-wrapped twin; instantiating it at lr = 1 un-fuses it, which is the same content as a *Sgd_eq_grad rfl read backwards.