transformers

fc78285f - Exporters: feed SDPA's boolean mask to ONNX as an additive one

Exporters: feed SDPA's boolean mask to ONNX as an additive one torchlib guards its boolean-mask softmax with an IsNaN/Where over the whole (query, key) weight matrix; the patch already zeroes fully masked rows, so the guard only costs time (2x on a 2520-patch vision attention on ORT CPU). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>