onnxruntime

80a23527 - Fix round_prefer_ceil nearest mode for negative halfway values in Resize op (#28345)

Fix round_prefer_ceil nearest mode for negative halfway values in Resize op (#28345) ### Description `ROUND_PREFER_CEIL` in the Resize operator used bare `std::round`/`roundf`, which rounds away from zero. This is correct for positive halfway values (e.g., `round(0.5) = 1 = ceil(0.5)`) but wrong for negative halfway values (e.g., `round(-0.5) = -1`, but `ceil(-0.5) = 0`). Negative coordinates occur naturally with the `half_pixel` coordinate transformation mode for the first output pixels when upsampling. Added an explicit negative-halfway check, mirroring the existing positive-halfway check in `ROUND_PREFER_FLOOR`: ```cpp // CPU (upsamplebase.h) case ROUND_PREFER_CEIL: return [](float x_original, bool) { if (x_original == static_cast<int64_t>(x_original) - 0.5f) { return static_cast<int64_t>(std::ceil(x_original)); } return static_cast<int64_t>(std::round(x_original)); }; ``` Same fix applied to the CUDA implementation (`resize_impl.cu`). Added two test cases in `resize_op_test.cc`: 1. `ResizeOpNearestUpSample_RoundPreferCeil_HalfPixel` — exercises non-integer scale (26→64) from the original issue report, verifying correct source pixel selection at fractional boundaries. 2. `ResizeOpNearestUpSample_RoundPreferCeil_HalfPixel_2x2to7x8` — exercises a positive 0.5 boundary where `round_prefer_ceil` selects ceiling. ### Motivation and Context The `round_prefer_floor` path already had an explicit halfway-case override (for positive values where `std::round` disagrees with floor). The `round_prefer_ceil` path was missing the symmetric fix for negative values, violating the ONNX spec semantics of "at ties, prefer ceiling." --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: tianleiwu <30328909+tianleiwu@users.noreply.github.com> Co-authored-by: Tianlei Wu <tlwu@microsoft.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>