Meridian Highway-Perception v3
32%Production highway-perception detector — pedestrians, cars, motorcycles, trucks, lane delimiters. Same checkpoint we ship in Tier-1 cars.
Discussion
Issues, PRs, and methodology questions on Meridian Highway-Perception v3. Chip-vendor authors and reference-set maintainers are auto-pinged on threads tagged with their target.
INT4 calibration recipe — overshoot on long-tail classes?
The published INT4 calibration set is heavily weighted to head classes. We’re seeing a 6.4% drop on long-tail traffic categories vs the FP16 baseline; switching to a stratified calibration sample fully recovers it. Recipe attached.
Hailo-10H performance on multi-stream — 4x1080p hits a wall at 38 FPS
Posting matched-pair numbers. We see 38.2 FPS sustained across 4 1080p streams on the Hailo-10H with the published HEF — the bottleneck is the post-processing thread, not the NPU. PR with a fused NMS path coming.
ONNX export breaks dynamic shapes >1024
Repro: any input axis above 1024 fails the symbolic shape inference pass. Workaround in the meantime is to fix the pre-shape; will open an issue upstream.
Proposed: split FP16 and MIXED variants into separate model entries
The MIXED variant has materially different downstream behavior on transformer-class chips (latency goes down, accuracy retention is +0.6pp). Splitting into a separate model card would let it compete on its own merits in the catalog.