fundamentalvision/BEVFormer

BEVFormer-small (R101-DCN backbone) detects 3D objects in the ten nuScenes classes from six surround-view cameras.

BEVFormer is by Zhiqi Li et al. (arXiv:2203.17270), Apache-2.0, at fundamentalvision/BEVFormer; the TensorRT export and plugins are from DerryHub/BEVFormer_tensorrt, Apache-2.0.

Methodology

Latency: trtexec GPU compute time of the TensorRT 8.5.1.7 FP16 engine on the NVIDIA L4, batch 1, one nuScenes sample (six cameras); mean, p99 and throughput from the same run.

Accuracy: NDS and mAP on the 6,019-sample nuScenes validation set, evaluated in PyTorch FP16 on an NVIDIA L4 with BEVFormer_tensorrt’s bevformer_small_trt_p config, not on the device engine. The BEVFormer model zoo’s numbers are shown beside it.

Build: exported to ONNX with DerryHub/BEVFormer_tensorrt and compiled on the device with trtexec --fp16 and its plugin library, which the runtime image carries. No Embedl optimization.

Files

Artifacts

What ships in the model bundle.

File	Kind	Size	sha256
TensorRT engine engine/bevformer_small_trt_p_cp_trtexec.engine	Engine	124.0 MiB	4b6241cf5346
trtexec build log logs/trtexec_build.log	Log	5.9 MiB	38a38f2d04d5
HTTP server for the engine (serve.sh --port 8000) engine/serve.sh	script	2 KiB	c59eaebcab93
Model settings bevformer.json	Config	394 B	bd79c1d1af32
Latency (trtexec) benchmark/metrics.json	Results	4 KiB	664b85c342c8
Accuracy (PyTorch, on the host) benchmark/accuracy.json	Results	269 B	e28f25d1f5bf
nuScenes sample (engine inputs, .npz) inference/nuscenes_sample.npz	sample	86.7 MiB	a261a50479a5
Detections for the sample inference/detections.json	Results	101 KiB	9248aab2e23f
BEVFormer_tensorrt licence LICENSE-BEVFormer_tensorrt	license	11 KiB	c71d239df917

Variants

Every build of BEVFormer-small on L4.

Variant	Precision	Speed	Runtime
Baseline This page	FP16	116.73 ms	TensorRT 8.5.1.7 with BEVFormer_tensorrt plugins bevformer.l4.runtime.amd64.202610130739ec55
Embedl-optimized	INT8	111.91 ms	TensorRT 8.5.1.7 with BEVFormer_tensorrt plugins and Embedl optimizations bevformer.l4.runtime.amd64.202610130739ec55