Why weights of enigne model is INT8, while bias is FLOAT 32?

AI & Data Science Deep Learning (Training & Inference) TensorRT
1

I converted .onnx to engine file, but when I check graph json file, I saw that weights of layer have int8 format, bit bias has float format as follow:

Weights: {'Type': 'Int8', 'Count': 864}
Bias: {'Type': 'Float', 'Count': 32}

I think in one generated layers, weights and bias have to have the same format. How can I force to generate bias with int8 format to increase speed of engine model?
Thanks

2

Hi,

Could you please share with us complete verbose logs while building the engine and graph json file for better help.

Thank you.

3

@spolisetty I attached verbose logs when building engine and graph.json. I use this repo to build engine, it used Tensorrt Python API. It seems that, all biases is FP32 in engine model. Thanks
graph.json (239.4 KB)

log.md (7.2 KB)

4

Hi,
Request you to share the ONNX model and the script if not shared already so that we can assist you better.
Alongside you can try few things:

  1. validating your model with the below snippet

check_model.py

import sys
import onnx
filename = yourONNXmodel
model = onnx.load(filename)
onnx.checker.check_model(model).
2) Try running your model with trtexec command.

In case you are still facing issue, request you to share the trtexec “”–verbose"" log for further debugging
Thanks!

6

I use this repo (Tensorrt Python API GitHub - Linaom1214/TensorRT-For-YOLO-Series: tensorrt for yolo series (YOLOv8, YOLOv7, YOLOv6, YOLOv5), nms plugin support) to convert .onnx to .engine. If I enable -v for verbose in the repo, log is very long in terminal and I can not save all. Currently, I am not using trtexec to convert .onnx model to fp32 and .int8 engine.

7

@AakankshaS I checked with this code, nothing is in output. It means that my onnx model is valid.

8

@spolisetty @AakankshaS
Thanks. I used this repo GitHub - Linaom1214/TensorRT-For-YOLO-Series: tensorrt for yolo series (YOLOv8, YOLOv7, YOLOv6, YOLOv5), nms plugin support (tensorrt python API to convert .onnx to .int8 model) and I can log all verbose output. I attach .onnx file, graph.json file (weights is INT8 and bias is FLOAT in the same). How to fix in the Tensorrt Python API?
graph_new.json (238.5 KB)

log.txt (12.0 MB)

Because file .onnx is large (>100 MB), I attach drive link here to .onnx yolov7_cach3_KOdynamic.onnx - Google Drive you can download it.

9

@spolisetty @AakankshaS
Sorry, but is there any update? I am waiting for your guide.

10

Hi,

This is an expected behavior,. INT8 conv/gemm kernels use FP32 bias. Forcing bias into INT8 does not increase speed because the bias is already fused into conv/gemm kernels.

Thank you.

1 Like
11

Thank you so much.

12

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