Add script to evaluate face recognition by LFW (#72)

README.md

@@ -7,6 +7,16 @@ Note:
 - [face_recognition_sface_2021sep.onnx](./face_recognition_sface_2021sep.onnx) is converted from the model from https://github.com/zhongyy/SFace thanks to [Chengrui Wang](https://github.com/crywang).
 - Support 5-landmark warpping for now (2021sep)
 
+Results of accuracy evaluation with [tools/eval](../../tools/eval).
+
+| Models      | Accuracy | 
+|-------------|----------|
+| SFace       | 0.9940   |
+| SFace quant | 0.9932   |
+
+\*: 'quant' stands for 'quantized'.
+
+
 ## Demo
 
 ***NOTE***: This demo uses [../face_detection_yunet](../face_detection_yunet) as face detector, which supports 5-landmark detection for now (2021sep).
@@ -17,6 +27,7 @@ Run the following command to try the demo:
 python demo.py --input1 /path/to/image1 --input2 /path/to/image2
 ```
 
+
 ## License
 
 All files in this directory are licensed under [Apache 2.0 License](./LICENSE).