update int8 onnx model and readme

Signed-off-by: dujun <jun.du@intel.com>

README.md

@@ -50,12 +50,14 @@ This is an INT8 ONNX model quantized with [Intel® Neural Compressor](https://gi
 
 The original fp32 model comes from the fine-tuned model [Intel/bert-base-uncased-mrpc](https://huggingface.co/Intel/bert-base-uncased-mrpc).
 
+The calibration dataloader is the eval dataloader. The calibration sampling size is 100.
+
 #### Test result
 
 |   |INT8|FP32|
 |---|:---:|:---:|
-| **Accuracy (eval-f1)** |0.8963|0.9042|
-| **Model size (MB)**  |231|418|
+| **Accuracy (eval-f1)** |0.9021|0.9042|
+| **Model size (MB)**  |236|418|
 
 
 #### Load ONNX model:

model.onnx

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:9de45b1909b8e194fff06788df9c33faa9eac4ab5a0ce25667964be0a65e75d8
-size 241845626
+oid sha256:95d79d0083517ba6280f566add4624c6533eddf5e2d156d3bec64d0d049af637
+size 247160325