[Bug Fix] Modify TRT dynamic shape in PP-OCRv2 example. (#769)

* Imporve OCR Readme

* Improve OCR Readme

* Improve OCR Readme

* Improve OCR Readme

* Improve OCR Readme

* Add Initialize function to PP-OCR

* Add Initialize function to PP-OCR

* Add Initialize function to PP-OCR

* Make all the model links come from PaddleOCR

* Improve OCR readme

* Improve OCR readme

* Improve OCR readme

* Improve OCR readme

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add Readme for vision results

* Add check for label file in postprocess of Rec model

* Add check for label file in postprocess of Rec model

* Add check for label file in postprocess of Rec model

* Add check for label file in postprocess of Rec model

* Add check for label file in postprocess of Rec model

* Add check for label file in postprocess of Rec model

* Add comments to create API docs

* Improve OCR comments

* Rename OCR and add comments

* Make sure previous python example works

* Make sure previous python example works

* Fix Rec model bug

* Fix Rec model bug

* Fix rec model bug

* Add SetTrtMaxBatchSize function for TensorRT

* Add SetTrtMaxBatchSize Pybind

* Add set_trt_max_batch_size python function

* Set TRT dynamic shape in PPOCR examples

* Set TRT dynamic shape in PPOCR examples

* Set TRT dynamic shape in PPOCR examples

* Fix PPOCRv2 python example

* Fix PPOCR dynamic input shape bug

* Remove useless code

* Fix PPOCR bug

* Remove useless comments  in PaddleSeg example

* Fix quantize docs readme

* Fix PP-OCRv2 readme

* Modify dynamic shape in PP-OCRv2 example

Co-authored-by: Jason <jiangjiajun@baidu.com>

examples/vision/ocr/PP-OCRv2/cpp/infer.cc

@@ -37,9 +37,9 @@ void InitAndInfer(const std::string& det_model_dir, const std::string& cls_model
   // We recommend that users set the length and height of the detection model to a multiple of 32.
   det_option.SetTrtInputShape("x", {1, 3, 64,64}, {1, 3, 640, 640},
                                 {1, 3, 960, 960});
-  cls_option.SetTrtInputShape("x", {1, 3, 48, 10}, {10, 3, 48, 320}, {64, 3, 48, 1024});
+  cls_option.SetTrtInputShape("x", {1, 3, 48, 10}, {10, 3, 48, 320}, {32, 3, 48, 1024});
   rec_option.SetTrtInputShape("x", {1, 3, 32, 10}, {10, 3, 32, 320},
-                                {64, 3, 32, 2304});
+                                {32, 3, 32, 2304});
 
   // Users could save TRT cache file to disk as follow. 
   // det_option.SetTrtCacheFile(det_model_dir + sep + "det_trt_cache.trt");