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Make model link come from PaddleOCR (#350)
* 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 Co-authored-by: Jason <jiangjiajun@baidu.com>
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yunyaoXYY
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根据不同场景, FastDeploy汇总提供如下OCR任务部署, 用户需同时下载3个模型与字典文件（或2个，分类器可选), 完成OCR整个预测流程
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### OCR 中英文系列模型
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### PP-OCR 中英文系列模型
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下表中的模型下载链接由PaddleOCR模型库提供, 详见[PP-OCR系列模型列表](https://github.com/PaddlePaddle/PaddleOCR/blob/release/2.6/doc/doc_ch/models_list.md)
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| OCR版本 | 文本框检测 | 方向分类模型 | 文字识别 |字典文件| 说明 |
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|:----|:----|:----|:----|:----|:--------|
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| ch_PP-OCRv3[推荐] |[ch_PP-OCRv3_det](https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_cls_infer.tar.gz) | [ch_PP-OCRv3_rec](https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_rec_infer.tar) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv3系列原始超轻量模型，支持中英文、多语种文本检测 |
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| en_PP-OCRv3[推荐] |[en_PP-OCRv3_det](https://bj.bcebos.com/paddlehub/fastdeploy/en_PP-OCRv3_det_infer.tar.gz) | [ch_ppocr_mobile_v2.0_cls](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_cls_infer.tar.gz) | [en_PP-OCRv3_rec](https://paddleocr.bj.bcebos.com/PP-OCRv3/english/en_PP-OCRv3_rec_infer.tar) | [en_dict.txt](https://bj.bcebos.com/paddlehub/fastdeploy/en_dict.txt) | OCRv3系列原始超轻量模型，支持英文与数字识别，除检测模型和识别模型的训练数据与中文模型不同以外，无其他区别 |
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| ch_PP-OCRv2 |[ch_PP-OCRv2_det](https://bj.bcebos.com/paddlehub/fastdeploy/ch_PP-OCRv2_det_infer.tar.gz) | [ch_ppocr_mobile_v2.0_cls](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_cls_infer.tar.gz) | [ch_PP-OCRv2_rec](https://bj.bcebos.com/paddlehub/fastdeploy/ch_PP-OCRv2_rec_infer.tar.gz) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2系列原始超轻量模型，支持中英文、多语种文本检测 |
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| ch_PP-OCRv2_mobile |[ch_ppocr_mobile_v2.0_det](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_det_infer.tar.gz) | [ch_ppocr_mobile_v2.0_cls](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_cls_infer.tar.gz) | [ch_ppocr_mobile_v2.0_rec](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_rec_infer.tar.gz) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2系列原始超轻量模型，支持中英文、多语种文本检测,比PPOCRv2更加轻量 |
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| ch_PP-OCRv2_server |[ch_ppocr_server_v2.0_det](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_server_v2.0_det_infer.tar.gz) | [ch_ppocr_mobile_v2.0_cls](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_mobile_v2.0_cls_infer.tar.gz) | [ch_ppocr_server_v2.0_rec](https://bj.bcebos.com/paddlehub/fastdeploy/ch_ppocr_server_v2.0_rec_infer.tar.gz) |[ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2服务器系列模型, 支持中英文、多语种文本检测，比超轻量模型更大，但效果更好|
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### OCR 模型的处理说明
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为了让OCR系列模型在FastDeploy多个推理后端上正确推理，以上表格中的部分模型的输入shape，和PaddleOCR套件提供的模型有差异.
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例如，由PaddleOCR套件库提供的英文版PP-OCRv3_det模型,输入的shape是`[-1,3,960,960]`, 而FastDeploy提供的此模型输入shape为`[-1,3,-1,-1]`.
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**差异存在的原因**: 当我们在ORT和OpenVINO上部署输入shape固定的模型时(指定了高和宽),由于OCR的输入图片尺寸是变化的，会报例如下面所示的错误，导致无法推理:
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```
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Failed to Infer: Got invalid dimensions for input: x for the following indices
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index: 3 Got: 608 Expected: 960
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```
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**解决办法**:除了直接下载FastDeploy提供的模型外，用户还可以使用如下工具仓库, 修改模型的输入shape.
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**仓库链接**: https://github.com/jiangjiajun/PaddleUtils
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使用示例如下：
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```
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#该用例将en_PP-OCRv3_det_infer模型的输入shape, 改为[-1,3,-1,-1], 并将新模型存放至output文件夹下
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git clone git@github.com:jiangjiajun/PaddleUtils.git
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cd paddle
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python paddle_infer_shape.py --model_dir en_PP-OCRv3_det_infer/ \
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--model_filename inference.pdmodel \
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--params_filename inference.pdiparams \
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--save_dir output \
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--input_shape_dict="{'x':[-1,3,-1,-1]}"
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```
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#### OCR模型输入shape更改记录
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以下表格记录了FastDeploy修改过的OCR模型的输入`('输入名':[shape])`, 供用户参考.
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| OCR版本 | 模型 | 修改前 | 修改后 |
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|:----|:----|:----|:----|
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|PPOCRv3 |en_PP-OCRv3_det|'x':[-1,3,960,960]|'x':[-1,3,-1,-1]|
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|PPOCRv2 |ch_PP-OCRv2_det|'x':[-1,3,960,960]|'x':[-1,3,-1,-1]|
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|PPOCRv2 |ch_PP-OCRv2_rec|'x':[-1,3,32,100]|'x':[-1,3,-1,-1]|
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|PPOCRv2_mobile |ch_ppocr_mobile_v2.0_det|'x':[-1,3,640,640]|'x':[-1,3,-1,-1]|
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|PPOCRv2_mobile|ch_ppocr_mobile_v2.0_rec|'x':[-1,3,32,100]|'x':[-1,3,-1,-1]|
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|PPOCRv2_server|ch_ppocr_server_v2.0_det|'x':[-1,3,640,640]|'x':[-1,3,-1,-1]|
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|PPOCRv2_server |ch_ppocr_server_v2.0_rec|'x':[-1,3,32,100]|'x':[-1,3,-1,-1]|
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| ch_PP-OCRv3[推荐] |[ch_PP-OCRv3_det](https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar) | [ch_PP-OCRv3_rec](https://paddleocr.bj.bcebos.com/PP-OCRv3/chinese/ch_PP-OCRv3_rec_infer.tar) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv3系列原始超轻量模型，支持中英文、多语种文本检测 |
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| en_PP-OCRv3[推荐] |[en_PP-OCRv3_det](https://paddleocr.bj.bcebos.com/PP-OCRv3/english/en_PP-OCRv3_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar) | [en_PP-OCRv3_rec](https://paddleocr.bj.bcebos.com/PP-OCRv3/english/en_PP-OCRv3_rec_infer.tar) | [en_dict.txt](https://bj.bcebos.com/paddlehub/fastdeploy/en_dict.txt) | OCRv3系列原始超轻量模型，支持英文与数字识别，除检测模型和识别模型的训练数据与中文模型不同以外，无其他区别 |
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| ch_PP-OCRv2 |[ch_PP-OCRv2_det](https://paddleocr.bj.bcebos.com/PP-OCRv2/chinese/ch_PP-OCRv2_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar) | [ch_PP-OCRv2_rec](https://paddleocr.bj.bcebos.com/PP-OCRv2/chinese/ch_PP-OCRv2_rec_infer.tar) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2系列原始超轻量模型，支持中英文、多语种文本检测 |
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| ch_PP-OCRv2_mobile |[ch_ppocr_mobile_v2.0_det](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar) | [ch_ppocr_mobile_v2.0_rec](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_rec_infer.tar) | [ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2系列原始超轻量模型，支持中英文、多语种文本检测,比PPOCRv2更加轻量 |
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| ch_PP-OCRv2_server |[ch_ppocr_server_v2.0_det](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_server_v2.0_det_infer.tar) | [ch_ppocr_mobile_v2.0_cls](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_mobile_v2.0_cls_infer.tar) | [ch_ppocr_server_v2.0_rec](https://paddleocr.bj.bcebos.com/dygraph_v2.0/ch/ch_ppocr_server_v2.0_rec_infer.tar) |[ppocr_keys_v1.txt](https://bj.bcebos.com/paddlehub/fastdeploy/ppocr_keys_v1.txt) | OCRv2服务器系列模型, 支持中英文、多语种文本检测，比超轻量模型更大，但效果更好|
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