[Backend And DOC] 改进ppseg文档 + 为RKNPU2后端新增对多输入模型的支持 (#491)

* 11-02/14:35
* 新增输入数据format错误判断
* 优化推理过程，减少内存分配次数
* 支持多输入rknn模型
* rknn模型输出shape为三维时，输出将被强制对齐为4纬。现在将直接抹除rknn补充的shape，方便部分对输出shape进行判断的模型进行正确的后处理。

* 11-03/17:25
* 支持导出多输入RKNN模型
* 更新各种文档
* ppseg改用Fastdeploy中的模型进行转换

* 11-03/17:25
* 新增开源头

* 11-03/21:48
* 删除无用debug代码，补充注释

examples/vision/segmentation/paddleseg/rknpu2/python/infer.py

@@ -1,3 +1,16 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 import fastdeploy as fd
 import cv2
 import os
@@ -30,7 +43,11 @@ model_file = args.model_file
 params_file = ""
 config_file = args.config_file
 model = fd.vision.segmentation.PaddleSegModel(
-    model_file, params_file, config_file, runtime_option=runtime_option,model_format=fd.ModelFormat.RKNN)
+    model_file,
+    params_file,
+    config_file,
+    runtime_option=runtime_option,
+    model_format=fd.ModelFormat.RKNN)
 
 model.disable_normalize_and_permute()