[Other] Add Model Clone function for PaddleClas && PaddleDet && PaddleSeg (#791)

* Refactor PaddleSeg with preprocessor && postprocessor

* Fix bugs

* Delete redundancy code

* Modify by comments

* Refactor according to comments

* Add batch evaluation

* Add single test script

* Add ppliteseg single test script && fix eval(raise) error

* fix bug

* Fix evaluation segmentation.py batch predict

* Fix segmentation evaluation bug

* Fix evaluation segmentation bugs

* Update segmentation result docs

* Update old predict api and DisableNormalizeAndPermute

* Update resize segmentation label map with cv::INTER_NEAREST

* Add Model Clone function for PaddleClas && PaddleDet && PaddleSeg

* Add multi thread demo

* Add python model clone function

* Add multi thread python && C++ example

* Fix bug

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

python/fastdeploy/vision/classification/ppcls/__init__.py

@@ -85,6 +85,19 @@ class PaddleClasModel(FastDeployModel):
             model_format)
         assert self.initialized, "PaddleClas model initialize failed."
 
+    def clone(self):
+        """Clone PaddleClasModel object
+
+        :return: a new PaddleClasModel object
+        """
+
+        class PaddleClasCloneModel(PaddleClasModel):
+            def __init__(self, model):
+                self._model = model
+
+        clone_model = PaddleClasCloneModel(self._model.clone())
+        return clone_model
+
     def predict(self, im, topk=1):
         """Classify an input image