[Model] add style transfer model (#922)

* add style transfer model

* add examples for generation model

* add unit test

* add speed comparison

* add speed comparison

* add variable for constant

* add preprocessor and postprocessor

* add preprocessor and postprocessor

* fix

* fix according to review

Co-authored-by: DefTruth <31974251+DefTruth@users.noreply.github.com>

fastdeploy/vision/generation/contrib/preprocessor.h

@@ -0,0 +1,42 @@
+// 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.
+
+#pragma once
+#include "fastdeploy/vision/common/processors/transform.h"
+#include "fastdeploy/function/functions.h"
+
+namespace fastdeploy {
+namespace vision {
+
+namespace generation {
+/*! @brief Preprocessor object for AnimeGAN serials model.
+ */
+class FASTDEPLOY_DECL AnimeGANPreprocessor {
+ public:
+  /** \brief Create a preprocessor instance for AnimeGAN serials model
+   */
+  AnimeGANPreprocessor() {}
+
+  /** \brief Process the input image and prepare input tensors for runtime
+   *
+   * \param[in] images The input image data list, all the elements are returned wrapped by FDMat.
+   * \param[in] output The output tensors which will feed in runtime
+   * \return true if the preprocess successed, otherwise false
+   */
+  bool Run(std::vector<Mat>& images, std::vector<FDTensor>* output);
+};
+
+}  // namespace generation
+}  // namespace vision
+}  // namespace fastdeploy