web_service.py

# Copyright (c) 2020 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.
from paddle_serving_server.web_service import WebService, Op
import logging
import numpy as np
import sys
import cv2
from paddle_serving_app.reader import *
import base64

class Yolov3Op(Op):
    def init_op(self):
        self.img_preprocess = Sequential([
            BGR2RGB(), Div(255.0),
            Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225], False),
            Resize((640, 640)), Transpose((2, 0, 1))
        ])
        self.img_postprocess = RCNNPostprocess("label_list.txt", "output")

    def preprocess(self, input_dicts, data_id, log_id):
        (_, input_dict), = input_dicts.items()
        imgs = []
        #print("keys", input_dict.keys())
        for key in input_dict.keys():
            data = base64.b64decode(input_dict[key].encode('utf8'))
            data = np.fromstring(data, np.uint8)
            im = cv2.imdecode(data, cv2.IMREAD_COLOR)
            im = self.img_preprocess(im)
            imgs.append({
              "image": im[np.newaxis,:],
              "im_shape": np.array(list(im.shape[1:])).reshape(-1)[np.newaxis,:],
              "scale_factor": np.array([1.0, 1.0]).reshape(-1)[np.newaxis,:],
            })
        feed_dict = {
            "image": np.concatenate([x["image"] for x in imgs], axis=0),
            "im_shape": np.concatenate([x["im_shape"] for x in imgs], axis=0),
            "scale_factor": np.concatenate([x["scale_factor"] for x in imgs], axis=0)
        }
        #for key in feed_dict.keys():
        #    print(key, feed_dict[key].shape)
        return feed_dict, False, None, ""

    def postprocess(self, input_dicts, fetch_dict, log_id):
        #print(fetch_dict)
        res_dict = {"bbox_result": str(self.img_postprocess(fetch_dict))}
        return res_dict, None, ""


class Yolov3Service(WebService):
    def get_pipeline_response(self, read_op):
        yolov3_op = Yolov3Op(name="yolov3", input_ops=[read_op])
        return yolov3_op


yolov3_service = Yolov3Service(name="yolov3")
yolov3_service.prepare_pipeline_config("config2.yml")
yolov3_service.run_service()