import paddle.inference as paddle_infer
import numpy as np
import paddle.vision.transforms as T

class Lane_model_infer:
    def __init__(self, model_dir="./lane_model"):
        # 初始化paddle推理
        self.model_dir = model_dir
        self.config = paddle_infer.Config(model_dir + "/model.pdmodel", model_dir + "/model.pdiparams")
        self.config.enable_use_gpu(200, 0)
        self.predictor = paddle_infer.create_predictor(self.config)
        self.input_names = self.predictor.get_input_names()
        self.input_handle = self.predictor.get_input_handle(self.input_names[0])
        self.output_names = self.predictor.get_output_names()
        self.output_handle = self.predictor.get_output_handle(self.output_names[0])
        self.normalize_transform = T.Normalize(mean=[127.5], std=[127.5])
    
    def infer(self,src) -> np.ndarray:
        image = self.normalize_transform(src)
        image = image.transpose(2, 0, 1)
        image = np.expand_dims(image, axis=0)
        self.input_handle.copy_from_cpu(image)
        self.predictor.run()
        results = self.output_handle.copy_to_cpu()[0]
        return results