Classifier.py

# -*- coding: utf-8 -*-
"""
分类器示例
"""

import cv2
import numpy as np
import migraphx

def Preprocessing(pathOfImage):
    # 读取图像
    image = cv2.imread(pathOfImage, cv2.IMREAD_COLOR)             
    image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
    
    # 调整大小，使短边为256，保持长宽比
    ratio = float(256) / min(image.shape[0], image.shape[1])
    if image.shape[0] > image.shape[1]:
        new_size = [int(round(ratio * image.shape[0])), 256]
    else:
        new_size = [256, int(round(ratio * image.shape[1]))]
    image = np.array(cv2.resize(image, (new_size[1],new_size[0])))
    
    # 裁剪中心窗口为224*224
    h, w, c = image.shape
    start_x = w//2 - 224//2
    start_y = h//2 - 224//2
    image = image[start_y:start_y+224, start_x:start_x+224, :]
    
    # transpose
    image = image.transpose(2, 0, 1)
    
    # 将输入数据转换为float32
    img_data = image.astype('float32')
    
    # normalize
    mean_vec = np.array([123.675, 116.28, 103.53])
    stddev_vec = np.array([58.395, 57.12, 57.375])
    norm_img_data = np.zeros(img_data.shape).astype('float32')
    for i in range(img_data.shape[0]):
        norm_img_data[i,:,:] = (img_data[i,:,:] - mean_vec[i]) / stddev_vec[i]
    
    # 调整尺寸
    norm_img_data = norm_img_data.reshape(1, 3, 224, 224).astype('float32')
    return norm_img_data

if __name__ == '__main__':
    # 加载模型
    model = migraphx.parse_onnx("../Resource/Models/resnet50-v2-7.onnx")
    inputName=model.get_parameter_names()[0]
    inputShape=model.get_parameter_shapes()[inputName].lens()
    print("inputName:{0} \ninputShape:{1}".format(inputName,inputShape))

    # 编译
    model.compile(t=migraphx.get_target("gpu"),device_id=0) # device_id: 设置GPU设备，默认为0号设备

    # 预处理并转换为NCHW
    pathOfImage ="../Resource/Images/ImageNet_01.jpg"
    image = Preprocessing(pathOfImage)

    # 推理
    results = model.run({inputName: image}) # 推理结果，list类型

    # 获取输出节点属性
    result=results[0] # 获取第一个输出节点的数据,migraphx.argument类型
    outputShape=result.get_shape() # 输出节点的shape,migraphx.shape类型
    outputSize=outputShape.lens() # 每一维大小，维度顺序为(N,C,H,W),list类型
    numberOfOutput=outputShape.elements() # 输出节点元素的个数

    # 获取分类结果
    result=np.array(results[0])

    print(result)