我已经将我的目标检测模型部署到了Google Kubernetes Engine上。我的模型是使用faster_rcnn_resnet101_pets配置进行训练的。尽管在我的集群节点中使用了Nvidia Tesla K80 GPU,但我的模型推理时间非常长(预测的总时间约为10秒)。我正在使用gRPC从模型获取预测结果。用于进行预测请求的脚本如下:
import argparse
import os
import time
import sys
import tensorflow as tf
from PIL import Image
import numpy as np
from grpc.beta import implementations
sys.path.append("..")
from object_detection.core.standard_fields import \
DetectionResultFields as dt_fields
from object_detection.utils import label_map_util
from argparse import RawTextHelpFormatter
from tensorflow_serving.apis import predict_pb2
from tensorflow_serving.apis import prediction_service_pb2_grpc
tf.logging.set_verbosity(tf.logging.INFO)
WIDTH = 1024
HEIGHT = 768
def load_image_into_numpy_array(input_image):
image = Image.open(input_image)
image = image.resize((WIDTH, HEIGHT), Image.ANTIALIAS)
(im_width, im_height) = image.size
image_arr = np.array(image.getdata()).reshape(
(im_height, im_width, 3)).astype(np.uint8)
image.close()
return image_arr
def load_input_tensor(input_image):
image_np = load_image_into_numpy_array(input_image)
image_np_expanded = np.expand_dims(image_np, axis=0).astype(np.uint8)
tensor = tf.contrib.util.make_tensor_proto(image_np_expanded)
return tensor
def main(args):
start_main = time.time()
host, port = args.server.split(':')
channel = implementations.insecure_channel(host, int(port))._channel
stub = prediction_service_pb2_grpc.PredictionServiceStub(channel)
request = predict_pb2.PredictRequest()
request.model_spec.name = args.model_name
input_tensor = load_input_tensor(args.input_image)
request.inputs['inputs'].CopyFrom(input_tensor)
start = time.time()
result = stub.Predict(request, 60.0)
end = time.time()
output_dict = {}
output_dict[dt_fields.detection_classes] = np.squeeze(
result.outputs[dt_fields.detection_classes].float_val).astype(np.uint8)
output_dict[dt_fields.detection_boxes] = np.reshape(
result.outputs[dt_fields.detection_boxes].float_val, (-1, 4))
output_dict[dt_fields.detection_scores] = np.squeeze(
result.outputs[dt_fields.detection_scores].float_val)
category_index = label_map_util.create_category_index_from_labelmap(args.label_map,
use_display_name=True)
classes = output_dict[dt_fields.detection_classes]
scores = output_dict[dt_fields.detection_scores]
classes.shape = (1, 300)
scores.shape = (1, 300)
print("prediction time : " + str(end-start))
objects = []
threshold = 0.5 # in order to get higher percentages you need to lower this number; usually at 0.01 you get 100% predicted objects
for index, value in enumerate(classes[0]):
object_dict = {}
if scores[0, index] > threshold:
object_dict[(category_index.get(value)).get('name').encode('utf8')] = \
scores[0, index]
objects.append(object_dict)
print(objects)
end_main = time.time()
print("Overall Time : " + str(end_main-start_main))
if __name__ == '__main__':
parser = argparse.ArgumentParser(description="Object detection grpc client.",
formatter_class=RawTextHelpFormatter)
parser.add_argument('--server',
type=str,
default='localhost:9000',
help='PredictionService host:port')
parser.add_argument('--model_name',
type=str,
default="my-model",
help='Name of the model')
parser.add_argument('--input_image',
type=str,
default='./test_images/123.jpg',
help='Path to input image')
parser.add_argument('--output_directory',
type=str,
default='./',
help='Path to output directory')
parser.add_argument('--label_map',
type=str,
default="./data/object_detection.pbtxt",
help='Path to label map file')
args = parser.parse_args()
main(args)
我已经使用kubectl端口转发进行测试,所以请求端口设置为localhost:9000。
输出如下:
prediction time : 6.690936326980591
[{b'goi_logo': 0.9999970197677612}]
Overall Time : 10.25893259048462
我该怎么做才能让我的推理变得更快? 我注意到推理时间是以毫秒为单位的,因此相比之下10秒是非常长的时间,不适合生产环境。 我知道端口转发很慢。 我还可以使用什么方法? 我需要将此客户端作为API端点提供给全世界。