sedna

Using Incremental Learning Job in Helmet Detection Scenario

This document introduces how to use incremental learning job in helmet detection scenario. Using the incremental learning job, our application can automatically retrains, evaluates, and updates models based on the data generated at the edge.

Helmet Detection Experiment

Install Sedna

Follow the Sedna installation document to install Sedna.

Prepare Model

In this example, we need to prepare base model and deploy model in advance. download models, including base model and deploy model.

cd /
wget https://kubeedge.obs.cn-north-1.myhuaweicloud.com/examples/helmet-detection/models.tar.gz
tar -zxvf models.tar.gz

Prepare for Inference Worker

In this example, we simulate a inference worker for helmet detection, the worker will upload hard examples to HE_SAVED_URL, while it inferences data from local video. We need to make following preparations:

make sure following localdirs exist

mkdir -p /incremental_learning/video/
mkdir -p /incremental_learning/he/
mkdir -p /data/helmet_detection
mkdir /output

download video, unzip video.tar.gz, and put it into /incremental_learning/video/

cd /incremental_learning/video/
wget https://kubeedge.obs.cn-north-1.myhuaweicloud.com/examples/helmet-detection/video.tar.gz
tar -zxvf video.tar.gz

Prepare Image

This example uses the image:

kubeedge/sedna-example-incremental-learning-helmet-detection:v0.4.0

This image is generated by the script build_images.sh, used for creating training, eval and inference worker.

Create Incremental Job

In this example, $WORKER_NODE is a custom node, you can fill it which you actually run.

WORKER_NODE="edge-node"

Create Dataset

kubectl create -f - <<EOF
apiVersion: sedna.io/v1alpha1
kind: Dataset
metadata:
  name: incremental-dataset
spec:
  url: "/data/helmet_detection/train_data/train_data.txt"
  format: "txt"
  nodeName: $WORKER_NODE
EOF

Create Initial Model to simulate the initial model in incremental learning scenario.

kubectl create -f - <<EOF
apiVersion: sedna.io/v1alpha1
kind: Model
metadata:
  name: initial-model
spec:
  url : "/models/base_model"
  format: "ckpt"
EOF

Create Deploy Model

kubectl create -f - <<EOF
apiVersion: sedna.io/v1alpha1
kind: Model
metadata:
  name: deploy-model
spec:
  url : "/models/deploy_model/saved_model.pb"
  format: "pb"
EOF

Start The Incremental Learning Job

incremental learning supports hot model updates and cold model updates. Job support cold model updates default. If you want to use hot model updates, please to add the following fields:

deploySpec:
  model:
    hotUpdateEnabled: true
    pollPeriodSeconds: 60  # default value is 60

create the job:

IMAGE=kubeedge/sedna-example-incremental-learning-helmet-detection:v0.4.0

kubectl create -f - <<EOF
apiVersion: sedna.io/v1alpha1
kind: IncrementalLearningJob
metadata:
  name: helmet-detection-demo
spec:
  initialModel:
    name: "initial-model"
  dataset:
    name: "incremental-dataset"
    trainProb: 0.8
  trainSpec:
    template:
      spec:
        nodeName: $WORKER_NODE
        containers:
          - image: $IMAGE
            name:  train-worker
            imagePullPolicy: IfNotPresent
            args: ["train.py"]
            env:
              - name: "batch_size"
                value: "32"
              - name: "epochs"
                value: "1"
              - name: "input_shape"
                value: "352,640"
              - name: "class_names"
                value: "person,helmet,helmet-on,helmet-off"
              - name: "nms_threshold"
                value: "0.4"
              - name: "obj_threshold"
                value: "0.3"
    trigger:
      checkPeriodSeconds: 60
      timer:
        start: 02:00
        end: 20:00
      condition:
        operator: ">"
        threshold: 500
        metric: num_of_samples
  evalSpec:
    template:
      spec:
        nodeName: $WORKER_NODE
        containers:
          - image: $IMAGE
            name:  eval-worker
            imagePullPolicy: IfNotPresent
            args: ["eval.py"]
            env:
              - name: "input_shape"
                value: "352,640"
              - name: "class_names"
                value: "person,helmet,helmet-on,helmet-off"                    
  deploySpec:
    model:
      name: "deploy-model"
      hotUpdateEnabled: true
      pollPeriodSeconds: 60 
    trigger:
      condition:
        operator: ">"
        threshold: 0.1
        metric: precision_delta
    hardExampleMining:
      name: "IBT"
      parameters:
        - key: "threshold_img"
          value: "0.9"
        - key: "threshold_box"
          value: "0.9"
    template:
      spec:
        nodeName: $WORKER_NODE
        containers:
        - image: $IMAGE
          name:  infer-worker
          imagePullPolicy: IfNotPresent
          args: ["inference.py"]
          env:
            - name: "input_shape"
              value: "352,640"
            - name: "video_url"
              value: "file://video/video.mp4"
            - name: "HE_SAVED_URL" 
              value: "/he_saved_url"
          volumeMounts:
          - name: localvideo
            mountPath: /video/
          - name: hedir
            mountPath: /he_saved_url
          resources:  # user defined resources
            limits:
              memory: 2Gi
        volumes:   # user defined volumes
          - name: localvideo
            hostPath:
              path: /incremental_learning/video/
              type: DirectoryOrCreate
          - name: hedir
            hostPath:
              path:  /incremental_learning/he/
              type: DirectoryOrCreate
  outputDir: "/output"
EOF

The Dataset describes data with labels and HE_SAVED_URL indicates the address of the deploy container for uploading hard examples. Users will mark label for the hard examples in the address.
Ensure that the path of outputDir in the YAML file exists on your node. This path will be directly mounted to the container.

Check Incremental Learning Job

Query the service status:

kubectl get incrementallearningjob helmet-detection-demo

In the IncrementalLearningJob resource helmet-detection-demo, the following trigger is configured:

trigger:
  checkPeriodSeconds: 60
  timer:
    start: 02:00
    end: 20:00
  condition:
    operator: ">"
    threshold: 500
    metric: num_of_samples

Hard Example Labeling

In a real word, we need to label the hard examples in HE_SAVED_URL with annotation tools and then put the examples to Dataset’s url.

You can use Open-Source annotation tools to label hard examples, such as MAKE SENSE, which has following main advantages:

Open source and free to use under GPLv3 license
Support outputfile formats like YOLO, VOC XML, VGG JSON, CSV
No advanced installation required, just open up your browser
Use AI to make your work more productive
Offline running as a container, ensuring data security

the details labeling are not described here, main steps in this demo are as follows:

import unlabeled hard example to anonotation tools
label and export annotations
you will get YOLO format annotations, so you need convert them to the type which can be used by your own training code. in this example, the following scripts are provided for reference:

import os

annotation_dir_path = "C:/Users/Administrator/Desktop/labeled_data"
save_path = "C:/Users/Administrator/Desktop/labeled_data/save_label.txt"

def convert_single_line(line):
    line_list = []
    line = line.split(" ")
    for i in range(1, len(line)):
        line[i] = float(line[i])
        line[i] = line[i] * 1000
        line_list.append(str(int(line[i])))
    line_list.append(line[0])
    return ",".join(line_list)

if __name__ == '__main__':
    results = []
    g = os.walk(annotation_dir_path)
    for path, dir_list, file_list in g:
        for file_name in file_list:
            file_path = os.path.join(path, file_name)
            file_name = file_name.split("txt")
            file_name = file_name[0] + 'jpg'
            single_label_string = file_name
            f = open(file_path)
            lines = f.readlines()
            for line in lines:
                line = line.strip('\n')
                single_label_string = single_label_string + " " + convert_single_line(line)
            results.append(single_label_string)
    save_file = open(save_path, "w")
    for result in results:
        save_file.write(result + "\n")
    save_file.close()

How to use:
annotation_dir_path: location for labeled annotations from MAKESENSE
save_path: location for label txt which converted from annotations

run above script, you can get a txt which includes all label information
put the text with examples in the same dir
you will get labeled examples which meet training requirements
put these examples and annotations above to Dataset’s url

Without annotation tools, we can simulate the condition of num_of_samples in the following ways:
Download dataset to $WORKER_NODE.

cd /data/helmet_detection
wget  https://kubeedge.obs.cn-north-1.myhuaweicloud.com/examples/helmet-detection/dataset.tar.gz
tar -zxvf dataset.tar.gz

The LocalController component will check the number of the sample, realize trigger conditions are met and notice the GlobalManager Component to start train worker. When the train worker finish, we can view the updated model in the /output directory in $WORKER_NODE node. Then the eval worker will start to evaluate the model that train worker generated.

If the eval result satisfy the deploySpec’s trigger

trigger:
  condition:
    operator: ">"
    threshold: 0.1
    metric: precision_delta

the deploy worker will load the new model and provide service.

Effect Display

In this example, false and failed detections occur at stage of inference before incremental learning, after incremental learning, all targets are correctly detected.

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