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Generate model archiver files for torchserve


  1. Your ~/.kube/config should point to a cluster with KServe installed.
  2. Your cluster's Istio Ingress gateway must be network accessible.

1. Create PV and PVC

Create a Persistent volume and volume claim. This document uses amazonEBS PV. For AWS EFS storage you can refer to AWS EFS storage

1.1 Create PV

Edit volume id in pv.yaml file

kubectl apply -f pv.yaml

Expected Output

persistentvolume/model-pv-volume created

1.2 Create PVC

kubectl apply -f pvc.yaml

Expected Output

persistentvolumeclaim/model-pv-claim created

2 Create model store files layout and copy to PV

We create a pod with the PV attached to copy the model files and for generating model archive file.

2.1 Create pod for copying model store files to PV

kubectl apply -f pvpod.yaml

Expected Output

pod/model-store-pod created

2.2 Create model store file layout on PV

2.2.1 Create properties.json file

This file has model-name, version, model-file name, serialized-file name, extra-files, handlers, workers etc. of the models.

    "model-name": "mnist",
    "version": "1.0",
    "model-file": "",
    "serialized-file": "",
    "extra-files": "",
    "handler": "",
    "min-workers" : 1,
    "max-workers": 3,
    "batch-size": 1,
    "max-batch-delay": 100,
    "response-timeout": 120,
    "requirements": ""
    "model-name": "densenet_161",
    "version": "1.0",
    "model-file": "",
    "serialized-file": "densenet161-8d451a50.pth",
    "extra-files": "index_to_name.json",
    "handler": "image_classifier",
    "min-workers" : 1,
    "max-workers": 3,
    "batch-size": 1,
    "max-batch-delay": 100,
    "response-timeout": 120,
    "requirements": ""

2.2.2 Copy model and its dependent Files

Copy all the model and dependent files to the PV in the structure given below. An empty config folder, a model-store folder containing model name as folder name. Within that model folder, the files required to build the marfile.

├── config
├── model-store
│   ├── densenet_161
│   │   ├── densenet161-8d451a50.pth
│   │   ├── index_to_name.json
│   │   └──
│   ├── mnist
│   │   ├──
│   │   ├──
│   │   └──
│   └── properties.json

2.2.3 Create folders for model-store and config in PV

kubectl exec -it model-store-pod -c model-store -n kserve-test -- mkdir /pv/model-store/

kubectl exec -it model-store-pod -c model-store -n kserve-test -- mkdir /pv/config/

2.3 Copy model files and to the PV

kubectl cp model-store/* model-store-pod:/pv/model-store/ -c model-store -n kserve-test
kubectl cp model-store-pod:/pv/config/ -c model-store -n kserve-test

2.4 Delete pv pod

Since amazon EBS provide only ReadWriteOnce mode, we have to unbind the PV for use of model archiver.

kubectl delete pod model-store-pod -n kserve-test

3 Generate model archive file and server configuration file

3.1 Create model archive pod and run model archive file generation script

kubectl apply -f model-archiver.yaml -n kserve-test

3.2 Check the output and delete model archive pod

Verify mar files and

kubectl exec -it margen-pod -n kserve-test -- ls -lR /home/model-server/model-store
kubectl exec -it margen-pod -n kserve-test -- cat /home/model-server/config/

3.3 Delete model archiver

kubectl delete -f model-archiver.yaml -n kserve-test
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