MLFLOW MR & HuggingFace & KFMR logical model comparison

[mzhl1111]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like
finalize the design for schema of middle layer that transform outer MR logical model to KFMR
MLFlow ref

Schema	KFMR	MLFlow	Existed Huggingface integratoin
Registered Model	Git repo, CR repo/name, Hugging Face Repo, Name String	Name string + (mlflow artifact)version can offer a run id (can be seen as a repo inside mlflow)	Hugging Face repo
Model Version	A git tag, A container image tag, string represent	user input	user input
Model Artifact	ONIX, pickle, .ckpt file	download by API(pass the URL)	down load with API
Doc Artifact	A README.md file	If exists as an artifact of the same run, can be downloaded	If exists in the repo, can be downloaded

Discussion needed

• Mlflow has multiple flavors and when storing artifacts it automatically generates a folder that includes:
  1. files for environment setup, including requirements.txt, pythonvenv.yaml and conda.yaml. Do we need this type of data for Kserve?
  2. MLmodel file that stores model metadata including the schema that can convert to model_format, model_format_version, do we grab these inform from the artifact or keep it as required user-input
     for example:
  3. The model meta data can be retrieved using :

model_version_details = client.get_model_version(name='some_model_name', version=int(some_ver))
model = mlflow.pyfunc.load_model(model_version_details.source)
model.metadata.flavors['some_flavor'] # there are 2 keys for flavors use the one other than "python_function"}

Note: the structure inside the map can be different

• assessment of mapping table of "MLFlow flavour" compared to "Kserve model format"

  1. There is no documation about what if a "flavour" is supported by the Mlflow Model Registry, it is focused on if a specific version of this "flavour" is compatible with auto_logging.

• Accessibility of Mlflow download link for downstream usages of the URI (ex, this format "mlflow-artifacts:/0/ebbbb937c23449d695f8146c4a8241ff/artifacts/sklearn-model")

  1. Not possible to directly use the so called atrifact_uri that mlflow offers Reason
  2. new finding that can try https://stackoverflow.com/a/71688558
  3. If we assume the user sets default-artifact-root to public storage like s3

mlflow server \
  --backend-store-uri postgresql://user:password@localhost:5432/mlflowdb \
  --artifacts-destination s3://bucket \
  --host 0.0.0.0 \
  --port 5000 

The download URL is can be get directly

[mzhl1111]

/assign @mzhl1111

[mzhl1111]

draft version "mzhl1111@abd4242"

updated (unit test added)
mzhl1111@a5a2edd

[mzhl1111]

To track the model artifact from mlflow, we need to follow the following steps

get the "Source" URL in mlflow

This can be done directly via the mlflow Api (Green), but lead us only to the parent directory of the model artifact(gray). The image is an example of a registered model with Pytorch format.

what we want is the file in the blue file, thus we need the metadata

To locate the model artifact we need to contact the source URL and the filename we get from the metadata.

Issue we have.

Different model format/flavor have different info-storing structures of the metadata.

The following is sklearn format, and it uses different keys in metadata to store the filename of the model artifact

model artifact name in metadata may change

I found the touch model artifact changed from pickled_model.pth to model.pth, but now this is hard-coded in our code, because we can only get '/data' from metadata and concat with source URL.

If we use the mlflow Runtime as the downstream format for Kserve to use, which they support, we do not need to do these hard coding parts to get an absolute directory of the model artifact.

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