docs: Link to cluster info

[tara-det-ai]

How to access user data

Problem: it isn't clear what the interface is to access the values from inside the model code.

Users can call their own arbitrary user_data from the Experiment Configuration file. This would be things like data sources and containers or even credentials (which are obscurable). To do this, the user uses data (not metadata.data) in the Experiment configuration yaml file. Which is documented here. However, it is not clear how Determined accesses the values of this user data from inside the model code.

Solution:
Help users understand that the way to access the data:
https://docs.determined.ai/latest/reference/experiment-config-reference.html#data ...

is here
https://docs.determined.ai/latest/reference/training/api-det-reference.html#determined.ClusterInfo.user_data

another way
another way is just the xpath, for example, under the "username" section we could have task_container_defaults.registry_auth.username

there are 3 ways to retrieve data config and one way to get all of it:

From DET_EXPERIMENT_CONFIG env var like:
expconf = os.environ.get("DET_EXPERIMENT_CONFIG")

• You can then json.loads(expconf) and handle it like json

From context

• data_config = train_context.get_data_config()

From cluster_info

• data = det.get_cluster_info().user_data

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