[BLVCK-MAMBA-6]

Reference Issues/PRs

Refs #2474. Stacked on #2434.

What does this implement/fix? Explain your changes.

Updates the extension templates to match the v2 forecaster API:

• Replaces the model-package template with a BaseForecaster template.
• Updates model linkage and adds support for data-derived metadata.
• Uses BaseTimeSeriesDataModule hooks and inherits its constructor to preserve configuration when attaching data.
• Updates dataset signatures and documents the metric prediction-tensor contract.
• Updates the extension README.

This covers only the extension-template subtask of #2474.

What should a reviewer concentrate their feedback on?

Whether the templates correctly demonstrate the model, forecaster, and datamodule interfaces introduced in #2434.

The template changes are contained in commit 8aad6a2. The broader diff against v2-dev includes changes inherited from #2434.

Did you add any tests for the change?

No new automated tests were added.

The following checks passed for the changed templates:

• Ruff lint and formatting.
• Python compilation.
• Staged diff whitespace checks.

The runtime configuration-cloning check was blocked during package import by ModuleNotFoundError: No module named 'sklearn', so runtime behavior remains unverified.

Any other comments?

This PR depends on #2434 and should merge after it.

The model and data-processing methods remain intentional fill-in placeholders.

PR checklist

• The PR title starts with [DOC].
• Added/modified tests.
• Used the full pre-commit hook suite.

[phoeenniixx]

Thanks!
Can you please not remove the docstrings and todos instead update them, please follow the exisiting pattern and update the template based on it

[codecov]

Codecov Report

❌ Patch coverage is 95.04021% with 37 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v2-dev@4c9d6bd). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...ytorch_forecasting/models/base/_base_forecaster.py	78.97%	37 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             v2-dev    #2484   +/-   ##
=========================================
  Coverage          ?   88.41%           
=========================================
  Files             ?      202           
  Lines             ?    11683           
  Branches          ?        0           
=========================================
  Hits              ?    10329           
  Misses            ?     1354           
  Partials          ?        0           

Flag	Coverage Δ
cpu	88.41% <95.04%> (?)
pytest	88.41% <95.04%> (?)

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[BLVCK-MAMBA-6]

Thanks! Can you please not remove the docstrings and todos instead update them, please follow the exisiting pattern and update the template based on it

Hi @phoeenniixx, I’ve restored the docstrings and TODOs and updated them for the new API, following the existing template pattern.

Please take another look whenever you're chanced. Thank you.