sktime/sktime

[ENH] Migrate mvts_transformer classifier from old `_pytorch.py` to new `_base_torch.py` interface

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#9324 opened on Feb 5, 2026

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enhancementgood first issuemodule:classificationmodule:deep-learning&networks

Description

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

This is a sub-issue of #8699 Migrate the mvts_transformer classifier (implemented in sktime/sktime/classification/deep_learning/) from the old _pytorch.py to new _base_torch.py interface.

Describe the solution you'd like

Currently MVTSTransformerClassifier class inherits from BaseDeepClassifierPytorch class implemented in sktime.classification.deep_learning._pytorch.

Change the inheritance to BaseDeepClassifierPytorch class implemented in sktime.classification.deep_learning.base and ensure non-breakage of current behaviour. If there is a breakage, investigate and implement the fix for a successful migration.

Expectations of the task:

  • Compare the _pytorch.py with _base_torch.py and share your observations on places where there are differences and possible chances of breakage when migrating the mvtc_transformer classifier.
  • Thoughts/ideas on addressing those differences/breakages.
  • Corresponding implementation for the successful migration.

Contributor guide

Tech stack
pythonpytorch
Domain
machine learning
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
PythonPyTorch basicssktime deep learning structure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Compare the old ` pytorch.py` file (in `sktime/classification/deep learning/`) with the new ` base torch.py` interface (in `sktime/classification/deep learning/base/`). Identify differences in inheritance, methods, and any potential breakages. Then implement the migration of `MVTSTransformerClassifier` to inherit from the new base, ensuring backward compatibility. Refer to the parent issue #8699 for broader context.