Lightning-AI/pytorch-lightning

support len(datamodule)

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#5,965 opened on Feb 14, 2021

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data handlingfeaturegood first issuehelp wanted

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Description

Let's add support for len(datamodule) so we can get the following:

len(datamodule)

# prints:  
# train_dataloder_1:   200 samples
# train_dataloader_2:  500 samples
# tval_dataloder_1:    200 samples
# val_dataloader_2:    500 samples
# test_dataloder_1:    200 samples
# test_dataloader_2:   500 samples

cc @edenafek

Contributor guide

Research direction
Implement the len method on LightningDataModule that returns a dictionary mapping dataloader names to their sample counts, and ensure it prints the desired output when calling len(datamodule).
Tech stack
pythonpytorch
Domain
machine learningbackend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
PythonPyTorchPyTorch Lightning
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60