Log LR using LearningRateMonitor even when LR Scheduler is not defined. #9786
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VirajBagal
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…d. (Lightning-AI#9786) * LR logging works even with no lr scheduler, wrote few extra tests as well * updated changelog * modified code as suggested by DeepSource * added helper functions * opt with no scheduler * rename * chlog * update test Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: rohitgr7 <[email protected]>
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What does this PR do?
In this PR, the
LearningRateMonitorcallback is extended to log learning rates of each optimizer even when LR schedulers are not specified by the user in training.When LR schedulers are not specified,
trainer.optimizersis used instead oftrainer.lr_schedulersfor getting names of the optimizers, and then we iterate over the optimizers to log their learning rates.Extra tests are written to make sure that the learning rates are logged with correct names even when schedulers are not defined.
Motivation
Currently the LR monitor callback only takes effect if the user specifies LR schedulers for training. However, one could want to record what the initial learning rate used for their optimizer's parameter groups even without any LR schedulers. This PR tries to solve this issue.
Fixes #7468
Does your PR introduce any breaking changes?
No
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