feat(early_stopping): add get_default_score_fn and get_default_event_filter helpers (#3411)#3745
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…filter helpers Adds two helper methods to EarlyStopping mirroring patterns in Checkpoint and the maintainer's preferred design from the issue thread: - EarlyStopping.get_default_score_fn(metric_name, score_sign=1.0): a static helper that builds a score_function reading engine.state.metrics[metric_name] and applying score_sign (use -1.0 for error-like metrics). - EarlyStopping.get_default_event_filter(after): an instance method that returns a (engine, event) -> bool filter consulting the trainer's epoch counter, so callers can implement a warmup window via Events.COMPLETED( event_filter=handler.get_default_event_filter(after=N)) without coupling the warmup logic to the handler. Uses the trainer epoch (not the host engine's event count) so the warmup is well-defined when the handler is attached to an evaluator that re-runs from scratch each epoch. Both helpers are additive with backwards-compatible defaults and do not change any existing public behavior. Closes part of pytorch#3411
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Summary
Closes part of #3411. Two enhancements explicitly suggested by maintainer @vfdev-5 in the issue thread:
EarlyStopping.get_default_score_fn— analogous toCheckpoint.get_default_score_fn, supportsscore_sign=-1.0for error-like metrics.EarlyStopping.get_default_event_filter— events filtering helper for warmup that consultsself.trainer.state.epoch(fixes the gotcha that evaluators reset their epoch counter on eachrun()).The maintainer pushed back on PR #3661's
min_evalsparameter and explicitly preferred event filtering, which is why this PR ships the filter helper instead.Files
ignite/handlers/early_stopping.py(+88) — both helpers, additive, BC-safe.tests/ignite/handlers/test_early_stopping.py(+136) — 9 new tests covering positive/negative sign, invalid sign, integration withmode="min", invalidafter, zero/non-zero warmup, full engine integration, and attach signature compatibility.Test plan
ruff check+ruff format --checkclean.