Further clean up aggregation logic (#12053)

CHANGELOG.md

@@ -580,6 +580,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Removed `get_mp_spawn_kwargs` from `DDPSpawnStrategy` and `TPUSpawnStrategy` in favor of configuration in the `_SpawnLauncher` ([#11966](https://github.com/PyTorchLightning/pytorch-lightning/pull/11966))
 
 
+- Removed `_aggregate_metrics`, `_reduce_agg_metrics`, and `_finalize_agg_metrics` from `LightningLoggerBase` ([#12053](https://github.com/PyTorchLightning/pytorch-lightning/pull/12053))
+
+
 ### Fixed
 
 - Fixed an issue where `HorovodStrategy.teardown()` did not complete gracefully if an exception was thrown during callback setup [#11752](https://github.com/PyTorchLightning/pytorch-lightning/pull/11752)

pytorch_lightning/loggers/base.py

@@ -19,7 +19,7 @@ import operator
 from abc import ABC, abstractmethod
 from argparse import Namespace
 from functools import wraps
-from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Sequence, Tuple, Union
+from typing import Any, Callable, Dict, Iterable, List, Mapping, Optional, Sequence, Union
 from weakref import ReferenceType
 
 import numpy as np
@@ -123,66 +123,6 @@ class LightningLoggerBase(ABC):
             "`LightningLoggerBase.update_agg_funcs` was deprecated in v1.6 and will be removed in v1.8."
         )
 
-    def _aggregate_metrics(
-        self, metrics: Dict[str, float], step: Optional[int] = None
-    ) -> Tuple[int, Optional[Dict[str, float]]]:
-        """Aggregates metrics.
-
-        .. deprecated:: v1.6
-            This method is deprecated in v1.6 and will be removed in v1.8.
-
-        Args:
-            metrics: Dictionary with metric names as keys and measured quantities as values
-            step: Step number at which the metrics should be recorded
-
-        Returns:
-            Step and aggregated metrics. The return value could be ``None``. In such case, metrics
-            are added to the aggregation list, but not aggregated yet.
-        """
-        # if you still receiving metric from the same step, just accumulate it
-        if step == self._prev_step:
-            self._metrics_to_agg.append(metrics)
-            return step, None
-
-        # compute the metrics
-        agg_step, agg_mets = self._reduce_agg_metrics()
-
-        # as new step received reset accumulator
-        self._metrics_to_agg = [metrics]
-        self._prev_step = step
-        return agg_step, agg_mets
-
-    def _reduce_agg_metrics(self):
-        """Aggregate accumulated metrics.
-
-        See deprecation warning below.
-
-        .. deprecated:: v1.6
-            This method is deprecated in v1.6 and will be removed in v1.8.
-        """
-        # compute the metrics
-        if not self._metrics_to_agg:
-            agg_mets = None
-        elif len(self._metrics_to_agg) == 1:
-            agg_mets = self._metrics_to_agg[0]
-        else:
-            agg_mets = merge_dicts(self._metrics_to_agg, self._agg_key_funcs, self._agg_default_func)
-        return self._prev_step, agg_mets
-
-    def _finalize_agg_metrics(self):
-        """This shall be called before save/close.
-
-        See deprecation warning below.
-
-        .. deprecated:: v1.6
-            This method is deprecated in v1.6 and will be removed in v1.8.
-        """
-        agg_step, metrics_to_log = self._reduce_agg_metrics()
-        self._metrics_to_agg = []
-
-        if metrics_to_log is not None:
-            self.log_metrics(metrics=metrics_to_log, step=agg_step)
-
     def agg_and_log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None):
         """Aggregates and records metrics. This method doesn't log the passed metrics instantaneously, but instead
         it aggregates them and logs only if metrics are ready to be logged.
@@ -195,10 +135,7 @@ class LightningLoggerBase(ABC):
             metrics: Dictionary with metric names as keys and measured quantities as values
             step: Step number at which the metrics should be recorded
         """
-        agg_step, metrics_to_log = self._aggregate_metrics(metrics=metrics, step=step)
-
-        if metrics_to_log:
-            self.log_metrics(metrics=metrics_to_log, step=agg_step)
+        self.log_metrics(metrics=metrics, step=step)
 
     @abstractmethod
     def log_metrics(self, metrics: Dict[str, float], step: Optional[int] = None):
@@ -221,7 +158,7 @@ class LightningLoggerBase(ABC):
         Args:
             params: :class:`~argparse.Namespace` containing the hyperparameters
             args: Optional positional arguments, depends on the specific logger being used
-            kwargs: Optional keywoard arguments, depends on the specific logger being used
+            kwargs: Optional keyword arguments, depends on the specific logger being used
         """
 
     def log_graph(self, model: "pl.LightningModule", input_array=None) -> None:
@@ -235,7 +172,6 @@ class LightningLoggerBase(ABC):
 
     def save(self) -> None:
         """Save log data."""
-        self._finalize_agg_metrics()
 
     def finalize(self, status: str) -> None:
         """Do any processing that is necessary to finalize an experiment.