851cba931e
* Define `best_iteration` only if early stopping is used. This is the behavior specified by the document but not honored in the actual code. - Don't set the attributes if there's no early stopping. - Clean up the code for callbacks, and replace assertions with proper exceptions. - Assign the attributes when early stopping `save_best` is used. - Turn the attributes into Python properties. --------- Co-authored-by: Philip Hyunsu Cho <chohyu01@cs.washington.edu>
597 lines
21 KiB
Python
597 lines
21 KiB
Python
# pylint: disable=too-many-locals, too-many-arguments, invalid-name
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# pylint: disable=too-many-branches, too-many-statements
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"""Training Library containing training routines."""
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import copy
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import os
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import warnings
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from typing import Any, Dict, Iterable, List, Optional, Sequence, Tuple, Union, cast
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import numpy as np
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from ._typing import BoosterParam, Callable, FPreProcCallable
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from .callback import (
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CallbackContainer,
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EarlyStopping,
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EvaluationMonitor,
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TrainingCallback,
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)
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from .compat import SKLEARN_INSTALLED, DataFrame, XGBStratifiedKFold
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from .core import (
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Booster,
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DMatrix,
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Metric,
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Objective,
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XGBoostError,
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_deprecate_positional_args,
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)
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_CVFolds = Sequence["CVPack"]
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def _configure_custom_metric(
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feval: Optional[Metric], custom_metric: Optional[Metric]
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) -> Optional[Metric]:
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if feval is not None:
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link = (
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"https://xgboost.readthedocs.io/en/latest/tutorials/custom_metric_obj.html"
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)
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warnings.warn(
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"`feval` is deprecated, use `custom_metric` instead. They have "
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"different behavior when custom objective is also used."
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f"See {link} for details on the `custom_metric`."
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)
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if feval is not None and custom_metric is not None:
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raise ValueError(
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"Both `feval` and `custom_metric` are supplied. Use `custom_metric` instead."
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)
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eval_metric = custom_metric if custom_metric is not None else feval
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return eval_metric
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@_deprecate_positional_args
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def train(
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params: Dict[str, Any],
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dtrain: DMatrix,
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num_boost_round: int = 10,
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*,
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evals: Optional[Sequence[Tuple[DMatrix, str]]] = None,
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obj: Optional[Objective] = None,
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feval: Optional[Metric] = None,
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maximize: Optional[bool] = None,
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early_stopping_rounds: Optional[int] = None,
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evals_result: Optional[TrainingCallback.EvalsLog] = None,
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verbose_eval: Optional[Union[bool, int]] = True,
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xgb_model: Optional[Union[str, os.PathLike, Booster, bytearray]] = None,
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callbacks: Optional[Sequence[TrainingCallback]] = None,
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custom_metric: Optional[Metric] = None,
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) -> Booster:
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"""Train a booster with given parameters.
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Parameters
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----------
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params :
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Booster params.
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dtrain :
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Data to be trained.
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num_boost_round :
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Number of boosting iterations.
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evals :
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List of validation sets for which metrics will evaluated during training.
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Validation metrics will help us track the performance of the model.
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obj
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Custom objective function. See :doc:`Custom Objective
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</tutorials/custom_metric_obj>` for details.
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feval :
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.. deprecated:: 1.6.0
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Use `custom_metric` instead.
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maximize :
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Whether to maximize feval.
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early_stopping_rounds :
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Activates early stopping. Validation metric needs to improve at least once in
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every **early_stopping_rounds** round(s) to continue training.
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Requires at least one item in **evals**.
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The method returns the model from the last iteration (not the best one). Use
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custom callback or model slicing if the best model is desired.
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If there's more than one item in **evals**, the last entry will be used for early
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stopping.
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If there's more than one metric in the **eval_metric** parameter given in
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**params**, the last metric will be used for early stopping.
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If early stopping occurs, the model will have two additional fields:
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``bst.best_score``, ``bst.best_iteration``.
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evals_result :
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This dictionary stores the evaluation results of all the items in watchlist.
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Example: with a watchlist containing
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``[(dtest,'eval'), (dtrain,'train')]`` and
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a parameter containing ``('eval_metric': 'logloss')``,
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the **evals_result** returns
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.. code-block:: python
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{'train': {'logloss': ['0.48253', '0.35953']},
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'eval': {'logloss': ['0.480385', '0.357756']}}
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verbose_eval :
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Requires at least one item in **evals**.
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If **verbose_eval** is True then the evaluation metric on the validation set is
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printed at each boosting stage.
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If **verbose_eval** is an integer then the evaluation metric on the validation set
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is printed at every given **verbose_eval** boosting stage. The last boosting stage
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/ the boosting stage found by using **early_stopping_rounds** is also printed.
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Example: with ``verbose_eval=4`` and at least one item in **evals**, an evaluation metric
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is printed every 4 boosting stages, instead of every boosting stage.
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xgb_model :
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Xgb model to be loaded before training (allows training continuation).
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callbacks :
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List of callback functions that are applied at end of each iteration.
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It is possible to use predefined callbacks by using
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:ref:`Callback API <callback_api>`.
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.. note::
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States in callback are not preserved during training, which means callback
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objects can not be reused for multiple training sessions without
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reinitialization or deepcopy.
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.. code-block:: python
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for params in parameters_grid:
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# be sure to (re)initialize the callbacks before each run
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callbacks = [xgb.callback.LearningRateScheduler(custom_rates)]
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xgboost.train(params, Xy, callbacks=callbacks)
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custom_metric:
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.. versionadded 1.6.0
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Custom metric function. See :doc:`Custom Metric </tutorials/custom_metric_obj>`
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for details.
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Returns
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-------
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Booster : a trained booster model
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"""
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callbacks = [] if callbacks is None else copy.copy(list(callbacks))
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metric_fn = _configure_custom_metric(feval, custom_metric)
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evals = list(evals) if evals else []
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bst = Booster(params, [dtrain] + [d[0] for d in evals], model_file=xgb_model)
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start_iteration = 0
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if verbose_eval:
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verbose_eval = 1 if verbose_eval is True else verbose_eval
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callbacks.append(EvaluationMonitor(period=verbose_eval))
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if early_stopping_rounds:
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callbacks.append(EarlyStopping(rounds=early_stopping_rounds, maximize=maximize))
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cb_container = CallbackContainer(
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callbacks,
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metric=metric_fn,
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# For old `feval` parameter, the behavior is unchanged. For the new
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# `custom_metric`, it will receive proper prediction result when custom objective
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# is not used.
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output_margin=callable(obj) or metric_fn is feval,
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)
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bst = cb_container.before_training(bst)
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for i in range(start_iteration, num_boost_round):
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if cb_container.before_iteration(bst, i, dtrain, evals):
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break
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bst.update(dtrain, i, obj)
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if cb_container.after_iteration(bst, i, dtrain, evals):
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break
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bst = cb_container.after_training(bst)
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if evals_result is not None:
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evals_result.update(cb_container.history)
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# Copy to serialise and unserialise booster to reset state and free
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# training memory
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return bst.copy()
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class CVPack:
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""" "Auxiliary datastruct to hold one fold of CV."""
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def __init__(
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self, dtrain: DMatrix, dtest: DMatrix, param: Optional[Union[Dict, List]]
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) -> None:
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""" "Initialize the CVPack"""
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self.dtrain = dtrain
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self.dtest = dtest
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self.watchlist = [(dtrain, "train"), (dtest, "test")]
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self.bst = Booster(param, [dtrain, dtest])
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def __getattr__(self, name: str) -> Callable:
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def _inner(*args: Any, **kwargs: Any) -> Any:
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return getattr(self.bst, name)(*args, **kwargs)
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return _inner
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def update(self, iteration: int, fobj: Optional[Objective]) -> None:
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""" "Update the boosters for one iteration"""
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self.bst.update(self.dtrain, iteration, fobj)
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def eval(self, iteration: int, feval: Optional[Metric], output_margin: bool) -> str:
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""" "Evaluate the CVPack for one iteration."""
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return self.bst.eval_set(self.watchlist, iteration, feval, output_margin)
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class _PackedBooster:
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def __init__(self, cvfolds: _CVFolds) -> None:
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self.cvfolds = cvfolds
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def update(self, iteration: int, obj: Optional[Objective]) -> None:
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"""Iterate through folds for update"""
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for fold in self.cvfolds:
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fold.update(iteration, obj)
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def eval(
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self, iteration: int, feval: Optional[Metric], output_margin: bool
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) -> List[str]:
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"""Iterate through folds for eval"""
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result = [f.eval(iteration, feval, output_margin) for f in self.cvfolds]
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return result
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def set_attr(self, **kwargs: Optional[Any]) -> Any:
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"""Iterate through folds for setting attributes"""
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for f in self.cvfolds:
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f.bst.set_attr(**kwargs)
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def attr(self, key: str) -> Optional[str]:
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"""Redirect to booster attr."""
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return self.cvfolds[0].bst.attr(key)
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def set_param(
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self,
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params: Union[Dict, Iterable[Tuple[str, Any]], str],
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value: Optional[str] = None,
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) -> None:
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"""Iterate through folds for set_param"""
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for f in self.cvfolds:
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f.bst.set_param(params, value)
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def num_boosted_rounds(self) -> int:
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"""Number of boosted rounds."""
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return self.cvfolds[0].num_boosted_rounds()
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@property
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def best_iteration(self) -> int:
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"""Get best_iteration"""
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return int(cast(int, self.cvfolds[0].bst.attr("best_iteration")))
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@best_iteration.setter
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def best_iteration(self, iteration: int) -> None:
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"""Get best_iteration"""
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self.set_attr(best_iteration=iteration)
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@property
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def best_score(self) -> float:
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"""Get best_score."""
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return float(cast(float, self.cvfolds[0].bst.attr("best_score")))
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@best_score.setter
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def best_score(self, score: float) -> None:
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self.set_attr(best_score=score)
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def groups_to_rows(groups: List[np.ndarray], boundaries: np.ndarray) -> np.ndarray:
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"""
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Given group row boundaries, convert ground indexes to row indexes
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:param groups: list of groups for testing
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:param boundaries: rows index limits of each group
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:return: row in group
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"""
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return np.concatenate([np.arange(boundaries[g], boundaries[g + 1]) for g in groups])
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def mkgroupfold(
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dall: DMatrix,
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nfold: int,
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param: BoosterParam,
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evals: Sequence[str] = (),
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fpreproc: Optional[FPreProcCallable] = None,
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shuffle: bool = True,
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) -> List[CVPack]:
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"""
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Make n folds for cross-validation maintaining groups
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:return: cross-validation folds
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"""
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# we have groups for pairwise ranking... get a list of the group indexes
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group_boundaries = dall.get_uint_info("group_ptr")
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group_sizes = np.diff(group_boundaries)
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if shuffle is True:
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idx = np.random.permutation(len(group_sizes))
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else:
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idx = np.arange(len(group_sizes))
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# list by fold of test group indexes
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out_group_idset = np.array_split(idx, nfold)
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# list by fold of train group indexes
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in_group_idset = [
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np.concatenate([out_group_idset[i] for i in range(nfold) if k != i])
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for k in range(nfold)
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]
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# from the group indexes, convert them to row indexes
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in_idset = [
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groups_to_rows(in_groups, group_boundaries) for in_groups in in_group_idset
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]
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out_idset = [
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groups_to_rows(out_groups, group_boundaries) for out_groups in out_group_idset
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]
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# build the folds by taking the appropriate slices
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ret = []
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for k in range(nfold):
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# perform the slicing using the indexes determined by the above methods
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dtrain = dall.slice(in_idset[k], allow_groups=True)
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dtrain.set_group(group_sizes[in_group_idset[k]])
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dtest = dall.slice(out_idset[k], allow_groups=True)
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dtest.set_group(group_sizes[out_group_idset[k]])
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# run preprocessing on the data set if needed
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if fpreproc is not None:
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dtrain, dtest, tparam = fpreproc(dtrain, dtest, param.copy())
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else:
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tparam = param
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plst = list(tparam.items()) + [("eval_metric", itm) for itm in evals]
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ret.append(CVPack(dtrain, dtest, plst))
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return ret
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def mknfold(
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dall: DMatrix,
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nfold: int,
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param: BoosterParam,
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seed: int,
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evals: Sequence[str] = (),
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fpreproc: Optional[FPreProcCallable] = None,
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stratified: Optional[bool] = False,
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folds: Optional[XGBStratifiedKFold] = None,
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shuffle: bool = True,
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) -> List[CVPack]:
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"""
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Make an n-fold list of CVPack from random indices.
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"""
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evals = list(evals)
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np.random.seed(seed)
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if stratified is False and folds is None:
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# Do standard k-fold cross validation. Automatically determine the folds.
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if len(dall.get_uint_info("group_ptr")) > 1:
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return mkgroupfold(
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dall, nfold, param, evals=evals, fpreproc=fpreproc, shuffle=shuffle
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)
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if shuffle is True:
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idx = np.random.permutation(dall.num_row())
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else:
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idx = np.arange(dall.num_row())
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out_idset = np.array_split(idx, nfold)
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in_idset = [
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np.concatenate([out_idset[i] for i in range(nfold) if k != i])
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for k in range(nfold)
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]
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elif folds is not None:
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# Use user specified custom split using indices
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try:
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in_idset = [x[0] for x in folds]
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out_idset = [x[1] for x in folds]
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except TypeError:
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# Custom stratification using Sklearn KFoldSplit object
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splits = list(folds.split(X=dall.get_label(), y=dall.get_label()))
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in_idset = [x[0] for x in splits]
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out_idset = [x[1] for x in splits]
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nfold = len(out_idset)
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else:
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# Do standard stratefied shuffle k-fold split
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sfk = XGBStratifiedKFold(n_splits=nfold, shuffle=True, random_state=seed)
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splits = list(sfk.split(X=dall.get_label(), y=dall.get_label()))
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in_idset = [x[0] for x in splits]
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out_idset = [x[1] for x in splits]
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nfold = len(out_idset)
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ret = []
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for k in range(nfold):
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# perform the slicing using the indexes determined by the above methods
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dtrain = dall.slice(in_idset[k])
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dtest = dall.slice(out_idset[k])
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# run preprocessing on the data set if needed
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if fpreproc is not None:
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dtrain, dtest, tparam = fpreproc(dtrain, dtest, param.copy())
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else:
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tparam = param
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plst = list(tparam.items()) + [("eval_metric", itm) for itm in evals]
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ret.append(CVPack(dtrain, dtest, plst))
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return ret
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def cv(
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params: BoosterParam,
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dtrain: DMatrix,
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num_boost_round: int = 10,
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nfold: int = 3,
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stratified: bool = False,
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folds: XGBStratifiedKFold = None,
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metrics: Sequence[str] = (),
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obj: Optional[Objective] = None,
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feval: Optional[Metric] = None,
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maximize: Optional[bool] = None,
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early_stopping_rounds: Optional[int] = None,
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fpreproc: Optional[FPreProcCallable] = None,
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as_pandas: bool = True,
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verbose_eval: Optional[Union[int, bool]] = None,
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show_stdv: bool = True,
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seed: int = 0,
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callbacks: Optional[Sequence[TrainingCallback]] = None,
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shuffle: bool = True,
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custom_metric: Optional[Metric] = None,
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) -> Union[Dict[str, float], DataFrame]:
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# pylint: disable = invalid-name
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"""Cross-validation with given parameters.
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Parameters
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----------
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params : dict
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Booster params.
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dtrain : DMatrix
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Data to be trained.
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num_boost_round : int
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Number of boosting iterations.
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nfold : int
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Number of folds in CV.
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stratified : bool
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Perform stratified sampling.
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folds : a KFold or StratifiedKFold instance or list of fold indices
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Sklearn KFolds or StratifiedKFolds object.
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Alternatively may explicitly pass sample indices for each fold.
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For ``n`` folds, **folds** should be a length ``n`` list of tuples.
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Each tuple is ``(in,out)`` where ``in`` is a list of indices to be used
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as the training samples for the ``n`` th fold and ``out`` is a list of
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indices to be used as the testing samples for the ``n`` th fold.
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metrics : string or list of strings
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Evaluation metrics to be watched in CV.
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obj :
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Custom objective function. See :doc:`Custom Objective
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|
</tutorials/custom_metric_obj>` for details.
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|
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feval : function
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|
.. deprecated:: 1.6.0
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|
Use `custom_metric` instead.
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maximize : bool
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Whether to maximize feval.
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early_stopping_rounds: int
|
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Activates early stopping. Cross-Validation metric (average of validation
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metric computed over CV folds) needs to improve at least once in
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every **early_stopping_rounds** round(s) to continue training.
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|
The last entry in the evaluation history will represent the best iteration.
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|
If there's more than one metric in the **eval_metric** parameter given in
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**params**, the last metric will be used for early stopping.
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fpreproc : function
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Preprocessing function that takes (dtrain, dtest, param) and returns
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transformed versions of those.
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as_pandas : bool, default True
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Return pd.DataFrame when pandas is installed.
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If False or pandas is not installed, return np.ndarray
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verbose_eval : bool, int, or None, default None
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Whether to display the progress. If None, progress will be displayed
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|
when np.ndarray is returned. If True, progress will be displayed at
|
|
boosting stage. If an integer is given, progress will be displayed
|
|
at every given `verbose_eval` boosting stage.
|
|
show_stdv : bool, default True
|
|
Whether to display the standard deviation in progress.
|
|
Results are not affected, and always contains std.
|
|
seed : int
|
|
Seed used to generate the folds (passed to numpy.random.seed).
|
|
callbacks :
|
|
List of callback functions that are applied at end of each iteration.
|
|
It is possible to use predefined callbacks by using
|
|
:ref:`Callback API <callback_api>`.
|
|
|
|
.. note::
|
|
|
|
States in callback are not preserved during training, which means callback
|
|
objects can not be reused for multiple training sessions without
|
|
reinitialization or deepcopy.
|
|
|
|
.. code-block:: python
|
|
|
|
for params in parameters_grid:
|
|
# be sure to (re)initialize the callbacks before each run
|
|
callbacks = [xgb.callback.LearningRateScheduler(custom_rates)]
|
|
xgboost.train(params, Xy, callbacks=callbacks)
|
|
|
|
shuffle : bool
|
|
Shuffle data before creating folds.
|
|
custom_metric :
|
|
|
|
.. versionadded 1.6.0
|
|
|
|
Custom metric function. See :doc:`Custom Metric </tutorials/custom_metric_obj>`
|
|
for details.
|
|
|
|
Returns
|
|
-------
|
|
evaluation history : list(string)
|
|
"""
|
|
if stratified is True and not SKLEARN_INSTALLED:
|
|
raise XGBoostError(
|
|
"sklearn needs to be installed in order to use stratified cv"
|
|
)
|
|
|
|
if isinstance(metrics, str):
|
|
metrics = [metrics]
|
|
|
|
params = params.copy()
|
|
if isinstance(params, list):
|
|
_metrics = [x[1] for x in params if x[0] == "eval_metric"]
|
|
params = dict(params)
|
|
if "eval_metric" in params:
|
|
params["eval_metric"] = _metrics
|
|
|
|
if (not metrics) and "eval_metric" in params:
|
|
if isinstance(params["eval_metric"], list):
|
|
metrics = params["eval_metric"]
|
|
else:
|
|
metrics = [params["eval_metric"]]
|
|
|
|
params.pop("eval_metric", None)
|
|
|
|
results: Dict[str, List[float]] = {}
|
|
cvfolds = mknfold(
|
|
dtrain, nfold, params, seed, metrics, fpreproc, stratified, folds, shuffle
|
|
)
|
|
|
|
metric_fn = _configure_custom_metric(feval, custom_metric)
|
|
|
|
# setup callbacks
|
|
callbacks = [] if callbacks is None else copy.copy(list(callbacks))
|
|
|
|
if verbose_eval:
|
|
verbose_eval = 1 if verbose_eval is True else verbose_eval
|
|
callbacks.append(EvaluationMonitor(period=verbose_eval, show_stdv=show_stdv))
|
|
if early_stopping_rounds:
|
|
callbacks.append(EarlyStopping(rounds=early_stopping_rounds, maximize=maximize))
|
|
callbacks_container = CallbackContainer(
|
|
callbacks,
|
|
metric=metric_fn,
|
|
is_cv=True,
|
|
output_margin=callable(obj) or metric_fn is feval,
|
|
)
|
|
|
|
booster = _PackedBooster(cvfolds)
|
|
callbacks_container.before_training(booster)
|
|
|
|
for i in range(num_boost_round):
|
|
if callbacks_container.before_iteration(booster, i, dtrain, None):
|
|
break
|
|
booster.update(i, obj)
|
|
|
|
should_break = callbacks_container.after_iteration(booster, i, dtrain, None)
|
|
res = callbacks_container.aggregated_cv
|
|
for key, mean, std in cast(List[Tuple[str, float, float]], res):
|
|
if key + "-mean" not in results:
|
|
results[key + "-mean"] = []
|
|
if key + "-std" not in results:
|
|
results[key + "-std"] = []
|
|
results[key + "-mean"].append(mean)
|
|
results[key + "-std"].append(std)
|
|
|
|
if should_break:
|
|
for k in results.keys(): # pylint: disable=consider-iterating-dictionary
|
|
results[k] = results[k][: (booster.best_iteration + 1)]
|
|
break
|
|
if as_pandas:
|
|
try:
|
|
import pandas as pd
|
|
|
|
results = pd.DataFrame.from_dict(results)
|
|
except ImportError:
|
|
pass
|
|
|
|
callbacks_container.after_training(booster)
|
|
|
|
return results
|