#!/usr/bin/env python3
# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
# pyre-strict
import itertools
import logging
from collections import defaultdict
from datetime import timedelta
from logging import Logger
from typing import (
Any,
Callable,
cast,
Dict,
Iterable,
List,
Optional,
Tuple,
TYPE_CHECKING,
Union,
)
import gpytorch
import numpy as np
import pandas as pd
import plotly.graph_objects as go
from ax.core.base_trial import TrialStatus
from ax.core.data import Data
from ax.core.experiment import Experiment
from ax.core.generator_run import GeneratorRunType
from ax.core.map_data import MapData
from ax.core.map_metric import MapMetric
from ax.core.metric import Metric
from ax.core.multi_type_experiment import MultiTypeExperiment
from ax.core.objective import MultiObjective, ScalarizedObjective
from ax.core.optimization_config import OptimizationConfig
from ax.core.parameter import Parameter
from ax.core.trial import BaseTrial
from ax.early_stopping.strategies.base import BaseEarlyStoppingStrategy
from ax.exceptions.core import DataRequiredError, UserInputError
from ax.modelbridge import ModelBridge
from ax.modelbridge.cross_validation import (
compute_model_fit_metrics_from_modelbridge,
cross_validate,
)
from ax.modelbridge.generation_strategy import GenerationStrategy
from ax.modelbridge.random import RandomModelBridge
from ax.modelbridge.torch import TorchModelBridge
from ax.plot.contour import interact_contour_plotly
from ax.plot.diagnostic import interact_cross_validation_plotly
from ax.plot.feature_importances import plot_feature_importance_by_feature_plotly
from ax.plot.helper import get_range_parameters_from_list
from ax.plot.pareto_frontier import (
_pareto_frontier_plot_input_processing,
_validate_experiment_and_get_optimization_config,
scatter_plot_with_hypervolume_trace_plotly,
scatter_plot_with_pareto_frontier_plotly,
)
from ax.plot.pareto_utils import _extract_observed_pareto_2d
from ax.plot.scatter import interact_fitted_plotly, plot_multiple_metrics
from ax.plot.slice import interact_slice_plotly
from ax.plot.trace import (
map_data_multiple_metrics_dropdown_plotly,
plot_objective_value_vs_trial_index,
)
from ax.service.utils.best_point import _derel_opt_config_wrapper, _is_row_feasible
from ax.service.utils.early_stopping import get_early_stopping_metrics
from ax.utils.common.logger import get_logger
from ax.utils.common.typeutils import checked_cast, not_none
from ax.utils.sensitivity.sobol_measures import ax_parameter_sens
from pandas.core.frame import DataFrame
if TYPE_CHECKING:
from ax.service.scheduler import Scheduler
logger: Logger = get_logger(__name__)
FEATURE_IMPORTANCE_CAPTION = (
"<b>NOTE:</b> This plot is intended for advanced users. Specifically,<br>"
"it is a measure of sensitivity/smoothness, so parameters of<br>"
"relatively low importance may still be important to tune."
)
CROSS_VALIDATION_CAPTION = (
"<b>NOTE:</b> We have tried our best to only plot the region of interest.<br>"
"This may hide outliers. You can autoscale the axes to see all trials."
)
FEASIBLE_COL_NAME = "is_feasible"
BASELINE_ARM_NAME = "baseline_arm"
UNPREDICTABLE_METRICS_MESSAGE = (
"The following metric(s) are behaving unpredictably and may be noisy or "
"misconfigured: {}. Please check that they are measuring the intended quantity, "
"and are expected to vary reliably as a function of your parameters."
)
def _get_cross_validation_plots(model: ModelBridge) -> List[go.Figure]:
cv = cross_validate(model=model)
return [
interact_cross_validation_plotly(
cv_results=cv, caption=CROSS_VALIDATION_CAPTION
)
]
def _get_objective_trace_plot(
experiment: Experiment,
data: Data,
true_objective_metric_name: Optional[str] = None,
) -> Iterable[go.Figure]:
if experiment.is_moo_problem:
return [
scatter_plot_with_hypervolume_trace_plotly(experiment=experiment),
*_pairwise_pareto_plotly_scatter(experiment=experiment),
]
runner = experiment.runner
run_metadata_report_keys = None
if runner is not None:
run_metadata_report_keys = runner.run_metadata_report_keys
exp_df = exp_to_df(exp=experiment, run_metadata_fields=run_metadata_report_keys)
optimization_config = experiment.optimization_config
if optimization_config is None:
return []
metric_names = (
metric_name
for metric_name in [
optimization_config.objective.metric.name,
true_objective_metric_name,
]
if metric_name is not None
)
plots = [
plot_objective_value_vs_trial_index(
exp_df=exp_df,
metric_colname=metric_name,
minimize=not_none(
optimization_config.objective.minimize
if optimization_config.objective.metric.name == metric_name
else experiment.metrics[metric_name].lower_is_better
),
title=f"Best {metric_name} found vs. trial index",
hover_data_colnames=run_metadata_report_keys,
)
for metric_name in metric_names
]
return [plot for plot in plots if plot is not None]
def _get_objective_v_param_plots(
experiment: Experiment,
model: ModelBridge,
importance: Optional[
Union[Dict[str, Dict[str, np.ndarray]], Dict[str, Dict[str, float]]]
] = None,
# Chosen to take ~1min on local benchmarks.
max_num_slice_plots: int = 200,
# Chosen to take ~2min on local benchmarks.
max_num_contour_plots: int = 20,
) -> List[go.Figure]:
search_space = experiment.search_space
range_params = [
checked_cast(Parameter, param)
for param in search_space.range_parameters.values()
]
range_params = get_range_parameters_from_list(range_params, min_num_values=5)
if len(range_params) < 1:
# if search space contains no range params
logger.warning(
"`_get_objective_v_param_plot` requires a search space with at least one "
"`RangeParameter`. Returning an empty list."
)
return []
range_param_names = [param.name for param in range_params]
num_range_params = len(range_params)
num_metrics = len(model.metric_names)
num_slice_plots = num_range_params * num_metrics
output_plots = []
if num_slice_plots <= max_num_slice_plots:
# parameter slice plot
output_plots += [
interact_slice_plotly(
model=model,
)
]
else:
warning_msg = (
f"Skipping creation of {num_slice_plots} slice plots since that "
f"exceeds <br>`max_num_slice_plots = {max_num_slice_plots}`."
"<br>Users can plot individual slice plots with the <br>python "
"function ax.plot.slice.plot_slice_plotly."
)
# TODO: return a warning here then convert to a plot/message/etc. downstream.
warning_plot = _warn_and_create_warning_plot(warning_msg=warning_msg)
output_plots.append(warning_plot)
# contour plots
num_contour_per_metric = max_num_contour_plots // num_metrics
if num_contour_per_metric < 2:
warning_msg = (
"Skipping creation of contour plots since that requires <br>"
"`max_num_contour_plots >= 2 * num_metrics`. Got "
f"{max_num_contour_plots=} and {num_metrics=}."
"<br>Users can plot individual contour plots with the <br>python "
"function ax.plot.contour.plot_contour_plotly."
)
# TODO: return a warning here then convert to a plot/message/etc. downstream.
warning_plot = _warn_and_create_warning_plot(warning_msg=warning_msg)
output_plots.append(warning_plot)
elif num_range_params > 1:
# Using n params yields n * (n - 1) contour plots, so we use the number of
# params that yields the desired number of plots (solved using quadratic eqn)
num_params_per_metric = int(0.5 + (0.25 + num_contour_per_metric) ** 0.5)
try:
for metric_name in model.metric_names:
if importance is not None:
range_params_sens_for_metric = {
k: v
for k, v in importance[metric_name].items()
if k in range_param_names
}
# sort the params by their sensitivity
params_to_use = sorted(
range_params_sens_for_metric,
key=lambda x: range_params_sens_for_metric[x],
reverse=True,
)[:num_params_per_metric]
# if sens is not available, just use the first num_features_per_metric.
else:
params_to_use = range_param_names[:num_params_per_metric]
with gpytorch.settings.max_eager_kernel_size(float("inf")):
output_plots.append(
interact_contour_plotly(
model=not_none(model),
metric_name=metric_name,
parameters_to_use=params_to_use,
)
)
logger.info(
f"Created contour plots for metric {metric_name} and parameters "
f"{params_to_use}."
)
# `mean shape torch.Size` RunTimeErrors, pending resolution of
# https://github.com/cornellius-gp/gpytorch/issues/1853
except RuntimeError as e:
logger.warning(f"Contour plotting failed with error: {e}.")
return output_plots
def _get_suffix(input_str: str, delim: str = ".", n_chunks: int = 1) -> str:
return delim.join(input_str.split(delim)[-n_chunks:])
def _get_shortest_unique_suffix_dict(
input_str_list: List[str], delim: str = "."
) -> Dict[str, str]:
"""Maps a list of strings to their shortest unique suffixes
Maps all original strings to the smallest number of chunks, as specified by
delim, that are not a suffix of any other original string. If the original
string was a suffix of another string, map it to its unaltered self.
Args:
input_str_list: a list of strings to create the suffix mapping for
delim: the delimiter used to split up the strings into meaningful chunks
Returns:
dict: A dict with the original strings as keys and their abbreviations as
values
"""
# all input strings must be unique
assert len(input_str_list) == len(set(input_str_list))
if delim == "":
raise ValueError("delim must be a non-empty string.")
suffix_dict = defaultdict(list)
# initialize suffix_dict with last chunk
for istr in input_str_list:
suffix_dict[_get_suffix(istr, delim=delim, n_chunks=1)].append(istr)
max_chunks = max(len(istr.split(delim)) for istr in input_str_list)
if max_chunks == 1:
return {istr: istr for istr in input_str_list}
# the upper range of this loop is `max_chunks + 2` because:
# - `i` needs to take the value of `max_chunks`, hence one +1
# - the contents of the loop are run one more time to check if `all_unique`,
# hence the other +1
for i in range(2, max_chunks + 2):
new_dict = defaultdict(list)
all_unique = True
for suffix, suffix_str_list in suffix_dict.items():
if len(suffix_str_list) > 1:
all_unique = False
for istr in suffix_str_list:
new_dict[_get_suffix(istr, delim=delim, n_chunks=i)].append(istr)
else:
new_dict[suffix] = suffix_str_list
if all_unique:
if len(set(input_str_list)) != len(suffix_dict.keys()):
break
return {
suffix_str_list[0]: suffix
for suffix, suffix_str_list in suffix_dict.items()
}
suffix_dict = new_dict
# If this function has not yet exited, some input strings still share a suffix.
# This is not expected, but in this case, the function will return the identity
# mapping, i.e., a dict with the original strings as both keys and values.
logger.warning(
"Something went wrong. Returning dictionary with original strings as keys and "
"values."
)
return {istr: istr for istr in input_str_list}
[docs]def get_standard_plots(
experiment: Experiment,
model: Optional[ModelBridge],
data: Optional[Data] = None,
true_objective_metric_name: Optional[str] = None,
early_stopping_strategy: Optional[BaseEarlyStoppingStrategy] = None,
limit_points_per_plot: Optional[int] = None,
global_sensitivity_analysis: bool = True,
) -> List[go.Figure]:
"""Extract standard plots for single-objective optimization.
Extracts a list of plots from an ``Experiment`` and ``ModelBridge`` of general
interest to an Ax user. Currently not supported are
- TODO: multi-objective optimization
- TODO: ChoiceParameter plots
Args:
- experiment: The ``Experiment`` from which to obtain standard plots.
- model: The ``ModelBridge`` used to suggest trial parameters.
- true_objective_metric_name: Name of the metric to use as the true objective.
- early_stopping_strategy: Early stopping strategy used throughout the
experiment; used for visualizing when curves are stopped.
- limit_points_per_plot: Limit the number of points used per metric in
each curve plot. Passed to `_get_curve_plot_dropdown`.
- global_sensitivity_analysis: If True, plot total Variance-based sensitivity
analysis for the model parameters. If False, plot sensitivities based on
GP kernel lengthscales. Defaults to True.
Returns:
- a plot of objective value vs. trial index, to show experiment progression
- a plot of objective value vs. range parameter values, only included if the
model associated with generation_strategy can create predictions. This
consists of:
- a plot_slice plot if the search space contains one range parameter
- an interact_contour plot if the search space contains multiple
range parameters
"""
if (
true_objective_metric_name is not None
and true_objective_metric_name not in experiment.metrics.keys()
):
raise ValueError(
f"true_objective_metric_name='{true_objective_metric_name}' is not present "
f"in experiment.metrics={experiment.metrics}. Please add a valid "
"true_objective_metric_name or remove the optional parameter to get "
"standard plots."
)
objective = not_none(experiment.optimization_config).objective
if isinstance(objective, ScalarizedObjective):
logger.warning(
"get_standard_plots does not currently support ScalarizedObjective "
"optimization experiments. Returning an empty list."
)
return []
if data is None:
data = experiment.fetch_data()
if data.df.empty:
logger.info(f"Experiment {experiment} does not yet have data, nothing to plot.")
return []
output_plot_list = []
try:
output_plot_list.extend(
_get_objective_trace_plot(
experiment=experiment,
data=data,
true_objective_metric_name=true_objective_metric_name,
)
)
except Exception as e:
# Allow model-based plotting to proceed if objective_trace plotting fails.
logger.exception(f"Plotting `objective_trace` failed with error {e}")
# Objective vs. parameter plot requires a `Model`, so add it only if model
# is alrady available. In cases where initially custom trials are attached,
# model might not yet be set on the generation strategy. Additionally, if
# the model is a RandomModelBridge, skip plots that require predictions.
if model is not None and not isinstance(model, RandomModelBridge):
try:
if true_objective_metric_name is not None:
logger.debug("Starting objective vs. true objective scatter plot.")
output_plot_list.append(
_objective_vs_true_objective_scatter(
model=model,
objective_metric_name=objective.metric_names[0],
true_objective_metric_name=true_objective_metric_name,
)
)
logger.debug("Finished with objective vs. true objective scatter plot.")
except Exception as e:
logger.exception(f"Scatter plot failed with error: {e}")
# Compute feature importance ("sensitivity") to select most important
# features to plot.
sens = None
importance_measure = ""
if global_sensitivity_analysis and isinstance(model, TorchModelBridge):
try:
logger.debug("Starting global sensitivity analysis.")
sens = ax_parameter_sens(model, order="total")
importance_measure = (
'<a href="https://en.wikipedia.org/wiki/Variance-based_'
'sensitivity_analysis">Variance-based sensitivity analysis</a>'
)
logger.debug("Finished global sensitivity analysis.")
except Exception as e:
logger.info(
f"Failed to compute signed global feature sensitivities: {e}"
"Trying to get unsigned feature sensitivities."
)
try:
sens = ax_parameter_sens(model, order="total", signed=False)
except Exception as e:
logger.exception(
f"Failed to compute unsigned feature sensitivities: {e}"
)
if sens is None:
try:
sens = {
metric_name: model.feature_importances(metric_name)
for i, metric_name in enumerate(sorted(model.metric_names))
}
except Exception as e:
logger.info(f"Failed to compute feature importances: {e}")
try:
logger.debug("Starting objective vs. param plots.")
# importance is the absolute value of sensitivity.
importance = None
if sens is not None:
importance = {
k: {j: np.absolute(sens[k][j]) for j in sens[k].keys()}
for k in sens.keys()
}
output_plot_list.extend(
_get_objective_v_param_plots(
experiment=experiment,
model=model,
importance=importance,
)
)
logger.debug("Finished objective vs. param plots.")
except Exception as e:
logger.exception(f"Slice plot failed with error: {e}")
try:
logger.debug("Starting cross validation plot.")
output_plot_list.extend(_get_cross_validation_plots(model=model))
logger.debug("Finished cross validation plot.")
except Exception as e:
logger.exception(f"Cross-validation plot failed with error: {e}")
# sensitivity plot
try:
logger.debug("Starting feature importance plot.")
feature_importance_plot = plot_feature_importance_by_feature_plotly(
model=model,
# pyre-ignore [6]:
# In call for argument `sensitivity_values`, expected
# `Optional[Dict[str, Dict[str, Union[float, ndarray]]]]`
# but got `Dict[str, Dict[str, ndarray]]`.
sensitivity_values=sens,
relative=False,
caption=FEATURE_IMPORTANCE_CAPTION if importance_measure == "" else "",
importance_measure=importance_measure,
)
logger.debug("Finished feature importance plot.")
feature_importance_plot.layout.title = "[ADVANCED] " + str(
# pyre-fixme[16]: go.Figure has no attribute `layout`
feature_importance_plot.layout.title.text
)
output_plot_list.append(feature_importance_plot)
output_plot_list.append(interact_fitted_plotly(model=model, rel=False))
except Exception as e:
logger.exception(f"Feature importance plot failed with error: {e}")
# Get plots for MapMetrics
try:
logger.debug("Starting MapMetric plots.")
map_metrics = [
m for m in experiment.metrics.values() if isinstance(m, MapMetric)
]
if map_metrics:
# Sort so that objective metrics appear first
map_metrics.sort(
key=lambda e: e.name in [m.name for m in objective.metrics],
reverse=True,
)
for by_walltime in [False, True]:
logger.debug(f"Starting MapMetric plot {by_walltime=}.")
output_plot_list.append(
_get_curve_plot_dropdown(
experiment=experiment,
map_metrics=map_metrics,
data=data, # pyre-ignore
early_stopping_strategy=early_stopping_strategy,
by_walltime=by_walltime,
limit_points_per_plot=limit_points_per_plot,
)
)
logger.debug(f"Finished MapMetric plot {by_walltime=}.")
logger.debug("Finished MapMetric plots.")
except Exception as e:
logger.exception(f"Curve plot failed with error: {e}")
logger.debug("Returning plots.")
return [plot for plot in output_plot_list if plot is not None]
def _transform_progression_to_walltime(
progressions: np.ndarray, exp_df: pd.DataFrame, trial_idx: int
) -> Optional[np.ndarray]:
try:
trial_df = exp_df[exp_df["trial_index"] == trial_idx]
time_run_started = trial_df["time_run_started"].iloc[0]
time_completed = trial_df["time_completed"].iloc[0]
runtime_seconds = (time_completed - time_run_started).total_seconds()
intermediate_times = runtime_seconds * progressions / progressions.max()
transformed_times = np.array(
[time_run_started + timedelta(seconds=t) for t in intermediate_times]
)
return transformed_times
except Exception as e:
logger.info(f"Failed to transform progression to walltime: {e}")
return None
def _get_curve_plot_dropdown(
experiment: Experiment,
map_metrics: Iterable[MapMetric],
data: MapData,
early_stopping_strategy: Optional[BaseEarlyStoppingStrategy],
by_walltime: bool = False,
limit_points_per_plot: Optional[int] = None,
) -> Optional[go.Figure]:
"""Plot curve metrics by either progression or walltime.
Args:
experiment: The experiment to generate plots for.
map_metrics: The list of metrics to generate plots for. Each metric
will be one entry in the dropdown.
data: The map data used to generate the plots.
early_stopping_strategy: An instance of ``BaseEarlyStoppingStrategy``. This
is used to check which metrics are being used for early stopping.
by_walltime: If true, the x-axis will be walltime. If false, the x-axis is
the progression of the trials (trials are 'stacked').
limit_points_per_plot: Limit the total number of data points used per plot
(i.e., per metric). This is passed down to `MapData.subsample(...)` to
subsample the data. Useful for keeping the plots of manageable size.
"""
early_stopping_metrics = get_early_stopping_metrics(
experiment=experiment, early_stopping_strategy=early_stopping_strategy
)
xs_by_metric = {}
ys_by_metric = {}
legend_labels_by_metric = {}
stopping_markers_by_metric = {}
exp_df = pd.DataFrame()
if by_walltime:
exp_df = exp_to_df(
exp=experiment,
trial_attribute_fields=["time_run_started", "time_completed"],
always_include_field_columns=True,
)
for m in map_metrics:
map_key = m.map_key_info.key
subsampled_data = (
data
if limit_points_per_plot is None
else data.subsample(
limit_rows_per_metric=limit_points_per_plot, map_key=map_key
)
)
map_df = subsampled_data.map_df
metric_df = map_df[map_df["metric_name"] == m.name]
xs, ys, legend_labels, plot_stopping_markers = [], [], [], []
is_early_stopping_metric = m.name in early_stopping_metrics
for trial_idx, df_g in metric_df.groupby("trial_index"):
if experiment.trials[trial_idx].status not in (
TrialStatus.COMPLETED,
TrialStatus.EARLY_STOPPED,
):
continue
if by_walltime:
x = _transform_progression_to_walltime(
progressions=df_g[map_key].to_numpy(),
exp_df=exp_df,
trial_idx=trial_idx,
)
if x is None:
continue
else:
x = df_g[map_key].to_numpy()
xs.append(x)
ys.append(df_g["mean"].to_numpy())
legend_labels.append(f"Trial {trial_idx}")
plot_stopping_markers.append(
is_early_stopping_metric
and experiment.trials[trial_idx].status == TrialStatus.EARLY_STOPPED
)
if len(xs) > 0:
xs_by_metric[m.name] = xs
ys_by_metric[m.name] = ys
legend_labels_by_metric[m.name] = legend_labels
stopping_markers_by_metric[m.name] = plot_stopping_markers
if len(xs_by_metric.keys()) == 0:
return None
title = (
"Curve metrics (i.e., learning curves) by walltime"
if by_walltime
else "Curve metrics (i.e., learning curves) by progression"
)
return map_data_multiple_metrics_dropdown_plotly(
metric_names=[m.name for m in map_metrics],
xs_by_metric=xs_by_metric,
ys_by_metric=ys_by_metric,
legend_labels_by_metric=legend_labels_by_metric,
stopping_markers_by_metric=stopping_markers_by_metric,
title=title,
xlabels_by_metric={
m.name: "wall time" if by_walltime else m.map_key_info.key
for m in map_metrics
},
lower_is_better_by_metric={m.name: m.lower_is_better for m in map_metrics},
)
def _merge_trials_dict_with_df(
df: pd.DataFrame,
# pyre-fixme[2]: Parameter annotation cannot contain `Any`.
trials_dict: Dict[int, Any],
column_name: str,
always_include_field_column: bool = False,
) -> None:
"""Add a column ``column_name`` to a DataFrame ``df`` containing a column
``trial_index``. Each value of the new column is given by the element of
``trials_dict`` indexed by ``trial_index``.
Args:
df: Pandas DataFrame with column ``trial_index``, to be appended with a new
column.
trials_dict: Dict mapping each ``trial_index`` to a value. The new column of
df will be populated with the value corresponding with the
``trial_index`` of each row.
column_name: Name of the column to be appended to ``df``.
always_include_field_column: Even if all trials have missing values,
include the column.
"""
if "trial_index" not in df.columns:
raise ValueError("df must have trial_index column")
# field present for some trial
if always_include_field_column or any(trials_dict.values()):
if not all(
v is not None for v in trials_dict.values()
): # not present for all trials
logger.warning(
f"Column {column_name} missing for some trials. "
"Filling with None when missing."
)
df[column_name] = [trials_dict[trial_index] for trial_index in df.trial_index]
else:
logger.warning(
f"Column {column_name} missing for all trials. " "Not appending column."
)
def _get_generation_method_str(trial: BaseTrial) -> str:
trial_generation_property = trial._properties.get("generation_model_key")
if trial_generation_property is not None:
return trial_generation_property
generation_methods = {
not_none(generator_run._model_key)
for generator_run in trial.generator_runs
if generator_run._model_key is not None
}
# add "Manual" if any generator_runs are manual
if any(
generator_run.generator_run_type == GeneratorRunType.MANUAL.name
for generator_run in trial.generator_runs
):
generation_methods.add("Manual")
return ", ".join(generation_methods) if generation_methods else "Unknown"
def _merge_results_if_no_duplicates(
arms_df: pd.DataFrame,
results: pd.DataFrame,
key_components: List[str],
metrics: List[Metric],
) -> DataFrame:
"""Formats ``data.df`` and merges it with ``arms_df`` if all of the following are
True:
- ``data.df`` is not empty
- ``data.df`` contains columns corresponding to ``key_components``
- after any formatting, ``data.df`` contains no duplicates of the column
``results_key_col``
"""
if len(results.index) == 0:
logger.info(
f"No results present for the specified metrics `{metrics}`. "
"Returning arm parameters and metadata only."
)
return arms_df
if not all(col in results.columns for col in key_components):
logger.warning(
f"At least one of key columns `{key_components}` not present in results df "
f"`{results}`. Returning arm parameters and metadata only."
)
return arms_df
# prepare results for merge by concattenating the trial index with the arm name
# sparated by a comma
key_vals = pd.Series(
results[key_components].values.astype("str").tolist()
).str.join(",")
results_key_col = "-".join(key_components)
# Reindex so new column isn't set to NaN.
key_vals.index = results.index
results[results_key_col] = key_vals
# Don't return results if duplicates remain
if any(results.duplicated(subset=[results_key_col, "metric_name"])):
logger.warning(
"Experimental results dataframe contains multiple rows with the same "
f"keys {results_key_col}. Returning dataframe without results."
)
return arms_df
metric_vals = results.pivot(
index=results_key_col, columns="metric_name", values="mean"
).reset_index()
# dedupe results by key_components
metadata_cols = key_components + [results_key_col]
if FEASIBLE_COL_NAME in results.columns:
metadata_cols.append(FEASIBLE_COL_NAME)
metadata = results[metadata_cols].drop_duplicates()
metrics_df = pd.merge(metric_vals, metadata, on=results_key_col)
# drop synthetic key column
metrics_df = metrics_df.drop(results_key_col, axis=1)
# merge and return
return pd.merge(metrics_df, arms_df, on=key_components, how="outer")
[docs]def exp_to_df(
exp: Experiment,
metrics: Optional[List[Metric]] = None,
run_metadata_fields: Optional[List[str]] = None,
trial_properties_fields: Optional[List[str]] = None,
trial_attribute_fields: Optional[List[str]] = None,
additional_fields_callables: Optional[
Dict[str, Callable[[Experiment], Dict[int, Union[str, float]]]]
] = None,
always_include_field_columns: bool = False,
**kwargs: Any,
) -> pd.DataFrame:
"""Transforms an experiment to a DataFrame with rows keyed by trial_index
and arm_name, metrics pivoted into one row. If the pivot results in more than
one row per arm (or one row per ``arm * map_keys`` combination if ``map_keys`` are
present), results are omitted and warning is produced. Only supports
``Experiment``.
Transforms an ``Experiment`` into a ``pd.DataFrame``.
Args:
exp: An ``Experiment`` that may have pending trials.
metrics: Override list of metrics to return. Return all metrics if ``None``.
run_metadata_fields: Fields to extract from ``trial.run_metadata`` for trial
in ``experiment.trials``. If there are multiple arms per trial, these
fields will be replicated across the arms of a trial.
trial_properties_fields: Fields to extract from ``trial._properties`` for trial
in ``experiment.trials``. If there are multiple arms per trial, these
fields will be replicated across the arms of a trial. Output columns names
will be prepended with ``"trial_properties_"``.
trial_attribute_fields: Fields to extract from trial attributes for each trial
in ``experiment.trials``. If there are multiple arms per trial, these
fields will be replicated across the arms of a trial.
additional_fields_callables: A dictionary of field names to callables, with
each being a function from `experiment` to a `trials_dict` of the form
{trial_index: value}. An example of a custom callable like this is the
function `compute_maximum_map_values`.
always_include_field_columns: If `True`, even if all trials have missing
values, include field columns anyway. Such columns are by default
omitted (False).
Returns:
DataFrame: A dataframe of inputs, metadata and metrics by trial and arm (and
``map_keys``, if present). If no trials are available, returns an empty
dataframe. If no metric ouputs are available, returns a dataframe of inputs and
metadata. Columns include:
* trial_index
* arm_name
* trial_status
* generation_method
* any elements of exp.runner.run_metadata_report_keys that are present in
the trial.run_metadata of each trial
* one column per metric (named after the metric.name)
* one column per parameter (named after the parameter.name)
"""
if len(kwargs) > 0:
logger.warning(
"`kwargs` in exp_to_df is deprecated. Please remove extra arguments."
)
# Accept Experiment and SimpleExperiment
if isinstance(exp, MultiTypeExperiment):
raise ValueError("Cannot transform MultiTypeExperiments to DataFrames.")
key_components = ["trial_index", "arm_name"]
# Get each trial-arm with parameters
arms_df = pd.DataFrame(
[
{
"arm_name": arm.name,
"trial_index": trial_index,
**arm.parameters,
}
for trial_index, trial in exp.trials.items()
for arm in trial.arms
]
)
# Fetch results.
data = exp.lookup_data()
results = data.df
# Filter metrics.
if metrics is not None:
metric_names = [m.name for m in metrics]
results = results[results["metric_name"].isin(metric_names)]
# Add `FEASIBLE_COL_NAME` column according to constraints if any.
if (
exp.optimization_config is not None
and len(not_none(exp.optimization_config).all_constraints) > 0
):
optimization_config = not_none(exp.optimization_config)
try:
if any(oc.relative for oc in optimization_config.all_constraints):
optimization_config = _derel_opt_config_wrapper(
optimization_config=optimization_config,
experiment=exp,
)
results[FEASIBLE_COL_NAME] = _is_row_feasible(
df=results,
optimization_config=optimization_config,
)
except (KeyError, ValueError, DataRequiredError) as e:
logger.warning(f"Feasibility calculation failed with error: {e}")
# If arms_df is empty, return empty results (legacy behavior)
if len(arms_df.index) == 0:
if len(results.index) != 0:
raise ValueError(
"exp.lookup_data().df returned more rows than there are experimental "
"arms. This is an inconsistent experimental state. Please report to "
"Ax support."
)
return results
# Create key column from key_components
arms_df["trial_index"] = arms_df["trial_index"].astype(int)
# Add trial status
trials = exp.trials.items()
trial_to_status = {index: trial.status.name for index, trial in trials}
_merge_trials_dict_with_df(
df=arms_df, trials_dict=trial_to_status, column_name="trial_status"
)
# Add trial reason for failed or abandoned trials
trial_to_reason = {
index: (
f"{trial.failed_reason[:15]}..."
if trial.status.is_failed and trial.failed_reason is not None
else (
f"{trial.abandoned_reason[:15]}..."
if trial.status.is_abandoned and trial.abandoned_reason is not None
else None
)
)
for index, trial in trials
}
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_reason,
column_name="reason",
)
# Add generation_method, accounting for the generic case that generator_runs is of
# arbitrary length. Repeated methods within a trial are condensed via `set` and an
# empty set will yield "Unknown" as the method.
trial_to_generation_method = {
trial_index: _get_generation_method_str(trial) for trial_index, trial in trials
}
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_generation_method,
column_name="generation_method",
)
# Add any trial properties fields to arms_df
if trial_properties_fields is not None:
# add trial._properties fields
for field in trial_properties_fields:
trial_to_properties_field = {
trial_index: (
trial._properties[field] if field in trial._properties else None
)
for trial_index, trial in trials
}
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_properties_field,
column_name="trial_properties_" + field,
always_include_field_column=always_include_field_columns,
)
# Add any run_metadata fields to arms_df
if run_metadata_fields is not None:
# add run_metadata fields
for field in run_metadata_fields:
trial_to_metadata_field = {
trial_index: (
trial.run_metadata[field] if field in trial.run_metadata else None
)
for trial_index, trial in trials
}
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_metadata_field,
column_name=field,
always_include_field_column=always_include_field_columns,
)
# Add any trial attributes fields to arms_df
if trial_attribute_fields is not None:
# add trial attribute fields
for field in trial_attribute_fields:
trial_to_attribute_field = {
trial_index: (getattr(trial, field) if hasattr(trial, field) else None)
for trial_index, trial in trials
}
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_attribute_field,
column_name=field,
always_include_field_column=always_include_field_columns,
)
# Add additional fields to arms_df
if additional_fields_callables is not None:
for field, func in additional_fields_callables.items():
trial_to_additional_field = func(exp)
_merge_trials_dict_with_df(
df=arms_df,
trials_dict=trial_to_additional_field,
column_name=field,
always_include_field_column=always_include_field_columns,
)
exp_df = _merge_results_if_no_duplicates(
arms_df=arms_df,
results=results,
key_components=key_components,
metrics=metrics or list(exp.metrics.values()),
)
exp_df = not_none(not_none(exp_df).sort_values(["trial_index"]))
initial_column_order = (
["trial_index", "arm_name", "trial_status", "reason", "generation_method"]
+ (run_metadata_fields or [])
+ (trial_properties_fields or [])
+ ([FEASIBLE_COL_NAME] if FEASIBLE_COL_NAME in exp_df.columns else [])
)
for column_name in reversed(initial_column_order):
if column_name in exp_df.columns:
exp_df.insert(0, column_name, exp_df.pop(column_name))
return exp_df.reset_index(drop=True)
[docs]def compute_maximum_map_values(
experiment: Experiment, map_key: Optional[str] = None
) -> Dict[int, float]:
"""A function that returns a map from trial_index to the maximum map value
reached. If map_key is not specified, it uses the first map_key."""
data = experiment.lookup_data()
if not isinstance(data, MapData):
raise ValueError("`compute_maximum_map_values` requires `MapData`.")
if map_key is None:
map_key = data.map_keys[0]
map_df = data.map_df
maximum_map_value_df = (
map_df[["trial_index"] + data.map_keys]
.groupby("trial_index")
.max()
.reset_index()
)
trials_dict = {}
for trial_index in experiment.trials:
value = None
if trial_index in maximum_map_value_df["trial_index"].values:
value = maximum_map_value_df[
maximum_map_value_df["trial_index"] == trial_index
][map_key].iloc[0]
trials_dict[trial_index] = value
return trials_dict
def _pairwise_pareto_plotly_scatter(
experiment: Experiment,
metric_names: Optional[Tuple[str, str]] = None,
reference_point: Optional[Tuple[float, float]] = None,
minimize: Optional[Union[bool, Tuple[bool, bool]]] = None,
) -> Iterable[go.Figure]:
metric_name_pairs = _get_metric_name_pairs(experiment=experiment)
return [
_pareto_frontier_scatter_2d_plotly(
experiment=experiment,
metric_names=metric_name_pair,
)
for metric_name_pair in metric_name_pairs
]
def _get_metric_name_pairs(
experiment: Experiment, use_first_n_metrics: int = 4
) -> Iterable[Tuple[str, str]]:
optimization_config = _validate_experiment_and_get_optimization_config(
experiment=experiment
)
if not_none(optimization_config).is_moo_problem:
multi_objective = checked_cast(
MultiObjective, not_none(optimization_config).objective
)
metric_names = [obj.metric.name for obj in multi_objective.objectives]
if len(metric_names) > use_first_n_metrics:
logger.warning(
f"Got `metric_names = {metric_names}` of length {len(metric_names)}. "
f"Creating pairwise Pareto plots for the first `use_n_metrics = "
f"{use_first_n_metrics}` of these and disregarding the remainder."
)
metric_names = metric_names[:use_first_n_metrics]
metric_name_pairs = itertools.combinations(metric_names, 2)
return metric_name_pairs
raise UserInputError(
"Inference of `metric_names` failed. Expected `MultiObjective` but "
f"got {not_none(optimization_config).objective}. Please provide an experiment "
"with a MultiObjective `optimization_config`."
)
def _pareto_frontier_scatter_2d_plotly(
experiment: Experiment,
metric_names: Optional[Tuple[str, str]] = None,
reference_point: Optional[Tuple[float, float]] = None,
minimize: Optional[Union[bool, Tuple[bool, bool]]] = None,
) -> go.Figure:
# Determine defaults for unspecified inputs using `optimization_config`
metric_names, reference_point, minimize = _pareto_frontier_plot_input_processing(
experiment=experiment,
metric_names=metric_names,
reference_point=reference_point,
minimize=minimize,
)
return pareto_frontier_scatter_2d_plotly(
experiment, metric_names, reference_point, minimize
)
[docs]def pareto_frontier_scatter_2d_plotly(
experiment: Experiment,
metric_names: Tuple[str, str],
reference_point: Optional[Tuple[float, float]] = None,
minimize: Optional[Union[bool, Tuple[bool, bool]]] = None,
) -> go.Figure:
df = exp_to_df(experiment)
Y = df[list(metric_names)].to_numpy()
Y_pareto = (
_extract_observed_pareto_2d(
Y=Y, reference_point=reference_point, minimize=minimize
)
if minimize is not None
else None
)
hovertext = [f"Arm name: {arm_name}" for arm_name in df["arm_name"]]
return scatter_plot_with_pareto_frontier_plotly(
Y=Y,
Y_pareto=Y_pareto,
metric_x=metric_names[0],
metric_y=metric_names[1],
reference_point=reference_point,
minimize=minimize,
hovertext=hovertext,
)
def _objective_vs_true_objective_scatter(
model: ModelBridge,
objective_metric_name: str,
true_objective_metric_name: str,
) -> go.Figure:
plot = plot_multiple_metrics(
model=model,
metric_x=objective_metric_name,
metric_y=true_objective_metric_name,
rel_x=False,
rel_y=False,
)
fig = go.Figure(plot.data)
fig.layout.title.text = (
f"Objective {objective_metric_name} vs. True Objective "
f"Metric {true_objective_metric_name}"
)
return fig
# TODO: may want to have a way to do this with a plot_fn
# that returns a list of plots, such as get_standard_plots
def _warn_and_create_warning_plot(warning_msg: str) -> go.Figure:
logger.warning(warning_msg)
return (
go.Figure() # pyre-ignore[16]
.add_annotation(text=warning_msg, showarrow=False, font={"size": 20})
.update_xaxes(showgrid=False, showticklabels=False, zeroline=False)
.update_yaxes(showgrid=False, showticklabels=False, zeroline=False)
)
def _format_comparison_string(
comparison_arm_name: str,
baseline_arm_name: str,
objective_name: str,
percent_change: float,
baseline_value: float,
comparison_value: float,
digits: int,
) -> str:
return (
"**Metric "
f"`{objective_name}` improved {percent_change:.{digits}f}%** "
f"from `{baseline_value:.{digits}f}` in arm `'{baseline_arm_name}'` "
f"to `{comparison_value:.{digits}f}` in arm `'{comparison_arm_name}'`.\n "
)
def _construct_comparison_message(
objective_name: str,
objective_minimize: bool,
baseline_arm_name: str,
baseline_value: float,
comparison_arm_name: str,
comparison_value: float,
digits: int = 2,
) -> Optional[str]:
# TODO: allow for user configured digits value
if baseline_value == 0:
logger.info(
"compare_to_baseline: baseline has value of 0"
+ ", can't compute percent change."
)
return None
if (objective_minimize and (baseline_value <= comparison_value)) or (
not objective_minimize and (baseline_value >= comparison_value)
):
logger.debug(
f"compare_to_baseline: comparison arm {comparison_arm_name}"
+ f" did not beat baseline arm {baseline_arm_name}. "
)
return None
percent_change = ((abs(comparison_value - baseline_value)) / baseline_value) * 100
return _format_comparison_string(
comparison_arm_name=comparison_arm_name,
baseline_arm_name=baseline_arm_name,
objective_name=objective_name,
percent_change=percent_change,
baseline_value=baseline_value,
comparison_value=comparison_value,
digits=digits,
)
def _build_result_tuple(
objective_name: str,
objective_minimize: bool,
baseline_arm_name: str,
baseline_value: float,
comparison_row: pd.DataFrame,
) -> Tuple[str, bool, str, float, str, float]:
"""Formats inputs into a tuple for use in creating
the comparison message.
Returns:
(metric_name,
minimize,
baseline_arm_name,
baseline_value,
comparison_arm_name,
comparison_arm_value,)
"""
comparison_arm_name = checked_cast(str, comparison_row["arm_name"])
comparison_value = checked_cast(float, comparison_row[objective_name])
result = (
objective_name,
objective_minimize,
baseline_arm_name,
baseline_value,
comparison_arm_name,
comparison_value,
)
return result
[docs]def select_baseline_arm(
experiment: Experiment, arms_df: pd.DataFrame, baseline_arm_name: Optional[str]
) -> Tuple[str, bool]:
"""
Choose a baseline arm that is found in arms_df
Returns:
Tuple:
baseline_arm_name if valid baseline exists
true when baseline selected from first arm of sweep
raise ValueError if no valid baseline found
"""
if baseline_arm_name:
if arms_df[arms_df["arm_name"] == baseline_arm_name].empty:
raise ValueError(
f"compare_to_baseline: baseline row: {baseline_arm_name=}"
" not found in arms"
)
return baseline_arm_name, False
else:
if (
experiment.status_quo
and not arms_df[
arms_df["arm_name"] == not_none(experiment.status_quo).name
].empty
):
baseline_arm_name = not_none(experiment.status_quo).name
return baseline_arm_name, False
if (
experiment.trials
and experiment.trials[0].arms
and not arms_df[
arms_df["arm_name"] == experiment.trials[0].arms[0].name
].empty
):
baseline_arm_name = experiment.trials[0].arms[0].name
return baseline_arm_name, True
else:
raise ValueError("compare_to_baseline: could not find valid baseline arm")
[docs]def compare_to_baseline_impl(
comparison_list: List[Tuple[str, bool, str, float, str, float]]
) -> Optional[str]:
"""Implementation of compare_to_baseline, taking in a
list of arm comparisons.
Can be used directly with the output of
'maybe_extract_baseline_comparison_values'"""
result_message = ""
if len(comparison_list) > 1:
result_message = (
"Below is the greatest improvement, if any,"
" achieved for each objective metric \n"
)
for _, result_tuple in enumerate(comparison_list):
comparison_message = _construct_comparison_message(*result_tuple)
if comparison_message:
result_message = (
result_message
+ (" \n* " if len(comparison_list) > 1 else "")
+ not_none(comparison_message)
)
return result_message if result_message else None
[docs]def compare_to_baseline(
experiment: Experiment,
optimization_config: Optional[OptimizationConfig],
comparison_arm_names: Optional[List[str]],
baseline_arm_name: Optional[str] = None,
) -> Optional[str]:
"""Calculate metric improvement of the experiment against baseline.
Returns the message(s) added to markdown_messages."""
comparison_list = maybe_extract_baseline_comparison_values(
experiment=experiment,
optimization_config=optimization_config,
comparison_arm_names=comparison_arm_names,
baseline_arm_name=baseline_arm_name,
)
if not comparison_list:
return None
comparison_list = not_none(comparison_list)
return compare_to_baseline_impl(comparison_list)
[docs]def warn_if_unpredictable_metrics(
experiment: Experiment,
generation_strategy: GenerationStrategy,
model_fit_threshold: float,
metric_names: Optional[List[str]] = None,
model_fit_metric_name: str = "coefficient_of_determination",
) -> Optional[str]:
"""Warn if any optimization config metrics are considered unpredictable,
i.e., their coefficient of determination is less than model_fit_threshold.
Args:
experiment: The experiment containing the data and optimization_config.
If there is no optimization config, this function checks all metrics
attached to the experiment.
generation_strategy: The generation strategy containing the model.
model_fit_threshold: If a model's coefficient of determination is below
this threshold, that metric is considered unpredictable.
metric_names: If specified, only check these metrics.
model_fit_metric_name: Name of the metric to apply the model fit threshold to.
Returns:
A string warning the user about unpredictable metrics, if applicable.
"""
# Get fit quality dict.
model_bridge = generation_strategy.model # Optional[ModelBridge]
if model_bridge is None: # Need to re-fit the model.
generation_strategy._fit_current_model(data=None)
model_bridge = cast(ModelBridge, generation_strategy.model)
if isinstance(model_bridge, RandomModelBridge):
logger.debug(
"Current modelbridge on GenerationStrategy is RandomModelBridge. "
"Not checking metric predictability."
)
return None
model_fit_dict = compute_model_fit_metrics_from_modelbridge(
model_bridge=model_bridge,
generalization=True, # use generalization metrics for user warning
untransform=False,
)
fit_quality_dict = model_fit_dict[model_fit_metric_name]
# Extract salient metrics from experiment.
if metric_names is None:
if experiment.optimization_config is None:
metric_names = list(experiment.metrics.keys())
else:
metric_names = list(not_none(experiment.optimization_config).metrics.keys())
else:
# Raise a ValueError if any metric names are invalid.
bad_metric_names = set(metric_names) - set(experiment.metrics.keys())
if len(bad_metric_names) > 0:
raise ValueError(
f"Invalid metric names: {bad_metric_names}. Please only use "
"metric_names that are available on the present experiment, "
f"which are: {list(experiment.metrics.keys())}."
)
# Flag metrics whose coefficient of determination is below the threshold.
unpredictable_metrics = {
k: v
for k, v in fit_quality_dict.items()
if k in metric_names and v < model_fit_threshold
}
if len(unpredictable_metrics) > 0:
return UNPREDICTABLE_METRICS_MESSAGE.format(list(unpredictable_metrics.keys()))
