binary_classification_pipeline¶
Pipeline subclass for all binary classification pipelines.
Module Contents¶
Classes Summary¶
Pipeline subclass for all binary classification pipelines. |
Contents¶
-
class
evalml.pipelines.binary_classification_pipeline.
BinaryClassificationPipeline
(component_graph, parameters=None, custom_name=None, random_seed=0)[source]¶ Pipeline subclass for all binary classification pipelines.
- Parameters
component_graph (ComponentGraph, list, dict) – ComponentGraph instance, list of components in order, or dictionary of components. Accepts strings or ComponentBase subclasses in the list. Note that when duplicate components are specified in a list, the duplicate component names will be modified with the component’s index in the list. For example, the component graph [Imputer, One Hot Encoder, Imputer, Logistic Regression Classifier] will have names [“Imputer”, “One Hot Encoder”, “Imputer_2”, “Logistic Regression Classifier”]
parameters (dict) – Dictionary with component names as keys and dictionary of that component’s parameters as values. An empty dictionary or None implies using all default values for component parameters. Defaults to None.
custom_name (str) – Custom name for the pipeline. Defaults to None.
random_seed (int) – Seed for the random number generator. Defaults to 0.
Attributes
problem_type
ProblemTypes.BINARY
Methods
Determine whether the threshold of a binary classification pipeline can be tuned.
Gets the class names for the pipeline. Will return None before pipeline is fit.
Constructs a new pipeline with the same components, parameters, and random seed.
Create objective instances from a list of strings or objective classes.
Custom name of the pipeline.
Outputs pipeline details including component parameters.
Importance associated with each feature. Features dropped by the feature selection are excluded.
Build a classification model. For string and categorical targets, classes are sorted by sorted(set(y)) and then are mapped to values between 0 and n_classes-1.
Returns component by name.
Returns hyperparameter ranges from all components as a dictionary.
Generate an image representing the pipeline graph.
Generate a bar graph of the pipeline’s feature importance.
Generates a JSON with nodes consisting of the component names and parameters, and edges detailing component relationships.
Apply component inverse_transform methods to estimator predictions in reverse order.
Loads pipeline at file path.
Returns model family of this pipeline.
Name of the pipeline.
Constructs a new instance of the pipeline with the same component graph but with a different set of parameters. Not to be confused with python’s __new__ method.
Optimize the pipeline threshold given the objective to use. Only used for binary problems with objectives whose thresholds can be tuned.
Parameter dictionary for this pipeline.
Make predictions using selected features.
Make probability estimates for labels. Assumes that the column at index 1 represents the positive label case.
Saves pipeline at file path.
Evaluate model performance on objectives.
A short summary of the pipeline structure, describing the list of components used.
Threshold used to make a prediction. Defaults to None.
Transform the input.
Transforms the data by applying all pre-processing components.
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can_tune_threshold_with_objective
(self, objective)¶ Determine whether the threshold of a binary classification pipeline can be tuned.
- Parameters
objective (ObjectiveBase) – Primary AutoMLSearch objective.
- Returns
True if the pipeline threshold can be tuned.
- Return type
bool
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property
classes_
(self)¶ Gets the class names for the pipeline. Will return None before pipeline is fit.
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clone
(self)¶ Constructs a new pipeline with the same components, parameters, and random seed.
- Returns
A new instance of this pipeline with identical components, parameters, and random seed.
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static
create_objectives
(objectives)¶ Create objective instances from a list of strings or objective classes.
-
property
custom_name
(self)¶ Custom name of the pipeline.
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describe
(self, return_dict=False)¶ Outputs pipeline details including component parameters.
- Parameters
return_dict (bool) – If True, return dictionary of information about pipeline. Defaults to False.
- Returns
Dictionary of all component parameters if return_dict is True, else None.
- Return type
dict
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property
feature_importance
(self)¶ Importance associated with each feature. Features dropped by the feature selection are excluded.
- Returns
Feature names and their corresponding importance
- Return type
pd.DataFrame
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fit
(self, X, y)¶ Build a classification model. For string and categorical targets, classes are sorted by sorted(set(y)) and then are mapped to values between 0 and n_classes-1.
- Parameters
X (pd.DataFrame or np.ndarray) – The input training data of shape [n_samples, n_features]
y (pd.Series, np.ndarray) – The target training labels of length [n_samples]
- Returns
self
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get_component
(self, name)¶ Returns component by name.
- Parameters
name (str) – Name of component.
- Returns
Component to return
- Return type
Component
-
get_hyperparameter_ranges
(self, custom_hyperparameters)¶ Returns hyperparameter ranges from all components as a dictionary.
- Parameters
custom_hyperparameters (dict) – Custom hyperparameters for the pipeline.
- Returns
Dictionary of hyperparameter ranges for each component in the pipeline.
- Return type
dict
-
graph
(self, filepath=None)¶ Generate an image representing the pipeline graph.
- Parameters
filepath (str, optional) – Path to where the graph should be saved. If set to None (as by default), the graph will not be saved.
- Returns
Graph object that can be directly displayed in Jupyter notebooks.
- Return type
graphviz.Digraph
- Raises
RuntimeError – If graphviz is not installed.
ValueError – If path is not writeable.
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graph_feature_importance
(self, importance_threshold=0)¶ Generate a bar graph of the pipeline’s feature importance.
- Parameters
importance_threshold (float, optional) – If provided, graph features with a permutation importance whose absolute value is larger than importance_threshold. Defaults to zero.
- Returns
A bar graph showing features and their corresponding importance.
- Return type
plotly.Figure
- Raises
ValueError – If importance threshold is not valid.
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graph_json
(self)¶ Generates a JSON with nodes consisting of the component names and parameters, and edges detailing component relationships.
x_edges specifies from which component feature data is being passed. y_edges specifies from which component target data is being passed. This can be used to build graphs across a variety of visualization tools. Template: {“Nodes”: {“component_name”: {“Name”: class_name, “Attributes”: parameters_attributes}, …}}, “x_edges”: [[from_component_name, to_component_name], [from_component_name, to_component_name], …], “y_edges”: [[from_component_name, to_component_name], [from_component_name, to_component_name], …]}
- Returns
A serialized JSON representation of a DAG structure.
- Return type
dag_json (str)
-
inverse_transform
(self, y)¶ Apply component inverse_transform methods to estimator predictions in reverse order.
Components that implement inverse_transform are PolynomialDetrender, LogTransformer, LabelEncoder (tbd).
- Parameters
y (pd.Series) – Final component features.
- Returns
The inverse transform of the target.
- Return type
pd.Series
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static
load
(file_path)¶ Loads pipeline at file path.
- Parameters
file_path (str) – Location to load file.
- Returns
PipelineBase object
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property
model_family
(self)¶ Returns model family of this pipeline.
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property
name
(self)¶ Name of the pipeline.
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new
(self, parameters, random_seed=0)¶ Constructs a new instance of the pipeline with the same component graph but with a different set of parameters. Not to be confused with python’s __new__ method.
- Parameters
parameters (dict) – Dictionary with component names as keys and dictionary of that component’s parameters as values. An empty dictionary or None implies using all default values for component parameters. Defaults to None.
random_seed (int) – Seed for the random number generator. Defaults to 0.
- Returns
A new instance of this pipeline with identical components.
-
optimize_threshold
(self, X, y, y_pred_proba, objective)¶ Optimize the pipeline threshold given the objective to use. Only used for binary problems with objectives whose thresholds can be tuned.
- Parameters
X (pd.DataFrame) – Input features.
y (pd.Series) – Input target values.
y_pred_proba (pd.Series) – The predicted probabilities of the target outputted by the pipeline.
objective (ObjectiveBase) – The objective to threshold with. Must have a tunable threshold.
- Raises
ValueError – If objective is not optimizable.
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property
parameters
(self)¶ Parameter dictionary for this pipeline.
- Returns
Dictionary of all component parameters.
- Return type
dict
-
predict
(self, X, objective=None, X_train=None, y_train=None)¶ Make predictions using selected features.
Note: we cast y as ints first to address boolean values that may be returned from calculating predictions which we would not be able to otherwise transform if we originally had integer targets.
- Parameters
X (pd.DataFrame) – Data of shape [n_samples, n_features].
objective (Object or string) – The objective to use to make predictions.
X_train (pd.DataFrame) – Training data. Ignored. Only used for time series.
y_train (pd.Series) – Training labels. Ignored. Only used for time series.
- Returns
Estimated labels.
- Return type
pd.Series
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predict_proba
(self, X, X_train=None, y_train=None)[source]¶ Make probability estimates for labels. Assumes that the column at index 1 represents the positive label case.
- Parameters
X (pd.DataFrame or np.ndarray) – Data of shape [n_samples, n_features]
X_train (pd.DataFrame or np.ndarray or None) – Training data. Ignored. Only used for time series.
y_train (pd.Series or None) – Training labels. Ignored. Only used for time series.
- Returns
Probability estimates
- Return type
pd.Series
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save
(self, file_path, pickle_protocol=cloudpickle.DEFAULT_PROTOCOL)¶ Saves pipeline at file path.
- Parameters
file_path (str) – Location to save file.
pickle_protocol (int) – The pickle data stream format.
-
score
(self, X, y, objectives, X_train=None, y_train=None)¶ Evaluate model performance on objectives.
- Parameters
X (pd.DataFrame) – Data of shape [n_samples, n_features]
y (pd.Series) – True labels of length [n_samples]
objectives (list) – List of objectives to score
X_train (pd.DataFrame) – Training data. Ignored. Only used for time series.
y_train (pd.Series) – Training labels. Ignored. Only used for time series.
- Returns
Ordered dictionary of objective scores.
- Return type
dict
-
property
summary
(self)¶ A short summary of the pipeline structure, describing the list of components used.
Example: Logistic Regression Classifier w/ Simple Imputer + One Hot Encoder
- Returns
A string describing the pipeline structure.
-
property
threshold
(self)¶ Threshold used to make a prediction. Defaults to None.
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transform
(self, X, y=None)¶ Transform the input.
- Parameters
X (pd.DataFrame, or np.ndarray) – Data of shape [n_samples, n_features].
y (pd.Series) – The target data of length [n_samples]. Defaults to None.
- Returns
Transformed output.
- Return type
pd.DataFrame
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transform_all_but_final
(self, X, y=None, X_train=None, y_train=None)¶ Transforms the data by applying all pre-processing components.
- Parameters
X (pd.DataFrame) – Input data to the pipeline to transform.
y (pd.Series or None) – Targets corresponding to X. Optional.
X_train (pd.DataFrame or np.ndarray or None) – Training data. Only used for time series.
y_train (pd.Series or None) – Training labels. Only used for time series.
- Returns
New transformed features.
- Return type
pd.DataFrame