Docstring:
Usage: qiime sample-classifier classify-samples-ncv [OPTIONS]
Predicts a categorical sample metadata column using a supervised learning
classifier. Uses nested stratified k-fold cross validation for automated
hyperparameter optimization and sample prediction. Outputs predicted values
for each input sample, and relative importance of each feature for model
accuracy.
Inputs:
--i-table ARTIFACT FeatureTable[Frequency | RelativeFrequency |
PresenceAbsence | Composition]
Feature table containing all features that should be
used for target prediction. [required]
Parameters:
--m-metadata-file METADATA
--m-metadata-column COLUMN MetadataColumn[Categorical]
Categorical metadata column to use as prediction
target. [required]
--p-cv INTEGER Number of k-fold cross-validations to perform.
Range(1, None) [default: 5]
--p-random-state INTEGER
Seed used by random number generator. [optional]
--p-n-jobs NTHREADS Number of jobs to run in parallel. [default: 1]
--p-n-estimators INTEGER
Range(1, None) Number of trees to grow for estimation. More trees
will improve predictive accuracy up to a threshold
level, but will also increase time and memory
requirements. This parameter only affects ensemble
estimators, such as Random Forest, AdaBoost,
ExtraTrees, and GradientBoosting. [default: 100]
--p-estimator TEXT Choices('RandomForestClassifier',
'ExtraTreesClassifier', 'GradientBoostingClassifier',
'AdaBoostClassifier[DecisionTree]', 'AdaBoostClassifier[ExtraTrees]',
'KNeighborsClassifier', 'LinearSVC', 'SVC')
Estimator method to use for sample prediction.
[default: 'RandomForestClassifier']
--p-parameter-tuning / --p-no-parameter-tuning
Automatically tune hyperparameters using random grid
search. [default: False]
--p-missing-samples TEXT Choices('error', 'ignore')
How to handle missing samples in metadata. "error"
will fail if missing samples are detected. "ignore"
will cause the feature table and metadata to be
filtered, so that only samples found in both files are
retained. [default: 'error']
Outputs:
--o-predictions ARTIFACT SampleData[ClassifierPredictions]
Predicted target values for each input sample.
[required]
--o-feature-importance ARTIFACT FeatureData[Importance]
Importance of each input feature to model accuracy.
[required]
--o-probabilities ARTIFACT SampleData[Probabilities]
Predicted class probabilities for each input sample.
[required]
Miscellaneous:
--output-dir PATH Output unspecified results to a directory
--verbose / --quiet Display verbose output to stdout and/or stderr during
execution of this action. Or silence output if
execution is successful (silence is golden).
--example-data PATH Write example data and exit.
--citations Show citations and exit.
--help Show this message and exit.
Import:
from qiime2.plugins.sample_classifier.methods import classify_samples_ncv
Docstring:
Nested cross-validated supervised learning classifier.
Predicts a categorical sample metadata column using a supervised learning
classifier. Uses nested stratified k-fold cross validation for automated
hyperparameter optimization and sample prediction. Outputs predicted values
for each input sample, and relative importance of each feature for model
accuracy.
Parameters
----------
table : FeatureTable[Frequency | RelativeFrequency | PresenceAbsence | Composition]
Feature table containing all features that should be used for target
prediction.
metadata : MetadataColumn[Categorical]
Categorical metadata column to use as prediction target.
cv : Int % Range(1, None), optional
Number of k-fold cross-validations to perform.
random_state : Int, optional
Seed used by random number generator.
n_jobs : Threads, optional
Number of jobs to run in parallel.
n_estimators : Int % Range(1, None), optional
Number of trees to grow for estimation. More trees will improve
predictive accuracy up to a threshold level, but will also increase
time and memory requirements. This parameter only affects ensemble
estimators, such as Random Forest, AdaBoost, ExtraTrees, and
GradientBoosting.
estimator : Str % Choices('RandomForestClassifier', 'ExtraTreesClassifier', 'GradientBoostingClassifier', 'AdaBoostClassifier[DecisionTree]', 'AdaBoostClassifier[ExtraTrees]', 'KNeighborsClassifier', 'LinearSVC', 'SVC'), optional
Estimator method to use for sample prediction.
parameter_tuning : Bool, optional
Automatically tune hyperparameters using random grid search.
missing_samples : Str % Choices('error', 'ignore'), optional
How to handle missing samples in metadata. "error" will fail if missing
samples are detected. "ignore" will cause the feature table and
metadata to be filtered, so that only samples found in both files are
retained.
Returns
-------
predictions : SampleData[ClassifierPredictions]
Predicted target values for each input sample.
feature_importance : FeatureData[Importance]
Importance of each input feature to model accuracy.
probabilities : SampleData[Probabilities]
Predicted class probabilities for each input sample.
