regress-samples: Train and test a cross-validated supervised learning regressor.¶

Docstring:

Usage: qiime sample-classifier regress-samples [OPTIONS]

  Predicts a continuous sample metadata column using a supervised learning
  regressor. Splits input data into training and test sets. The training set
  is used to train and test the estimator using a stratified k-fold cross-
  validation scheme. This includes optional steps for automated feature
  extraction and hyperparameter optimization. The test set validates
  classification accuracy of the optimized estimator. Outputs classification
  results for test set. For more details on the learning algorithm, see
  http://scikit-learn.org/stable/supervised_learning.html

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[Numeric]
                          Numeric metadata column to use as prediction
                          target.                                   [required]
  --p-test-size PROPORTION
    Range(0.0, 1.0)       Fraction of input samples to exclude from training
                          set and use for classifier testing.   [default: 0.2]
  --p-step PROPORTION Range(0.0, 1.0, inclusive_start=False)
                          If optimize-feature-selection is True, step is the
                          percentage of features to remove at each iteration.
                                                               [default: 0.05]
  --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('RandomForestRegressor',
    'ExtraTreesRegressor', 'GradientBoostingRegressor',
    'AdaBoostRegressor[DecisionTree]', 'AdaBoostRegressor[ExtraTrees]',
    'ElasticNet', 'Ridge', 'Lasso', 'KNeighborsRegressor', 'LinearSVR', 'SVR')
                          Estimator method to use for sample prediction.
                                            [default: 'RandomForestRegressor']
  --p-optimize-feature-selection / --p-no-optimize-feature-selection
                          Automatically optimize input feature selection
                          using recursive feature elimination.
                                                              [default: False]
  --p-stratify / --p-no-stratify
                          Evenly stratify training and test data among
                          metadata categories. If True, all values in column
                          must match at least two samples.    [default: False]
  --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-sample-estimator ARTIFACT SampleEstimator[Regressor]
                          Trained sample estimator.                 [required]
  --o-feature-importance ARTIFACT FeatureData[Importance]
                          Importance of each input feature to model accuracy.
                                                                    [required]
  --o-predictions ARTIFACT SampleData[RegressorPredictions]
                          Predicted target values for each input sample.
                                                                    [required]
  --o-model-summary VISUALIZATION
                          Summarized parameter and (if enabled) feature
                          selection information for the trained estimator.
                                                                    [required]
  --o-accuracy-results VISUALIZATION
                          Accuracy results visualization.           [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).
  --recycle-pool TEXT     Use a cache pool for pipeline resumption. QIIME 2
                          will cache your results in this pool for reuse by
                          future invocations. These pool are retained until
                          deleted by the user. If not provided, QIIME 2 will
                          create a pool which is automatically reused by
                          invocations of the same action and removed if the
                          action is successful. Note: these pools are local to
                          the cache you are using.
  --no-recycle            Do not recycle results from a previous failed
                          pipeline run or save the results from this run for
                          future recycling.
  --parallel              Execute your action in parallel. This flag will use
                          your default parallel config.
  --parallel-config FILE  Execute your action in parallel using a config at
                          the indicated path.
  --example-data PATH     Write example data and exit.
  --citations             Show citations and exit.
  --use-cache DIRECTORY   Specify the cache to be used for the intermediate
                          work of this action. If not provided, the default
                          cache under $TMP/qiime2/ will be used.
                          IMPORTANT FOR HPC USERS: If you are on an HPC system
                          and are using parallel execution it is important to
                          set this to a location that is globally accessible
                          to all nodes in the cluster.
  --help                  Show this message and exit.