LightGbmBinaryTrainer Class
Definition
Important
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The IEstimator<TTransformer> for training a boosted decision tree binary classification model using LightGBM.
public sealed class LightGbmBinaryTrainer : Microsoft.ML.Trainers.LightGbm.LightGbmTrainerBase<Microsoft.ML.Trainers.LightGbm.LightGbmBinaryTrainer.Options,float,Microsoft.ML.Data.BinaryPredictionTransformer<Microsoft.ML.Calibrators.CalibratedModelParametersBase<Microsoft.ML.Trainers.LightGbm.LightGbmBinaryModelParameters,Microsoft.ML.Calibrators.PlattCalibrator>>,Microsoft.ML.Calibrators.CalibratedModelParametersBase<Microsoft.ML.Trainers.LightGbm.LightGbmBinaryModelParameters,Microsoft.ML.Calibrators.PlattCalibrator>>type LightGbmBinaryTrainer = class
inherit LightGbmTrainerBase<LightGbmBinaryTrainer.Options, single, BinaryPredictionTransformer<CalibratedModelParametersBase<LightGbmBinaryModelParameters, PlattCalibrator>>, CalibratedModelParametersBase<LightGbmBinaryModelParameters, PlattCalibrator>>Public NotInheritable Class LightGbmBinaryTrainer
Inherits LightGbmTrainerBase(Of LightGbmBinaryTrainer.Options, Single, BinaryPredictionTransformer(Of CalibratedModelParametersBase(Of LightGbmBinaryModelParameters, PlattCalibrator)), CalibratedModelParametersBase(Of LightGbmBinaryModelParameters, PlattCalibrator))- Inheritance
Remarks
To create this trainer, use LightGbm or LightGbm(Options).
Input and Output Columns
The input label column data must be Boolean. The input features column data must be a known-sized vector of Single.
This trainer outputs the following columns:
| Output Column Name | Column Type | Description | |
|---|---|---|---|
Score |
Single | The unbounded score that was calculated by the model. | |
PredictedLabel |
Boolean | The predicted label, based on the sign of the score. A negative score maps to false and a positive score maps to true. |
|
Probability |
Single | The probability calculated by calibrating the score of having true as the label. Probability value is in range [0, 1]. |
Trainer Characteristics
| Machine learning task | Binary classification |
| Is normalization required? | No |
| Is caching required? | No |
| Required NuGet in addition to Microsoft.ML | Microsoft.ML.LightGbm |
| Exportable to ONNX | Yes |
Training Algorithm Details
LightGBM is an open source implementation of gradient boosting decision tree. For implementation details, please see LightGBM's official documentation or this paper.
Check the See Also section for links to examples of the usage.
Fields
| FeatureColumn |
The feature column that the trainer expects. (Inherited from TrainerEstimatorBase<TTransformer,TModel>) |
| GroupIdColumn |
The optional groupID column that the ranking trainers expects. (Inherited from TrainerEstimatorBaseWithGroupId<TTransformer,TModel>) |
| LabelColumn |
The label column that the trainer expects. Can be |
| WeightColumn |
The weight column that the trainer expects. Can be |
Properties
| Info | (Inherited from LightGbmTrainerBase<TOptions,TOutput,TTransformer,TModel>) |
Methods
| Fit(IDataView, IDataView) |
Trains a LightGbmBinaryTrainer using both training and validation data, returns a BinaryPredictionTransformer<TModel>. |
| Fit(IDataView) |
Trains and returns a ITransformer. (Inherited from TrainerEstimatorBase<TTransformer,TModel>) |
| GetOutputSchema(SchemaShape) | (Inherited from TrainerEstimatorBase<TTransformer,TModel>) |
Extension Methods
| AppendCacheCheckpoint<TTrans>(IEstimator<TTrans>, IHostEnvironment) |
Append a 'caching checkpoint' to the estimator chain. This will ensure that the downstream estimators will be trained against cached data. It is helpful to have a caching checkpoint before trainers that take multiple data passes. |
| WithOnFitDelegate<TTransformer>(IEstimator<TTransformer>, Action<TTransformer>) |
Given an estimator, return a wrapping object that will call a delegate once Fit(IDataView) is called. It is often important for an estimator to return information about what was fit, which is why the Fit(IDataView) method returns a specifically typed object, rather than just a general ITransformer. However, at the same time, IEstimator<TTransformer> are often formed into pipelines with many objects, so we may need to build a chain of estimators via EstimatorChain<TLastTransformer> where the estimator for which we want to get the transformer is buried somewhere in this chain. For that scenario, we can through this method attach a delegate that will be called once fit is called. |