# Classification Usage Model¶

A typical workflow for classification methods includes training and prediction, as explained below.

## Algorithm-Specific Parameters¶

The parameters used by classification algorithms at each stage depend on a specific algorithm. For a list of these parameters, refer to the description of an appropriate classification algorithm.

## Training Stage¶

At the training stage, classification algorithms accept the input described below. Pass the Input ID as a parameter to the methods that provide input for your algorithm. For more details, see Algorithms.

Training Input for Classification Algorithms

Input ID

Input

data

Pointer to the $$n \times p$$ numeric table with the training data set. This table can be an object of any class derived from NumericTable.

weights

Weights of the observations in the training data set. Argument is optional, but it is required by the selected algorithms.

labels

Pointer to the $$n \times 1$$ numeric table with class labels.

This table can be an object of any class derived from NumericTable except PackedSymmetricMatrix and PackedTriangularMatrix.

At the training stage, classification algorithms calculate the result described below. Pass the Result ID as a parameter to the methods that access the results of your algorithm. For more details, see Algorithms.

Training Output for Classification Algorithms

Result ID

Result

model

Pointer to the classification model being trained. The result can only be an object of the Model class.

## Prediction Stage¶

At the prediction stage, classification algorithms accept the input described below. Pass the Input ID as a parameter to the methods that provide input for your algorithm. For more details, see Algorithms.

Prediction Input for Classification Algorithms

Input ID

Input

data

Pointer to the $$n \times p$$ numeric table with the working data set. This table can be an object of any class derived from NumericTable.

model

Pointer to the trained classification model. This input can only be an object of the Model class.

At the prediction stage, classification algorithms calculate the result described below. Pass the Result ID as a parameter to the methods that access the results of your algorithm. For more details, see Algorithms.

Prediction Output for Classification Algorithms

Result ID

Result

prediction

Pointer to the $$n \times 1$$ numeric table with classification results (class labels or confidence levels).

Note

By default, this table is an object of the HomogenNumericTable class, but you can define it as an object of any class derived from NumericTable except PackedSymmetricMatrix and PackedTriangularMatrix.

probabilities

A numeric table of size $$n \times \text{nClasses}$$, containing probabilities of classes computed when the computeClassProbabilities option is enabled. This result table is available for selected algorithms, see corresponding algorithm documentation for details.

logProbabilities

A numeric table of size $$n \times \text{nClasses}$$, containing logarithms of classes’ probabilities computed when the computeClassLogProbabilities option is enabled. This result table is available for selected algorithms, see corresponding algorithm documentation for details.

Note

By default, this table is an object of the HomogenNumericTable class, but you can define it as an object of any class derived from NumericTable except PackedSymmetricMatrix, PackedTriangularMatrix, CSRNumericTable.