public static CommonOutputs.TransformOutput PrepareRegressionLabel(IHostEnvironment env, RegressionLabelInput input)
{
Contracts.CheckValue(env, nameof(env));
var host = env.Register("PrepareRegressionLabel");
host.CheckValue(input, nameof(input));
EntryPointUtils.CheckInputArgs(host, input);
var labelCol = input.Data.Schema.GetColumnOrNull(input.LabelColumn);
if (!labelCol.HasValue)
{
throw host.Except($"Column '{input.LabelColumn}' not found.");
}
var labelType = labelCol.Value.Type;
if (labelType == NumberDataViewType.Single || !(labelType is NumberDataViewType))
{
var nop = NopTransform.CreateIfNeeded(env, input.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, nop, input.Data), OutputData = nop
});
}
var xf = new TypeConvertingTransformer(host, new TypeConvertingEstimator.ColumnOptions(input.LabelColumn, DataKind.Single, input.LabelColumn)).Transform(input.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, xf, input.Data), OutputData = xf
});
}
public static CommonOutputs.TransformOutput PrepareRegressionLabel(IHostEnvironment env, RegressionLabelInput input)
{
Contracts.CheckValue(env, nameof(env));
var host = env.Register("PrepareRegressionLabel");
host.CheckValue(input, nameof(input));
EntryPointUtils.CheckInputArgs(host, input);
int labelCol;
if (!input.Data.Schema.TryGetColumnIndex(input.LabelColumn, out labelCol))
{
throw host.Except($"Column '{input.LabelColumn}' not found.");
}
var labelType = input.Data.Schema[labelCol].Type;
if (labelType == NumberType.R4 || !labelType.IsNumber)
{
var nop = NopTransform.CreateIfNeeded(env, input.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, nop, input.Data), OutputData = nop
});
}
var args = new TypeConvertingTransformer.Arguments()
{
Column = new[]
{
new TypeConvertingTransformer.Column()
{
Name = input.LabelColumn,
Source = input.LabelColumn,
ResultType = DataKind.R4
}
}
};
var xf = new TypeConvertingTransformer(host, new TypeConvertingTransformer.ColumnInfo(input.LabelColumn, input.LabelColumn, DataKind.R4)).Transform(input.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, xf, input.Data), OutputData = xf
});
}