public static IColumnFunctionBuilder CreateBuilder(LogMeanVarArguments args, IHost host,
int icol, int srcIndex, ColumnType srcType, IRowCursor cursor)
{
Contracts.AssertValue(host);
host.AssertValue(args);
if (srcType.IsNumber)
{
if (srcType == NumberType.R4)
{
return(Sng.MeanVarOneColumnFunctionBuilder.Create(args, host, icol, srcType, cursor.GetGetter <Single>(srcIndex)));
}
if (srcType == NumberType.R8)
{
return(Dbl.MeanVarOneColumnFunctionBuilder.Create(args, host, icol, srcType, cursor.GetGetter <Double>(srcIndex)));
}
}
if (srcType.IsVector && srcType.ItemType.IsNumber)
{
if (srcType.ItemType == NumberType.R4)
{
return(Sng.MeanVarVecColumnFunctionBuilder.Create(args, host, icol, srcType, cursor.GetGetter <VBuffer <Single> >(srcIndex)));
}
if (srcType.ItemType == NumberType.R8)
{
return(Dbl.MeanVarVecColumnFunctionBuilder.Create(args, host, icol, srcType, cursor.GetGetter <VBuffer <Double> >(srcIndex)));
}
}
throw host.ExceptUserArg(nameof(args.Column), "Wrong column type for column {0}. Expected: R4, R8, Vec<R4, n> or Vec<R8, n>. Got: {1}.", args.Column[icol].Source, srcType.ToString());
}
/// <summary>
/// Public create method corresponding to SignatureDataTransform.
/// </summary>
public static NormalizeTransform Create(IHostEnvironment env, LogMeanVarArguments args, IDataView input)
{
Contracts.CheckValue(env, nameof(env));
var h = env.Register("Normalize(LogMeanVar)");
NormalizeTransform func;
using (var ch = h.Start("Training"))
{
func = Create(h, args, input, LogMeanVarUtils.CreateBuilder);
ch.Done();
}
return(func);
}
