private static IDataView AppendLabelTransform(IHostEnvironment env, IChannel ch, IDataView input, string labelName, int labelPermutationSeed)
{
Contracts.AssertValue(env);
env.AssertValue(ch);
ch.AssertValue(input);
ch.AssertNonWhiteSpace(labelName);
var col = input.Schema.GetColumnOrNull(labelName);
if (!col.HasValue)
{
throw ch.ExceptSchemaMismatch(nameof(input), "Label", labelName);
}
ColumnType labelType = col.Value.Type;
if (!labelType.IsKey)
{
if (labelPermutationSeed != 0)
{
ch.Warning(
"labelPermutationSeed != 0 only applies on a multi-class learning problem when the label type is a key.");
}
return(input);
}
return(Utils.MarshalInvoke(AppendFloatMapper <int>, labelType.RawType, env, ch, input, labelName, (KeyType)labelType,
labelPermutationSeed));
}
private static IDataView AppendLabelTransform(IHostEnvironment env, IChannel ch, IDataView input, string labelName, int labelPermutationSeed)
{
Contracts.AssertValue(env);
env.AssertValue(ch);
ch.AssertValue(input);
ch.AssertNonWhiteSpace(labelName);
int col;
if (!input.Schema.TryGetColumnIndex(labelName, out col))
{
throw ch.Except("Label column '{0}' not found.", labelName);
}
ColumnType labelType = input.Schema[col].Type;
if (!labelType.IsKey)
{
if (labelPermutationSeed != 0)
{
ch.Warning(
"labelPermutationSeed != 0 only applies on a multi-class learning problem when the label type is a key.");
}
return(input);
}
return(Utils.MarshalInvoke(AppendFloatMapper <int>, labelType.RawType, env, ch, input, labelName, (KeyType)labelType,
labelPermutationSeed));
}