public static CommonOutputs.TransformOutput ConcatColumns(IHostEnvironment env, ColumnCopyingTransformer.Options input)
{
Contracts.CheckValue(env, nameof(env));
var host = env.Register("PrefixConcatColumns");
host.CheckValue(input, nameof(input));
EntryPointUtils.CheckInputArgs(host, input);
// Get all column names with preserving order.
var colNames = new List <string>(input.Data.Schema.Count);
for (int i = 0; i < input.Data.Schema.Count; i++)
{
colNames.Add(input.Data.Schema[i].Name);
}
// Iterate through input options, find matching source columns, create new input options
var inputOptions = new ColumnConcatenatingTransformer.Options()
{
Data = input.Data
};
var columns = new List <ColumnConcatenatingTransformer.Column>(input.Columns.Length);
foreach (var col in input.Columns)
{
var newCol = new ColumnConcatenatingTransformer.Column();
newCol.Name = col.Name;
var prefix = col.Source;
newCol.Source = colNames.Where(x => x.StartsWith(prefix, StringComparison.InvariantCulture)).ToArray();
if (newCol.Source.Length == 0)
{
throw new ArgumentOutOfRangeException("No matching columns found for prefix: " + prefix);
}
columns.Add(newCol);
}
inputOptions.Columns = columns.ToArray();
var xf = ColumnConcatenatingTransformer.Create(env, inputOptions, inputOptions.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, xf, inputOptions.Data), OutputData = xf
});
}
public static CommonOutputs.TransformOutput ConcatColumns(IHostEnvironment env, ColumnConcatenatingTransformer.Options input)
{
Contracts.CheckValue(env, nameof(env));
var host = env.Register("ConcatColumns");
host.CheckValue(input, nameof(input));
EntryPointUtils.CheckInputArgs(host, input);
var xf = ColumnConcatenatingTransformer.Create(env, input, input.Data);
return(new CommonOutputs.TransformOutput {
Model = new TransformModelImpl(env, xf, input.Data), OutputData = xf
});
}
