/// <summary>
/// Read a data view from a text file using <see cref="TextLoader"/>.
/// </summary>
/// <param name="catalog">The catalog.</param>
/// <param name="columns">The columns of the schema.</param>
/// <param name="advancedSettings">The delegate to set additional settings</param>
/// <param name="path">The path to the file</param>
/// <returns>The data view.</returns>
public static IDataView ReadFromTextFile(this DataOperations catalog,
TextLoader.Column[] columns, string path, Action <TextLoader.Arguments> advancedSettings = null)
{
Contracts.CheckNonEmpty(path, nameof(path));
var env = catalog.GetEnvironment();
// REVIEW: it is almost always a mistake to have a 'trainable' text loader here.
// Therefore, we are going to disallow data sample.
var reader = new TextLoader(env, columns, advancedSettings, dataSample: null);
return(reader.Read(new MultiFileSource(path)));
}
/// <summary>
/// Read a data view from a text file using <see cref="TextLoader"/>.
/// </summary>
/// <param name="catalog">The catalog.</param>
/// <param name="columns">The columns of the schema.</param>
/// <param name="hasHeader">Whether the file has a header.</param>
/// <param name="separatorChar">The character used as separator between data points in a row. By default the tab character is used as separator.</param>
/// <param name="path">The path to the file.</param>
/// <returns>The data view.</returns>
public static IDataView ReadFromTextFile(this DataOperations catalog,
string path, Column[] columns, bool hasHeader = false, char separatorChar = '\t')
{
Contracts.CheckNonEmpty(path, nameof(path));
var env = catalog.GetEnvironment();
// REVIEW: it is almost always a mistake to have a 'trainable' text loader here.
// Therefore, we are going to disallow data sample.
var reader = new TextLoader(env, columns, hasHeader, separatorChar, dataSample: null);
return(reader.Read(new MultiFileSource(path)));
}
