public static DataMap FromJagged <T>(T[][] source, string[] columnNames = null, bool transpose = false, IEqualityComparer <string> keyComparaer = null)
{
var result = new DataMap(keyComparaer);
if (!transpose)
{
if (columnNames == null)
{
var c = source[0].Length;
columnNames = new string[c];
for (var i = 0; i < c; ++i)
{
columnNames[i] = "Column" + i;
}
}
for (var i = 0; i < columnNames.Length; ++i)
{
var data = new List <T>(source.Length);
result.Add(columnNames[i], data);
for (var j = 0; j < source.Length; ++j)
{
var row = source[j];
if (i < row.Length)
{
data.Add(row[i]);
}
else
{
data.Add(TypeTrait <T> .GetNaN());
}
}
}
}
else
{
if (columnNames == null)
{
var c = source.Length;
columnNames = new string[c];
for (var i = 0; i < c; ++i)
{
columnNames[i] = "Column" + i;
}
}
for (var i = 0; i < columnNames.Length; ++i)
{
result.Add(columnNames[i], source[i]);
}
}
return(result);
}
/*
* public static DataMap FromDictionary(IDictionary<string, IList> source)
* {
* var result = new DataMap();
*
* foreach (var entry in source)
* result.AddLast(entry.Key, entry.Value);
*
* return result;
* }
*/
public static DataMap FromDictionary(IDictionary source, IEqualityComparer <string> keyComparaer = null)
{
var result = new DataMap(keyComparaer);
foreach (DictionaryEntry entry in source)
{
result.AddLast((string)entry.Key, (IList)entry.Value);
}
return(result);
}
public JoinKeyMap(DataMap dataMap, string[] keyColumns)
{
if (keyColumns.Length > 6)
{
throw new ArgumentException("More than six key columns are not supported");
}
_dataMap = dataMap;
_keyColumns = keyColumns;
_indexMap = GetJoinKeyMap();
}
public KFoldSplitter(DataMap dataMap, int k, bool shuffle = false, IRandom random = null)
{
_k = k;
_dataMap = dataMap;
_folds = new int[dataMap.MaxRowCount];
for (var i = 0; i < _folds.Length; ++i)
{
_folds[i] = (int)(i / k);
}
if (shuffle)
{
_folds.ShuffleFill(random);
}
}
public DataMapEnumerator(DataMap map)
{
_e = map.Columns.GetEnumerator();
}
public KFold(int k, DataMap training, DataMap validation)
{
K = k;
Training = training;
Validation = validation;
}