private bool TryGetGroupSummaryMetrics(Dictionary <string, IDataView>[] metrics, out IDataView gs)
{
Host.AssertNonEmpty(metrics);
if (metrics.Length == 1)
{
return(metrics[0].TryGetValue(RankingEvaluator.GroupSummary, out gs));
}
gs = null;
var gsList = new List <IDataView>();
for (int i = 0; i < metrics.Length; i++)
{
IDataView idv;
if (!metrics[i].TryGetValue(RankingEvaluator.GroupSummary, out idv))
{
return(false);
}
idv = EvaluateUtils.AddFoldIndex(Host, idv, i, metrics.Length);
gsList.Add(idv);
}
gs = AppendRowsDataView.Create(Host, gsList[0].Schema, gsList.ToArray());
return(true);
}
public RandCursor(AppendRowsDataView parent, Func <int, bool> needCol, Random rand, int[] counts)
: base(parent)
{
Ch.AssertValue(needCol);
Ch.AssertValue(rand);
_rand = rand;
Ch.AssertValue(counts);
Ch.Assert(Sources.Length == counts.Length);
_cursorSet = new RowCursor[counts.Length];
for (int i = 0; i < counts.Length; i++)
{
Ch.Assert(counts[i] >= 0);
_cursorSet[i] = parent._sources[i].GetRowCursor(needCol, RandomUtils.Create(_rand));
}
_sampler = new MultinomialWithoutReplacementSampler(Ch, counts, rand);
_currentSourceIndex = -1;
for (int c = 0; c < Getters.Length; c++)
{
if (needCol(c))
{
Getters[c] = CreateGetter(c);
}
}
}
public CursorBase(AppendRowsDataView parent)
: base(parent._host)
{
Sources = parent._sources;
Ch.AssertNonEmpty(Sources);
Schema = parent._schema;
Getters = new Delegate[Schema.Count];
}
public Cursor(AppendRowsDataView parent, IEnumerable <Schema.Column> columnsNeeded)
: base(parent)
{
_currentSourceIndex = 0;
_currentCursor = Sources[_currentSourceIndex].GetRowCursor(columnsNeeded);
_currentIdGetter = _currentCursor.GetIdGetter();
foreach (var col in columnsNeeded)
{
Getters[col.Index] = CreateGetter(col.Index);
}
}
public Cursor(AppendRowsDataView parent, Func <int, bool> needCol)
: base(parent)
{
Ch.AssertValue(needCol);
_currentSourceIndex = 0;
_currentCursor = Sources[_currentSourceIndex].GetRowCursor(needCol);
_currentIdGetter = _currentCursor.GetIdGetter();
for (int c = 0; c < Getters.Length; c++)
{
if (needCol(c))
{
Getters[c] = CreateGetter(c);
}
}
}
public RandCursor(AppendRowsDataView parent, IEnumerable <Schema.Column> columnsNeeded, Random rand, int[] counts)
: base(parent)
{
Ch.AssertValue(rand);
_rand = rand;
Ch.AssertValue(counts);
Ch.Assert(Sources.Length == counts.Length);
_cursorSet = new RowCursor[counts.Length];
for (int i = 0; i < counts.Length; i++)
{
Ch.Assert(counts[i] >= 0);
_cursorSet[i] = parent._sources[i].GetRowCursor(columnsNeeded, RandomUtils.Create(_rand));
}
_sampler = new MultinomialWithoutReplacementSampler(Ch, counts, rand);
_currentSourceIndex = -1;
foreach (var col in columnsNeeded)
{
Getters[col.Index] = CreateGetter(col.Index);
}
}
