public Cursor(IChannelProvider provider, DataView view, Func <int, bool> predicate, Random rand)
: base(provider)
{
Ch.AssertValue(view);
Ch.AssertValueOrNull(rand);
Ch.Assert(view.Schema.Count >= 0);
_view = view;
_active = new BitArray(view.Schema.Count);
if (predicate == null)
{
_active.SetAll(true);
}
else
{
for (int i = 0; i < view.Schema.Count; ++i)
{
_active[i] = predicate(i);
}
}
if (rand != null)
{
_indices = Utils.GetRandomPermutation(rand, view._rowCount);
}
}
public Cursor(IHostEnvironment env, string name, ListDataView <TRow> dataView,
Func <int, bool> predicate, Random rand)
: base(env, dataView, predicate)
{
Ch.AssertValueOrNull(rand);
_data = dataView._data;
if (rand != null)
{
_permutation = Utils.GetRandomPermutation(rand, dataView._data.Count);
}
}
public Cursor(IChannelProvider provider, string name, ListDataView <TRow> dataView,
Func <int, bool> predicate, IRandom rand)
: base(provider, dataView, predicate)
{
Ch.AssertValueOrNull(rand);
_data = dataView._data;
if (rand != null)
{
_permutation = Utils.GetRandomPermutation(rand, dataView._data.Count);
}
}
public RowCursor(NgramHashTransform parent, IRowCursor input, bool[] active, FinderDecorator decorator = null)
: base(parent.Host, input)
{
Ch.AssertValue(parent);
Ch.Assert(active == null || active.Length == parent._bindings.ColumnCount);
Ch.AssertValueOrNull(decorator);
_bindings = parent._bindings;
_active = active;
_getters = new Delegate[_bindings.Infos.Length];
for (int iinfo = 0; iinfo < _bindings.Infos.Length; iinfo++)
{
if (IsIndexActive(iinfo))
{
_getters[iinfo] = parent.MakeGetter(Ch, Input, iinfo, decorator);
}
}
}
public Cursor(IChannelProvider provider, IDataTransform view, Bindings bindings, Func <int, bool> predicate, Random rand)
: base(provider)
{
Ch.AssertValue(view);
Ch.AssertValueOrNull(rand);
Ch.Assert(view.Schema.Count >= 0);
_view = view;
_bindings = bindings;
_cursor = view.Source.GetRowCursorForAllColumns();
_active = new BitArray(view.Schema.Count);
if (predicate == null)
{
_active.SetAll(true);
}
else
{
for (int i = 0; i < view.Schema.Count; ++i)
{
_active[i] = predicate(i);
}
}
}