public Impl(IHostEnvironment env, string name, IDataView input, OneToOneColumn col,
DataViewType typeDst, ValueMapper <T1, T2> map1, ValueMapper <T2, T3> map2 = null,
ValueGetter <VBuffer <ReadOnlyMemory <char> > > keyValueGetter = null, ValueGetter <VBuffer <ReadOnlyMemory <char> > > slotNamesGetter = null)
: base(env, name, new[] { col }, input, x => null)
{
Host.Assert(typeDst.RawType == typeof(T3));
Host.AssertValue(map1);
Host.Assert(map2 != null || typeof(T2) == typeof(T3));
_typeDst = typeDst;
_map1 = map1;
_map2 = map2;
if (keyValueGetter != null || slotNamesGetter != null)
{
using (var bldr = Metadata.BuildMetadata(0))
{
if (keyValueGetter != null)
{
AnnotationUtils.AnnotationGetter <VBuffer <ReadOnlyMemory <char> > > mdGetter =
(int c, ref VBuffer <ReadOnlyMemory <char> > dst) => keyValueGetter(ref dst);
bldr.AddGetter(AnnotationUtils.Kinds.KeyValues, new VectorType(TextDataViewType.Instance, _typeDst.GetItemType().GetKeyCountAsInt32(Host)), mdGetter);
}
if (slotNamesGetter != null)
{
int vectorSize = _typeDst.GetVectorSize();
Host.Assert(vectorSize > 0);
AnnotationUtils.AnnotationGetter <VBuffer <ReadOnlyMemory <char> > > mdGetter =
(int c, ref VBuffer <ReadOnlyMemory <char> > dst) => slotNamesGetter(ref dst);
bldr.AddGetter(AnnotationUtils.Kinds.SlotNames, new VectorType(TextDataViewType.Instance, vectorSize), mdGetter);
}
}
}
Metadata.Seal();
}
private static DataViewType GetPredColType(DataViewType scoreType, ISchemaBoundRowMapper mapper) => new KeyDataViewType(typeof(uint), scoreType.GetVectorSize());
/// <summary> /// Whether this is a vector type with known size. Returns false for non-vector types. /// Equivalent to <c><see cref="GetVectorSize"/> > 0</c>. /// </summary> public static bool IsKnownSizeVector(this DataViewType columnType) => columnType.GetVectorSize() > 0;
