public RowMapper(IHostEnvironment env, BindableMapper parent, RoleMappedSchema schema)
{
Contracts.AssertValue(env);
_env = env;
_env.AssertValue(schema);
_env.AssertValue(parent);
_env.Assert(schema.Feature.HasValue);
_parent = parent;
InputRoleMappedSchema = schema;
var genericMapper = parent.GenericMapper.Bind(_env, schema);
_genericRowMapper = genericMapper as ISchemaBoundRowMapper;
var featureSize = FeatureColumn.Type.GetVectorSize();
if (parent.Stringify)
{
var builder = new DataViewSchema.Builder();
builder.AddColumn(DefaultColumnNames.FeatureContributions, TextDataViewType.Instance, null);
_outputSchema = builder.ToSchema();
if (FeatureColumn.HasSlotNames(featureSize))
{
FeatureColumn.Annotations.GetValue(AnnotationUtils.Kinds.SlotNames, ref _slotNames);
}
else
{
_slotNames = VBufferUtils.CreateEmpty <ReadOnlyMemory <char> >(featureSize);
}
}
else
{
var metadataBuilder = new DataViewSchema.Annotations.Builder();
if (InputSchema[FeatureColumn.Index].HasSlotNames(featureSize))
{
metadataBuilder.AddSlotNames(featureSize, (ref VBuffer <ReadOnlyMemory <char> > value) =>
FeatureColumn.Annotations.GetValue(AnnotationUtils.Kinds.SlotNames, ref value));
}
var schemaBuilder = new DataViewSchema.Builder();
var featureContributionType = new VectorType(NumberDataViewType.Single, FeatureColumn.Type as VectorType);
schemaBuilder.AddColumn(DefaultColumnNames.FeatureContributions, featureContributionType, metadataBuilder.ToAnnotations());
_outputSchema = schemaBuilder.ToSchema();
}
_outputGenericSchema = _genericRowMapper.OutputSchema;
OutputSchema = new ZipBinding(new DataViewSchema[] { _outputGenericSchema, _outputSchema, }).OutputSchema;
}
public RowMapper(IHostEnvironment env, BindableMapper parent, RoleMappedSchema schema)
{
Contracts.AssertValue(env);
_env = env;
_env.AssertValue(schema);
_env.AssertValue(parent);
_env.Assert(schema.Feature.HasValue);
_parent = parent;
InputRoleMappedSchema = schema;
var genericMapper = parent.GenericMapper.Bind(_env, schema);
_genericRowMapper = genericMapper as ISchemaBoundRowMapper;
if (parent.Stringify)
{
var builder = new SchemaBuilder();
builder.AddColumn(DefaultColumnNames.FeatureContributions, TextType.Instance, null);
_outputSchema = builder.GetSchema();
if (FeatureColumn.HasSlotNames(FeatureColumn.Type.VectorSize))
{
FeatureColumn.Metadata.GetValue(MetadataUtils.Kinds.SlotNames, ref _slotNames);
}
else
{
_slotNames = VBufferUtils.CreateEmpty <ReadOnlyMemory <char> >(FeatureColumn.Type.VectorSize);
}
}
else
{
_outputSchema = Schema.Create(new FeatureContributionSchema(_env, DefaultColumnNames.FeatureContributions,
new VectorType(NumberType.R4, FeatureColumn.Type as VectorType),
InputSchema, FeatureColumn.Index));
}
_outputGenericSchema = _genericRowMapper.OutputSchema;
OutputSchema = new ZipBinding(new Schema[] { _outputGenericSchema, _outputSchema, }).OutputSchema;
}