public Mapper(KeyToValueMappingTransformer parent, Schema inputSchema)
: base(parent.Host.Register(nameof(Mapper)), parent, inputSchema)
{
_parent = parent;
ComputeKvMaps(inputSchema, out _types, out _kvMaps);
}
private void Run(IChannel ch)
{
ILegacyDataLoader loader = null;
IPredictor rawPred = null;
IDataView view;
RoleMappedSchema trainSchema = null;
if (_model == null && _predictiveModel == null)
{
if (string.IsNullOrEmpty(ImplOptions.InputModelFile))
{
loader = CreateLoader();
rawPred = null;
trainSchema = null;
Host.CheckUserArg(ImplOptions.LoadPredictor != true, nameof(ImplOptions.LoadPredictor),
"Cannot be set to true unless " + nameof(ImplOptions.InputModelFile) + " is also specified.");
}
else
{
LoadModelObjects(ch, _loadPredictor, out rawPred, true, out trainSchema, out loader);
}
view = loader;
}
else if (_model != null)
{
view = _model.Apply(Host, new EmptyDataView(Host, _model.InputSchema));
}
else
{
view = _predictiveModel.TransformModel.Apply(Host, new EmptyDataView(Host, _predictiveModel.TransformModel.InputSchema));
rawPred = _predictiveModel.Predictor;
trainSchema = _predictiveModel.GetTrainingSchema(Host);
}
// Create the ONNX context for storing global information
var assembly = System.Reflection.Assembly.GetExecutingAssembly();
var versionInfo = System.Diagnostics.FileVersionInfo.GetVersionInfo(assembly.Location);
var ctx = new OnnxContextImpl(Host, _name, ProducerName, versionInfo.FileVersion,
ModelVersion, _domain, ImplOptions.OnnxVersion);
// Get the transform chain.
IDataView source;
IDataView end;
LinkedList <ITransformCanSaveOnnx> transforms;
GetPipe(ctx, ch, view, out source, out end, out transforms);
Host.Assert(transforms.Count == 0 || transforms.Last.Value == end);
// If we have a predictor, try to get the scorer for it.
if (rawPred != null)
{
RoleMappedData data;
if (trainSchema != null)
{
data = new RoleMappedData(end, trainSchema.GetColumnRoleNames());
}
else
{
// We had a predictor, but no roles stored in the model. Just suppose
// default column names are OK, if present.
data = new RoleMappedData(end, DefaultColumnNames.Label,
DefaultColumnNames.Features, DefaultColumnNames.GroupId, DefaultColumnNames.Weight, DefaultColumnNames.Name, opt: true);
}
var scorePipe = ScoreUtils.GetScorer(rawPred, data, Host, trainSchema);
var scoreOnnx = scorePipe as ITransformCanSaveOnnx;
if (scoreOnnx?.CanSaveOnnx(ctx) == true)
{
Host.Assert(scorePipe.Source == end);
end = scorePipe;
transforms.AddLast(scoreOnnx);
if (rawPred.PredictionKind == PredictionKind.BinaryClassification || rawPred.PredictionKind == PredictionKind.MulticlassClassification)
{
// Check if the PredictedLabel Column is a KeyDataViewType and has KeyValue Annotations.
// If it does, add a KeyToValueMappingTransformer, to enable NimbusML to get the values back
// when using an ONNX model, as described in https://github.com/dotnet/machinelearning/pull/4841
var predictedLabelColumn = scorePipe.Schema.GetColumnOrNull(DefaultColumnNames.PredictedLabel);
if (predictedLabelColumn.HasValue && HasKeyValues(predictedLabelColumn.Value))
{
var outputData = new KeyToValueMappingTransformer(Host, DefaultColumnNames.PredictedLabel).Transform(scorePipe);
end = outputData;
transforms.AddLast(outputData as ITransformCanSaveOnnx);
}
}
}
else
{
Contracts.CheckUserArg(_loadPredictor != true,
nameof(Arguments.LoadPredictor), "We were explicitly told to load the predictor but we do not know how to save it as ONNX.");
ch.Warning("We do not know how to save the predictor as ONNX. Ignoring.");
}
}
else
{
Contracts.CheckUserArg(_loadPredictor != true,
nameof(Arguments.LoadPredictor), "We were explicitly told to load the predictor but one was not present.");
}
// Convert back to values the KeyDataViewType "pass-through" columns
// (i.e those that remained untouched by the model). This is done to enable NimbusML to get these values
// as described in https://github.com/dotnet/machinelearning/pull/4841
var passThroughColumnNames = GetPassThroughKeyDataViewTypeColumnsNames(source, end);
foreach (var name in passThroughColumnNames)
{
var outputData = new KeyToValueMappingTransformer(Host, name).Transform(end);
end = outputData;
transforms.AddLast(end as ITransformCanSaveOnnx);
}
var model = ConvertTransformListToOnnxModel(ctx, ch, source, end, transforms, _inputsToDrop, _outputsToDrop);
using (var file = Host.CreateOutputFile(_outputModelPath))
using (var stream = file.CreateWriteStream())
model.WriteTo(stream);
if (_outputJsonModelPath != null)
{
using (var file = Host.CreateOutputFile(_outputJsonModelPath))
using (var stream = file.CreateWriteStream())
using (var writer = new StreamWriter(stream))
{
var parsedJson = JsonConvert.DeserializeObject(model.ToString());
writer.Write(JsonConvert.SerializeObject(parsedJson, Formatting.Indented));
}
}
if (!string.IsNullOrWhiteSpace(ImplOptions.OutputModelFile))
{
Contracts.Assert(loader != null);
ch.Trace("Saving the data pipe");
// Should probably include "end"?
SaveLoader(loader, ImplOptions.OutputModelFile);
}
}
