internal static ModelProto ConvertTransformListToOnnxModel(OnnxContextImpl ctx, IChannel ch, IDataView inputData, IDataView outputData,
LinkedList <ITransformCanSaveOnnx> transforms, HashSet <string> inputColumnNamesToDrop = null, HashSet <string> outputColumnNamesToDrop = null)
{
inputColumnNamesToDrop = inputColumnNamesToDrop ?? new HashSet <string>();
outputColumnNamesToDrop = outputColumnNamesToDrop ?? new HashSet <string>();
HashSet <string> inputColumns = new HashSet <string>();
// Create graph inputs.
for (int i = 0; i < inputData.Schema.Count; i++)
{
string colName = inputData.Schema[i].Name;
if (inputColumnNamesToDrop.Contains(colName))
{
continue;
}
ctx.AddInputVariable(inputData.Schema[i].Type, colName);
inputColumns.Add(colName);
}
// Create graph nodes, outputs and intermediate values.
foreach (var trans in transforms)
{
ch.Assert(trans.CanSaveOnnx(ctx));
trans.SaveAsOnnx(ctx);
}
// Add graph outputs.
for (int i = 0; i < outputData.Schema.Count; ++i)
{
if (outputData.Schema[i].IsHidden)
{
continue;
}
var idataviewColumnName = outputData.Schema[i].Name;
// Since the last IDataView also contains columns of the initial IDataView, last IDataView's columns found in
// _inputToDrop should be removed too.
if (inputColumnNamesToDrop.Contains(idataviewColumnName) || outputColumnNamesToDrop.Contains(idataviewColumnName))
{
continue;
}
var variableName = ctx.TryGetVariableName(idataviewColumnName);
// Null variable name occurs when an unsupported transform produces an output and a downsteam step consumes that output.
// or user accidently removes a transform whose output is used by other transforms.
ch.Check(variableName != null, "The targeted pipeline can not be fully converted into a well-defined ONNX model. " +
"Please check if all steps in that pipeline are convertible to ONNX " +
"and all necessary variables are not dropped (via command line arguments).");
var trueVariableName = ctx.AddIntermediateVariable(null, idataviewColumnName, true);
ctx.CreateNode("Identity", variableName, trueVariableName, ctx.GetNodeName("Identity"), "");
ctx.AddOutputVariable(outputData.Schema[i].Type, trueVariableName);
}
return(ctx.MakeModel());
}
private void Run(IChannel ch)
{
IDataLoader loader = null;
IPredictor rawPred = null;
IDataView view;
RoleMappedSchema trainSchema = null;
if (_model == null)
{
if (string.IsNullOrEmpty(Args.InputModelFile))
{
loader = CreateLoader();
rawPred = null;
trainSchema = null;
Host.CheckUserArg(Args.LoadPredictor != true, nameof(Args.LoadPredictor),
"Cannot be set to true unless " + nameof(Args.InputModelFile) + " is also specifified.");
}
else
{
LoadModelObjects(ch, _loadPredictor, out rawPred, true, out trainSchema, out loader);
}
view = loader;
}
else
{
view = _model.Apply(Host, new EmptyDataView(Host, _model.InputSchema));
}
// 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, Args.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);
}
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.");
}
HashSet <string> inputColumns = new HashSet <string>();
//Create graph inputs.
for (int i = 0; i < source.Schema.Count; i++)
{
string colName = source.Schema[i].Name;
if (_inputsToDrop.Contains(colName))
{
continue;
}
ctx.AddInputVariable(source.Schema[i].Type, colName);
inputColumns.Add(colName);
}
//Create graph nodes, outputs and intermediate values.
foreach (var trans in transforms)
{
Host.Assert(trans.CanSaveOnnx(ctx));
trans.SaveAsOnnx(ctx);
}
//Add graph outputs.
for (int i = 0; i < end.Schema.Count; ++i)
{
if (end.Schema[i].IsHidden)
{
continue;
}
var idataviewColumnName = end.Schema[i].Name;
// Since the last IDataView also contains columns of the initial IDataView, last IDataView's columns found in
// _inputToDrop should be removed too.
if (_inputsToDrop.Contains(idataviewColumnName) || _outputsToDrop.Contains(idataviewColumnName))
{
continue;
}
var variableName = ctx.TryGetVariableName(idataviewColumnName);
var trueVariableName = ctx.AddIntermediateVariable(null, idataviewColumnName, true);
ctx.CreateNode("Identity", variableName, trueVariableName, ctx.GetNodeName("Identity"), "");
ctx.AddOutputVariable(end.Schema[i].Type, trueVariableName);
}
var model = ctx.MakeModel();
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(Args.OutputModelFile))
{
Contracts.Assert(loader != null);
ch.Trace("Saving the data pipe");
// Should probably include "end"?
SaveLoader(loader, Args.OutputModelFile);
}
}