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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Microsoft.ML;
using Microsoft.ML.CommandLine;
using Microsoft.ML.Data;
using Microsoft.ML.EntryPoints;
using Microsoft.ML.Internal.Utilities;
using Microsoft.ML.OnnxRuntime;
using Microsoft.ML.Runtime;
using Microsoft.ML.Transforms.Onnx;
using static Microsoft.ML.Model.OnnxConverter.OnnxCSharpToProtoWrapper;
using OnnxShape = System.Collections.Generic.List<int>;
[assembly: LoadableClass(OnnxTransformer.Summary, typeof(IDataTransform), typeof(OnnxTransformer),
typeof(OnnxTransformer.Options), typeof(SignatureDataTransform), OnnxTransformer.UserName, OnnxTransformer.ShortName, "OnnxTransform", "OnnxScorer")]
[assembly: LoadableClass(OnnxTransformer.Summary, typeof(IDataTransform), typeof(OnnxTransformer),
null, typeof(SignatureLoadDataTransform), OnnxTransformer.UserName, OnnxTransformer.LoaderSignature)]
[assembly: LoadableClass(typeof(OnnxTransformer), null, typeof(SignatureLoadModel),
OnnxTransformer.UserName, OnnxTransformer.LoaderSignature)]
[assembly: LoadableClass(typeof(IRowMapper), typeof(OnnxTransformer), null, typeof(SignatureLoadRowMapper),
OnnxTransformer.UserName, OnnxTransformer.LoaderSignature)]
[assembly: EntryPointModule(typeof(OnnxTransformer))]
namespace Microsoft.ML.Transforms.Onnx
{
/// <summary>
/// <see cref="ITransformer"/> resulting from fitting an <see cref="OnnxScoringEstimator"/>.
/// Please refer to <see cref="OnnxScoringEstimator"/> to learn more about the necessary dependencies,
/// and how to run it on a GPU.
/// </summary>
public sealed class OnnxTransformer : RowToRowTransformerBase, IDisposable
{
/// <summary>
/// A class used for capturing shape information from command line.
/// <see cref="Name"/> is a tensor name while <see cref="Shape"/> is that tenor's desired shape.
/// <see cref="CustomShapeInfo"/> is useful because sometime we want to overwrite unknown
/// shapes loaded from ONNX model.
/// </summary>
internal sealed class CustomShapeInfo
{
// Examples of how a column is defined in command line API:
// 2-by-3 tensor:
// Name=tensorName shape=2 shape=3
public CustomShapeInfo() { }
public CustomShapeInfo(string name, int[] shape)
{
Name = name;
Shape = shape;
}
[Argument(ArgumentType.Required, HelpText = "Name of the column")]
public string Name;
[Argument(ArgumentType.Multiple, HelpText = "Shape of the column")]
public int[] Shape;
}
internal sealed class Options : TransformInputBase
{
[Argument(ArgumentType.Required, HelpText = "Path to the onnx model file.", ShortName = "model", SortOrder = 0)]
public string ModelFile;
[Argument(ArgumentType.Multiple | ArgumentType.Required, HelpText = "Name of the input column.", SortOrder = 1)]
public string[] InputColumns;
[Argument(ArgumentType.Multiple | ArgumentType.Required, HelpText = "Name of the output column.", SortOrder = 2)]
public string[] OutputColumns;
[Argument(ArgumentType.AtMostOnce, HelpText = "GPU device id to run on (e.g. 0,1,..). Null for CPU. Requires CUDA 9.1.", SortOrder = 3)]
public int? GpuDeviceId = null;
[Argument(ArgumentType.AtMostOnce, HelpText = "If true, resumes execution on CPU upon GPU error. If false, will raise the GPU exception.", SortOrder = 4)]
public bool FallbackToCpu = false;
[Argument(ArgumentType.Multiple, HelpText = "Shapes used to overwrite shapes loaded from ONNX file.", SortOrder = 5)]
public CustomShapeInfo[] CustomShapeInfos;
[Argument(ArgumentType.AtMostOnce, HelpText = "Protobuf CodedInputStream recursion limit.", SortOrder = 6)]
public int RecursionLimit = 100;
[Argument(ArgumentType.AtMostOnce, HelpText = "Controls the number of threads used to parallelize the execution of the graph (across nodes).", SortOrder = 7)]
public int? InterOpNumThreads = null;
[Argument(ArgumentType.AtMostOnce, HelpText = "Controls the number of threads to use to run the model.", SortOrder = 8)]
public int? IntraOpNumThreads = null;
// No argument cause it can't be used via cmd
public Stream ModelBytes = null;
}
/// <summary>
/// Options used to construct this class.
/// </summary>
private readonly Options _options;
/// <summary>
/// This field is internal because the associated estimator may access it.
/// </summary>
internal readonly OnnxModel Model;
internal const string Summary = "Transforms the data using the Onnx model.";
internal const string UserName = "ONNX Scoring Transform";
internal const string ShortName = "Onnx";
internal const string LoaderSignature = "OnnxTransform";
/// <summary>
/// Input column names from ML.NET's perspective. It can be ordered differently than ONNX model's input list.
/// It's also possible that the <see cref="Inputs"/> contains less variables than ONNX model's input list.
/// For each name in <see cref="Inputs"/>, an input tensor with the same name can be found in the underlying ONNX model.
/// </summary>
internal string[] Inputs { get; }
/// <summary>
/// Output column names from ML.NET's perspective. It can be ordered differently than ONNX model's output list.
/// It's also possible that the <see cref="Outputs"/> contains less variables than ONNX model's output list.
/// For each name in <see cref="Outputs"/>, an output tensor with the same name can be found in the underlying ONNX model.
/// </summary>
internal string[] Outputs { get; }
/// <summary>
/// Types of <see cref="Outputs"/>. The i-th element is the type of the i-th output in <see cref="Outputs"/>.
/// </summary>
internal DataViewType[] OutputTypes { get; }
private static VersionInfo GetVersionInfo()
{
return new VersionInfo(
modelSignature: "ONNXSCOR",
// version 10001 is single input & output.
// version 10002 = multiple inputs & outputs
// version 10003 = custom protobuf recursion limit
verWrittenCur: 0x00010003,
verReadableCur: 0x00010003,
verWeCanReadBack: 0x00010001,
loaderSignature: LoaderSignature,
loaderAssemblyName: typeof(OnnxTransformer).Assembly.FullName);
}
// Factory method for SignatureDataTransform
private static IDataTransform Create(IHostEnvironment env, Options options, IDataView input)
{
return new OnnxTransformer(env, options).MakeDataTransform(input);
}
// Factory method for SignatureLoadDataTransform
private static IDataTransform Create(IHostEnvironment env, ModelLoadContext ctx, IDataView input)
=> Create(env, ctx).MakeDataTransform(input);
// Factory method for SignatureLoadModel.
private static OnnxTransformer Create(IHostEnvironment env, ModelLoadContext ctx)
{
Contracts.CheckValue(env, nameof(env));
env.CheckValue(ctx, nameof(ctx));
ctx.CheckAtModel(GetVersionInfo());
byte[] modelBytes = null;
if (!ctx.TryLoadBinaryStream("OnnxModel", r => modelBytes = r.ReadByteArray()))
throw env.ExceptDecode();
bool supportsMultiInputOutput = ctx.Header.ModelVerWritten > 0x00010001;
var numInputs = (supportsMultiInputOutput) ? ctx.Reader.ReadInt32() : 1;
env.CheckDecode(numInputs > 0);
var inputs = new string[numInputs];
for (int j = 0; j < inputs.Length; j++)
inputs[j] = ctx.LoadNonEmptyString();
var numOutputs = (supportsMultiInputOutput) ? ctx.Reader.ReadInt32() : 1;
env.CheckDecode(numOutputs > 0);
var outputs = new string[numOutputs];
for (int j = 0; j < outputs.Length; j++)
outputs[j] = ctx.LoadNonEmptyString();
// Save custom-provided shapes. Those shapes overwrite shapes loaded from the ONNX model file.
int customShapeInfosLength = ctx.Reader.ReadInt32(); // 0 means no custom shape. Non-zero means count of custom shapes.
CustomShapeInfo[] loadedCustomShapeInfos = null;
if (customShapeInfosLength > 0)
{
loadedCustomShapeInfos = new CustomShapeInfo[customShapeInfosLength];
for (int i = 0; i < customShapeInfosLength; ++i)
{
var name = ctx.LoadNonEmptyString();
var shape = ctx.Reader.ReadIntArray();
loadedCustomShapeInfos[i] = new CustomShapeInfo() { Name = name, Shape = shape };
}
}
int recursionLimit;
// Recursion limit change
if (ctx.Header.ModelVerWritten >= 0x00010003)
{
recursionLimit = ctx.Reader.ReadInt32();
}
else
{
// Default if not written inside ONNX model
recursionLimit = 100;
}
var options = new Options()
{
InputColumns = inputs,
OutputColumns = outputs,
CustomShapeInfos = loadedCustomShapeInfos,
RecursionLimit = recursionLimit
};
IHostEnvironmentInternal localEnvironment = env as IHostEnvironmentInternal;
if (localEnvironment is not null)
{
options.GpuDeviceId = localEnvironment.GpuDeviceId;
options.FallbackToCpu = localEnvironment.FallbackToCpu;
}
return new OnnxTransformer(env, options, modelBytes);
}
// Factory method for SignatureLoadRowMapper.
private static IRowMapper Create(IHostEnvironment env, ModelLoadContext ctx, DataViewSchema inputSchema)
=> Create(env, ctx).MakeRowMapper(inputSchema);
private OnnxTransformer(IHostEnvironment env, Options options, byte[] modelBytes = null) :
base(Contracts.CheckRef(env, nameof(env)).Register(nameof(OnnxTransformer)))
{
Host.CheckValue(options, nameof(options));
foreach (var col in options.InputColumns)
Host.CheckNonWhiteSpace(col, nameof(options.InputColumns));
foreach (var col in options.OutputColumns)
Host.CheckNonWhiteSpace(col, nameof(options.OutputColumns));
// Cast options.CustomShapeInfos so that the user-specified shapes can be consumed by other
// internal functions. If nothing is provided, shapeDictionary is null.
var shapeDictionary = new Dictionary<string, int[]>();
if (options.CustomShapeInfos != null)
foreach (var customShape in options.CustomShapeInfos)
shapeDictionary[customShape.Name] = customShape.Shape;
// Use ONNXRuntime to figure out the right input and output configuration.
// However, ONNXRuntime doesn't provide strongly-typed method to access the produced
// variables, we will inspect the ONNX model file to get information regarding types.
try
{
if (modelBytes == null)
{
if (options.ModelBytes == null)
{
// Entering this region means that the model file is passed in by the user.
Host.CheckNonWhiteSpace(options.ModelFile, nameof(options.ModelFile));
Host.CheckIO(File.Exists(options.ModelFile), "Model file {0} does not exists.", options.ModelFile);
// Because we cannot delete the user file, ownModelFile should be false.
Model = new OnnxModel(env, options.ModelFile, options.GpuDeviceId, options.FallbackToCpu, ownModelFile: false, shapeDictionary: shapeDictionary, options.RecursionLimit,
options.InterOpNumThreads, options.IntraOpNumThreads);
}
else
{
// Entering this region means that the model bytes are passed in by the user.
Host.CheckValue(options.ModelBytes, nameof(options.ModelBytes));
Model = OnnxModel.CreateFromStream(options.ModelBytes, env, options.GpuDeviceId, options.FallbackToCpu, shapeDictionary: shapeDictionary, options.RecursionLimit);
}
}
else
{
// Entering this region means that the byte[] is passed as the model. To feed that byte[] to ONNXRuntime, we need
// to create a temporal file to store it and then call ONNXRuntime's API to load that file.
Model = OnnxModel.CreateFromBytes(modelBytes, env, options.GpuDeviceId, options.FallbackToCpu, shapeDictionary: shapeDictionary, options.RecursionLimit);
}
}
catch (OnnxRuntimeException e)
{
throw Host.Except(e, $"Error initializing model :{e.ToString()}");
}
var modelInfo = Model.ModelInfo;
Inputs = (options.InputColumns.Count() == 0) ? Model.ModelInfo.InputNames.ToArray() : options.InputColumns;
Outputs = (options.OutputColumns.Count() == 0) ? Model.ModelInfo.OutputNames.ToArray() : options.OutputColumns;
OutputTypes = new DataViewType[Outputs.Length];
var numModelOutputs = Model.ModelInfo.OutputsInfo.Length;
for (int i = 0; i < Outputs.Length; i++)
{
var outputInfo = Model.ModelInfo.GetOutput(Outputs[i]);
OutputTypes[i] = outputInfo.DataViewType;
}
_options = options;
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. All possible output columns are generated, with names/types
/// specified by the model.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="modelFile">Model file path.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
internal OnnxTransformer(IHostEnvironment env, string modelFile, int? gpuDeviceId = null,
bool fallbackToCpu = false, IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100)
: this(env, new Options()
{
ModelFile = modelFile,
InputColumns = new string[] { },
OutputColumns = new string[] { },
GpuDeviceId = gpuDeviceId,
FallbackToCpu = fallbackToCpu,
CustomShapeInfos = shapeDictionary?.Select(pair => new CustomShapeInfo(pair.Key, pair.Value)).ToArray(),
RecursionLimit = recursionLimit
})
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. All possible output columns are generated, with names/types
/// specified by the model.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="modelBytes">Model file path.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
internal OnnxTransformer(IHostEnvironment env, Stream modelBytes, int? gpuDeviceId = null,
bool fallbackToCpu = false, IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100)
: this(env, new Options()
{
ModelBytes = modelBytes,
InputColumns = new string[] { },
OutputColumns = new string[] { },
GpuDeviceId = gpuDeviceId,
FallbackToCpu = fallbackToCpu,
CustomShapeInfos = shapeDictionary?.Select(pair => new CustomShapeInfo(pair.Key, pair.Value)).ToArray(),
RecursionLimit = recursionLimit
})
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. Only the output columns specified will be generated.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="outputColumnNames">The output columns to generate. Names must match model specifications. Data types are inferred from model.</param>
/// <param name="inputColumnNames">The name of the input data columns. Must match model's input names.</param>
/// <param name="modelFile">Model file path.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
/// <param name="interOpNumThreads">Controls the number of threads used to parallelize the execution of the graph (across nodes).</param>
/// <param name="intraOpNumThreads">Controls the number of threads to use to run the model.</param>
internal OnnxTransformer(IHostEnvironment env, string[] outputColumnNames, string[] inputColumnNames, string modelFile, int? gpuDeviceId = null, bool fallbackToCpu = false,
IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100,
int? interOpNumThreads = null, int? intraOpNumThreads = null)
: this(env, new Options()
{
ModelFile = modelFile,
InputColumns = inputColumnNames,
OutputColumns = outputColumnNames,
GpuDeviceId = gpuDeviceId,
FallbackToCpu = fallbackToCpu,
CustomShapeInfos = shapeDictionary?.Select(pair => new CustomShapeInfo(pair.Key, pair.Value)).ToArray(),
RecursionLimit = recursionLimit,
InterOpNumThreads = interOpNumThreads,
IntraOpNumThreads = intraOpNumThreads
})
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. Only the output columns specified will be generated.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="outputColumnNames">The output columns to generate. Names must match model specifications. Data types are inferred from model.</param>
/// <param name="inputColumnNames">The name of the input data columns. Must match model's input names.</param>
/// <param name="modelBytes">Model as bytes.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
/// <param name="interOpNumThreads">Controls the number of threads used to parallelize the execution of the graph (across nodes).</param>
/// <param name="intraOpNumThreads">Controls the number of threads to use to run the model.</param>
internal OnnxTransformer(IHostEnvironment env, string[] outputColumnNames, string[] inputColumnNames, Stream modelBytes, int? gpuDeviceId = null, bool fallbackToCpu = false,
IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100,
int? interOpNumThreads = null, int? intraOpNumThreads = null)
: this(env, new Options()
{
ModelBytes = modelBytes,
InputColumns = inputColumnNames,
OutputColumns = outputColumnNames,
GpuDeviceId = gpuDeviceId,
FallbackToCpu = fallbackToCpu,
CustomShapeInfos = shapeDictionary?.Select(pair => new CustomShapeInfo(pair.Key, pair.Value)).ToArray(),
RecursionLimit = recursionLimit,
InterOpNumThreads = interOpNumThreads,
IntraOpNumThreads = intraOpNumThreads
})
{
}
private protected override void SaveModel(ModelSaveContext ctx)
{
Host.AssertValue(ctx);
ctx.CheckAtModel();
ctx.SetVersionInfo(GetVersionInfo());
ctx.SaveBinaryStream("OnnxModel", w => { w.WriteByteArray(File.ReadAllBytes(Model.ModelStream.Name)); });
Host.CheckNonEmpty(Inputs, nameof(Inputs));
ctx.Writer.Write(Inputs.Length);
foreach (var colName in Inputs)
ctx.SaveNonEmptyString(colName);
Host.CheckNonEmpty(Outputs, nameof(Outputs));
ctx.Writer.Write(Outputs.Length);
foreach (var colName in Outputs)
ctx.SaveNonEmptyString(colName);
// Save custom-provided shapes. Those shapes overwrite shapes loaded from the ONNX model file.
int customShapeInfosLength = _options.CustomShapeInfos != null ? _options.CustomShapeInfos.Length : 0;
ctx.Writer.Write(customShapeInfosLength);
for (int i = 0; i < customShapeInfosLength; ++i)
{
var info = _options.CustomShapeInfos[i];
ctx.SaveNonEmptyString(info.Name);
ctx.Writer.WriteIntArray(info.Shape);
}
ctx.Writer.Write(_options.RecursionLimit);
}
private protected override IRowMapper MakeRowMapper(DataViewSchema inputSchema) => new Mapper(this, inputSchema);
/// <summary>
/// This design assumes that all unknown dimensions are 1s. It also convert scalar shape [] in ONNX to [1].
/// [TODO] We should infer the unknown shape from input data instead of forcing them to be 1.
/// </summary>
private static IEnumerable<int> AdjustDimensions(OnnxShape shape)
{
if (shape.Count > 0)
{
if (shape[0] < 0)
{
shape[0] = 1;
}
return shape.Select(x => (x <= 0) ? 0 : x);
}
return new[] { 1 };
}
/// <summary>
/// In the case that the ML.Net user wants a subset of columns or lists the columns in a different order then specified in the ONNX model,
/// we need to map from the ML.Net dataview column index to the ONNX model output index. This method does that mapping.
/// </summary>
/// <param name="iinfo">The index of the ML.Net column requested.</param>
/// <returns>The index of ONNX output.</returns>
internal int MapDataViewColumnToOnnxOutputTensor(int iinfo)
{
return Model.ModelInfo.OutputNames.IndexOf(Outputs[iinfo]);
}
private bool _isDisposed;
public void Dispose()
{
if (_isDisposed)
return;
Model?.Dispose();
_isDisposed = true;
}
private sealed class Mapper : MapperBase
{
private readonly OnnxTransformer _parent;
/// <summary>
/// <see cref="_inputColIndices"/>'s i-th element value tells the <see cref="IDataView"/> column index to
/// find the i-th ONNX input.
/// </summary>
private readonly int[] _inputColIndices;
/// <summary>
/// <see cref="_inputTensorShapes"/>'s i-th element value tells if the i-th ONNX input's shape if it's a tensor.
/// </summary>
private readonly OnnxShape[] _inputTensorShapes;
/// <summary>
/// <see cref="_inputOnnxTypes"/>'s i-th element value tells if the <see cref="Type"/> of the i-th ONNX input.
/// </summary>
private readonly Type[] _inputOnnxTypes;
public Mapper(OnnxTransformer parent, DataViewSchema inputSchema) :
base(Contracts.CheckRef(parent, nameof(parent)).Host.Register(nameof(Mapper)), inputSchema, parent)
{
_parent = parent;
_inputColIndices = new int[_parent.Inputs.Length];
_inputTensorShapes = new OnnxShape[_parent.Inputs.Length];
_inputOnnxTypes = new Type[_parent.Inputs.Length];
var model = _parent.Model;
for (int i = 0; i < _parent.Inputs.Length; i++)
{
var inputNodeInfo = model.ModelInfo.GetInput(_parent.Inputs[i]);
var shape = inputNodeInfo.Shape;
var inputShape = AdjustDimensions(inputNodeInfo.Shape);
// Only allow a single unkown size dimension
if (inputShape.Where(x => x == 0).Count() > 1)
throw new ArgumentOutOfRangeException(_parent.Inputs[i], "Only 1 unknown dimension is allowed");
_inputTensorShapes[i] = inputShape.ToList();
_inputOnnxTypes[i] = inputNodeInfo.TypeInOnnxRuntime;
var col = inputSchema.GetColumnOrNull(_parent.Inputs[i]);
if (!col.HasValue)
throw Host.ExceptSchemaMismatch(nameof(inputSchema), "input", _parent.Inputs[i]);
_inputColIndices[i] = col.Value.Index;
var type = inputSchema[_inputColIndices[i]].Type;
var vectorType = type as VectorDataViewType;
var itemType = type.GetItemType();
var nodeItemType = inputNodeInfo.DataViewType.GetItemType();
if (itemType != nodeItemType)
{
// If the ONNX model input node expects a type that mismatches with the type of the input IDataView column that is provided
// then throw an exception.
// This is done except in the case where the ONNX model input node expects a UInt32 but the input column is actually KeyDataViewType
// This is done to support a corner case originated in NimbusML. For more info, see: https://github.com/microsoft/NimbusML/issues/426
var isKeyType = itemType is KeyDataViewType;
if (!isKeyType || itemType.RawType != nodeItemType.RawType)
throw Host.ExceptSchemaMismatch(nameof(inputSchema), "input", _parent.Inputs[i], inputNodeInfo.DataViewType.GetItemType().ToString(), type.ToString());
}
// If the column is one dimension we make sure that the total size of the Onnx shape matches.
// Compute the total size of the known dimensions of the shape.
if (!inputShape.Any(x => x == 0))
{
int valCount = inputShape.Where(x => x > 0).Aggregate((x, y) => x * y);
// The column length should be divisible by this, so that the other dimensions can be integral.
int typeValueCount = type.GetValueCount();
if (typeValueCount % valCount != 0)
throw Contracts.Except($"Input shape mismatch: Input '{_parent.Inputs[i]}' has shape {String.Join(",", inputShape)}, but input data is of length {typeValueCount}.");
}
}
}
protected override DataViewSchema.DetachedColumn[] GetOutputColumnsCore()
{
var stdSuffix = ".output";
var info = new DataViewSchema.DetachedColumn[_parent.Outputs.Length];
for (int i = 0; i < _parent.Outputs.Length; i++)
{
var onnxOutputName = _parent.Outputs[i];
var columnName = onnxOutputName.EndsWith(stdSuffix) ? onnxOutputName.Replace(stdSuffix, "") : onnxOutputName;
var builder = new DataViewSchema.Annotations.Builder();
AddSlotNames(columnName, builder);
info[i] = new DataViewSchema.DetachedColumn(columnName, _parent.OutputTypes[i], builder.ToAnnotations());
}
return info;
}
private void AddSlotNames(string columnName, DataViewSchema.Annotations.Builder builder)
{
var graph = _parent.Model.Graph;
var nodes = graph.Node;
var slotNamesNodeName = $"mlnet.{columnName}.SlotNames";
var slotsNode = nodes.FirstOrDefault(node => node.Name == slotNamesNodeName);
var slotsAttr = slotsNode?.Attribute.FirstOrDefault(attr => attr.Name == "keys_strings");
if (slotsAttr == null)
return;
int count = slotsAttr.Strings.Count();
ValueGetter<VBuffer<ReadOnlyMemory<char>>> getter = (ref VBuffer<ReadOnlyMemory<char>> dst) =>
{
var dstEditor = VBufferEditor.Create(ref dst, count);
for (int i = 0; i < count; i++)
{
dstEditor.Values[i] = slotsAttr.Strings[i].ToString(Encoding.UTF8).AsMemory();
}
dst = dstEditor.Commit();
};
builder.AddSlotNames(count, getter);
}
private protected override Func<int, bool> GetDependenciesCore(Func<int, bool> activeOutput)
{
return col => Enumerable.Range(0, _parent.Outputs.Length).Any(i => activeOutput(i)) && _inputColIndices.Any(i => i == col);
}
private protected override void SaveModel(ModelSaveContext ctx) => _parent.SaveModel(ctx);
protected override Delegate MakeGetter(DataViewRow input, int iinfo, Func<int, bool> activeOutput, out Action disposer)
=> throw new NotImplementedException("This should never be called!");
private Delegate CreateGetter(DataViewRow input, int iinfo, Func<int, bool> activeOutput, OnnxRuntimeOutputCacher outputCacher)
{
Host.AssertValue(input);
var activeOutputColNames = _parent.Outputs.Where((x, i) => activeOutput(i)).ToArray();
if (_parent.Model.ModelInfo.OutputsInfo[_parent.MapDataViewColumnToOnnxOutputTensor(iinfo)].DataViewType is VectorDataViewType vectorType)
{
var elemRawType = vectorType.ItemType.RawType;
var srcNamedValueGetters = GetNamedOnnxValueGetters(input, _inputColIndices, _inputOnnxTypes, _inputTensorShapes);
if (vectorType.ItemType is TextDataViewType)
return MakeStringTensorGetter(input, iinfo, srcNamedValueGetters, activeOutputColNames, outputCacher);
else
return Utils.MarshalInvoke(MakeTensorGetter<int>, elemRawType, input, iinfo, srcNamedValueGetters, activeOutputColNames, outputCacher);
}
else
{
var type = _parent.Model.ModelInfo.OutputsInfo[_parent.MapDataViewColumnToOnnxOutputTensor(iinfo)].DataViewType.RawType;
var srcNamedValueGetters = GetNamedOnnxValueGetters(input, _inputColIndices, _inputOnnxTypes, _inputTensorShapes);
return Utils.MarshalInvoke(MakeObjectGetter<int>, type, input, iinfo, srcNamedValueGetters, activeOutputColNames, outputCacher);
}
}
public override Delegate[] CreateGetters(DataViewRow input, Func<int, bool> activeOutput, out Action disposer)
{
Contracts.Assert(input.Schema == InputSchema);
OnnxRuntimeOutputCacher outputCacher = new OnnxRuntimeOutputCacher();
int n = OutputColumns.Value.Length;
var result = new Delegate[n];
for (int i = 0; i < n; i++)
{
if (!activeOutput(i))
continue;
result[i] = CreateGetter(input, i, activeOutput, outputCacher);
}
disposer = () =>
{
outputCacher.Dispose();
};
return result;
}
private sealed class OnnxRuntimeOutputCacher : IDisposable
{
public long Position;
public Dictionary<string, DisposableNamedOnnxValue> Outputs;
public IDisposableReadOnlyCollection<DisposableNamedOnnxValue> OutputOnnxValues;
public OnnxRuntimeOutputCacher()
{
Position = -1;
Outputs = new Dictionary<string, DisposableNamedOnnxValue>();
}
private bool _isDisposed;
public void Dispose()
{
if (_isDisposed)
return;
OutputOnnxValues?.Dispose();
_isDisposed = true;
}
}
private void UpdateCacheIfNeeded(long position, INamedOnnxValueGetter[] srcNamedOnnxValueGetters, List<string> activeOutputColNames, OnnxRuntimeOutputCacher outputCache)
{
if (outputCache.Position != position)
{
var inputNameOnnxValues = new List<NamedOnnxValue>();
for (int i = 0; i < _inputColIndices.Length; i++)
{
inputNameOnnxValues.Add(srcNamedOnnxValueGetters[i].GetNamedOnnxValue());
}
outputCache.OutputOnnxValues?.Dispose();
outputCache.OutputOnnxValues = _parent.Model.Run(inputNameOnnxValues, activeOutputColNames);
Contracts.Assert(outputCache.OutputOnnxValues.Count > 0);
foreach (var outputNameOnnxValue in outputCache.OutputOnnxValues)
{
outputCache.Outputs[outputNameOnnxValue.Name] = outputNameOnnxValue;
}
outputCache.Position = position;
}
}
private Delegate MakeTensorGetter<T>(DataViewRow input, int iinfo, INamedOnnxValueGetter[] srcNamedValueGetters,
string[] activeOutputColNames, OnnxRuntimeOutputCacher outputCacher)
{
Host.AssertValue(input);
var listActiveOutputColumns = activeOutputColNames.ToList();
ValueGetter<VBuffer<T>> valueGetter = (ref VBuffer<T> dst) =>
{
UpdateCacheIfNeeded(input.Position, srcNamedValueGetters, listActiveOutputColumns, outputCacher);
var namedOnnxValue = outputCacher.Outputs[_parent.Outputs[iinfo]];
var tensor = namedOnnxValue.AsTensor<T>() as Microsoft.ML.OnnxRuntime.Tensors.DenseTensor<T>;
if (tensor == null)
throw Host.Except($"Output column {namedOnnxValue.Name} doesn't contain a DenseTensor of expected type {typeof(T)}");
var editor = VBufferEditor.Create(ref dst, (int)tensor.Length);
tensor.Buffer.Span.CopyTo(editor.Values);
dst = editor.Commit();
};
return valueGetter;
}
private Delegate MakeStringTensorGetter(DataViewRow input, int iinfo, INamedOnnxValueGetter[] srcNamedValueGetters,
string[] activeOutputColNames, OnnxRuntimeOutputCacher outputCacher)
{
Host.AssertValue(input);
var listActiveOutputColumns = activeOutputColNames.ToList();
ValueGetter<VBuffer<ReadOnlyMemory<char>>> valueGetter = (ref VBuffer<ReadOnlyMemory<char>> dst) =>
{
UpdateCacheIfNeeded(input.Position, srcNamedValueGetters, listActiveOutputColumns, outputCacher);
var namedOnnxValue = outputCacher.Outputs[_parent.Outputs[iinfo]];
var tensor = namedOnnxValue.AsTensor<string>() as Microsoft.ML.OnnxRuntime.Tensors.DenseTensor<string>;
if (tensor == null)
throw Host.Except($"Output column {namedOnnxValue.Name} doesn't contain a DenseTensor of expected type {typeof(string)}");
// Create VBufferEditor to fill "dst" with the values in "denseTensor".
var editor = VBufferEditor.Create(ref dst, (int)tensor.Length);
for (int i = 0; i < tensor.Length; ++i)
// Cast because string in ML.NET is typed to ReadOnlyMemory<char>.
editor.Values[i] = tensor.GetValue(i).AsMemory();
dst = editor.Commit();
};
return valueGetter;
}
private Delegate MakeObjectGetter<T>(DataViewRow input, int iinfo, INamedOnnxValueGetter[] srcNamedValueGetters,
string[] activeOutputColNames, OnnxRuntimeOutputCacher outputCacher)
{
Host.AssertValue(input);
var listActiveOutputColumns = activeOutputColNames.ToList();
ValueGetter<T> valueGetter = (ref T dst) =>
{
UpdateCacheIfNeeded(input.Position, srcNamedValueGetters, listActiveOutputColumns, outputCacher);
var namedOnnxValue = outputCacher.Outputs[_parent.Outputs[iinfo]];
var trueValue = namedOnnxValue.AsEnumerable<NamedOnnxValue>().Select(value => value.AsDictionary<string, float>());
var caster = _parent.Model.ModelInfo.OutputsInfo[_parent.MapDataViewColumnToOnnxOutputTensor(iinfo)].Caster;
dst = (T)caster(namedOnnxValue);
};
return valueGetter;
}
/// <summary>
/// Helper function to wrap ML.NET getters to produce ONNXRuntime variables.
/// For each required input of the ONNX model, there will be a <see cref="INamedOnnxValueGetter"/>,
/// which first invokes a ML.NET getter and casts the obtained value to <see cref="NamedOnnxValue"/>.
/// </summary>
private static INamedOnnxValueGetter[] GetNamedOnnxValueGetters(DataViewRow input,
int[] inputColIndices,
Type[] onnxInputTypes,
OnnxShape[] onnxInputShapes)
{
var srcNamedOnnxValueGetters = new INamedOnnxValueGetter[inputColIndices.Length];
for (int i = 0; i < inputColIndices.Length; i++)
{
int colIndex = inputColIndices[i];
var isVector = input.Schema[colIndex].Type is VectorDataViewType;
if (!isVector)
srcNamedOnnxValueGetters[i] = CreateNamedOnnxValueGetter(input, onnxInputTypes[i], colIndex, onnxInputShapes[i]);
else
srcNamedOnnxValueGetters[i] = CreateNamedOnnxValueGetterVec(input, onnxInputTypes[i], colIndex, onnxInputShapes[i]);
}
return srcNamedOnnxValueGetters;
}
/// <summary>
/// Wrap ML.NET getter to produce NamedOnnxValue. The wrapper is used to fetch non-vector ML.NET column and cast ML.NET column to
/// NamedOnnxValue which is consumable by ONNXRuntime.
/// </summary>
private static INamedOnnxValueGetter CreateNamedOnnxValueGetter(DataViewRow input, Type onnxType, int colIndex, OnnxShape onnxShape)
{
// This type is column type in ML.NET used to invoke ML.NET
// getter, so we use just use the type provided by the input's Schema.
// This function handles non-tensor types, so we directly access RawType.
// For tensor types, we need to do GetItemType().RawType.
var type = input.Schema[colIndex].Type.RawType;
Contracts.AssertValue(type);
return Utils.MarshalInvoke(CreateNamedOnnxValueGetterCore<int>, type, input, colIndex, onnxShape);
}
/// <summary>
/// Function needed by reflection in <see cref="CreateNamedOnnxValueGetter(DataViewRow, Type, int, OnnxShape)"/>.
/// </summary>
private static INamedOnnxValueGetter CreateNamedOnnxValueGetterCore<T>(DataViewRow input, int colIndex, OnnxShape onnxShape)
{
return new NameOnnxValueGetter<T>(input, colIndex);
}
/// <summary>
/// Wrap ML.NET getter to produce NamedOnnxValue. The wrapper is used to fetch vector-typed ML.NET column and cast ML.NET column to
/// NamedOnnxValue which is consumable by ONNXRuntime.
/// </summary>
private static INamedOnnxValueGetter CreateNamedOnnxValueGetterVec(DataViewRow input, Type onnxType, int colIndex, OnnxShape onnxShape)
{
// This type is column type in ML.NET used to invoke ML.NET
// getter, so we use just use the type provided by the input's Schema.
// This function handles tensor types, so we need to call GetItemType()
// to get the element type in VBuffer.
var type = input.Schema[colIndex].Type.GetItemType().RawType;
Contracts.AssertValue(type);
return Utils.MarshalInvoke(CreateNamedOnnxValueGetterVecCore<int>, type, input, colIndex, onnxShape);
}
/// <summary>
/// Function needed by reflection in <see cref="CreateNamedOnnxValueGetterVec(DataViewRow, Type, int, OnnxShape)"/>.
/// </summary>
private static INamedOnnxValueGetter CreateNamedOnnxValueGetterVecCore<T>(DataViewRow input, int colIndex, OnnxShape onnxShape)
{
return new NamedOnnxValueGetterVec<T>(input, colIndex, onnxShape);
}
/// <summary>
/// Common function for wrapping ML.NET getter as a NamedOnnxValue getter.
/// </summary>
private interface INamedOnnxValueGetter
{
NamedOnnxValue GetNamedOnnxValue();
}
private class NameOnnxValueGetter<T> : INamedOnnxValueGetter
{
private readonly ValueGetter<T> _srcGetter;
private readonly string _colName;
public NameOnnxValueGetter(DataViewRow input, int colIndex)
{
_colName = input.Schema[colIndex].Name;
_srcGetter = input.GetGetter<T>(input.Schema[colIndex]);
}
public NamedOnnxValue GetNamedOnnxValue()
{
var scalar = default(T);
_srcGetter(ref scalar);
return OnnxUtils.CreateScalarNamedOnnxValue(_colName, scalar);
}
}
private class NamedOnnxValueGetterVec<T> : INamedOnnxValueGetter
{
private delegate NamedOnnxValue GetNamedOnnxVal();
private readonly ValueGetter<VBuffer<T>> _srcGetter;
private readonly OnnxShape _tensorShape;
private readonly string _colName;
private VBuffer<T> _vBuffer;
private VBuffer<T> _vBufferDense;
private readonly int _denominator;
private readonly int _zeroIndex;
private readonly GetNamedOnnxVal _namedOnnxValueDelegate;
public NamedOnnxValueGetterVec(DataViewRow input, int colIndex, OnnxShape tensorShape)
{
_srcGetter = input.GetGetter<VBuffer<T>>(input.Schema[colIndex]);
_tensorShape = new OnnxShape(tensorShape);
_colName = input.Schema[colIndex].Name;
_vBuffer = default;
_vBufferDense = default;
_denominator = _tensorShape.Where(x => x > 0).Aggregate((a, x) => a * x);
_zeroIndex = _tensorShape.IndexOf(0);
var isKnownSize = (input.Schema[colIndex].Type as VectorDataViewType).IsKnownSize;
if (isKnownSize)
_namedOnnxValueDelegate = GetNamedOnnxValueKnownSize;
else
_namedOnnxValueDelegate = GetNamedOnnxValueUnknownSize;
}
public NamedOnnxValue GetNamedOnnxValue()
{
return _namedOnnxValueDelegate();
}
private void GetNamedOnnxValueCore()
{
_srcGetter(ref _vBuffer);
_vBuffer.CopyToDense(ref _vBufferDense);
}
private NamedOnnxValue GetNamedOnnxValueKnownSize()
{
GetNamedOnnxValueCore();
return OnnxUtils.CreateNamedOnnxValue(_colName, _vBufferDense.GetValues(), _tensorShape);
}
private NamedOnnxValue GetNamedOnnxValueUnknownSize()
{
GetNamedOnnxValueCore();
_tensorShape[_zeroIndex] = _vBufferDense.Length / _denominator;
return OnnxUtils.CreateNamedOnnxValue(_colName, _vBufferDense.GetValues(), _tensorShape);
}
}
}
}
/// <summary>
/// <see cref="IEstimator{TTransformer}"/> for scoring ONNX models in the ML.NET framework.
/// </summary>
/// <remarks>
/// <format type="text/markdown"><
///
/// Supports inferencing of models in ONNX 1.6 format (opset 11), using the [Microsoft.ML.OnnxRuntime](https://www.nuget.org/packages/Microsoft.ML.OnnxRuntime/) library.
/// Models are scored on CPU if the project references Microsoft.ML.OnnxRuntime and on the GPU if the project references Microsoft.ML.OnnxRuntime.Gpu.
/// Every project using the OnnxScoringEstimator must reference one of the above two packages.
///
/// To run on a GPU, use the
/// NuGet package [Microsoft.ML.OnnxRuntime.Gpu](https://www.nuget.org/packages/Microsoft.ML.OnnxRuntime.Gpu/) instead of the Microsoft.ML.OnnxRuntime nuget (which is for CPU processing). Microsoft.ML.OnnxRuntime.Gpu
/// requires a [CUDA supported GPU](https://developer.nvidia.com/cuda-gpus#compute), the [CUDA 10.2 Toolkit](https://developer.nvidia.com/cuda-downloads), and [cuDNN 8.0.3](https://developer.nvidia.com/cudnn) (as indicated on [Onnxruntime's documentation](https://github.com/Microsoft/onnxruntime#system-requirements)).
/// When creating the estimator through [ApplyOnnxModel](xref:Microsoft.ML.OnnxCatalog.ApplyOnnxModel*), set the parameter 'gpuDeviceId' to a valid non-negative integer. Typical device ID values are 0 or 1. If the GPU device isn't found but 'fallbackToCpu = true' then the estimator will run on the CPU. If the GPU device isn't found but 'fallbackToCpu = false' then the estimator will throw an exception
///
/// The inputs and outputs of the ONNX models must be Tensor type. Sequence and Maps are not yet supported.
///
/// Internally, OnnxTransformer (the return value of OnnxScoringEstimator.Fit()) holds a reference to an inference session which points to unmanaged memory owned by OnnxRuntime.dll.
/// Whenever there is a call to [ApplyOnnxModel](xref:Microsoft.ML.OnnxCatalog.ApplyOnnxModel*) in a pipeline, it is advised to cast the return value of the Fit() call to IDisposable and call Dispose() to ensure that there are no memory leaks.
///
/// OnnxRuntime works on Windows, MacOS and Ubuntu 16.04 Linux 64-bit platforms.
/// Visit [ONNX Models](https://github.com/onnx/models) to see a list of readily available models to get started with.
/// Refer to [ONNX](http://onnx.ai) for more information.
///
/// ]]>
/// </format>
/// </remarks>
public sealed class OnnxScoringEstimator : TrivialEstimator<OnnxTransformer>
{
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. All possible output columns are generated, with names/types
/// specified by model.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="modelFile">Model file path.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
[BestFriend]
internal OnnxScoringEstimator(IHostEnvironment env, string modelFile, int? gpuDeviceId = null, bool fallbackToCpu = false,
IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100)
: this(env, new OnnxTransformer(env, new string[] { }, new string[] { }, modelFile, gpuDeviceId, fallbackToCpu, shapeDictionary, recursionLimit))
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. All possible output columns are generated, with names/types
/// specified by model.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="modelBytes">Model as bytes.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
[BestFriend]
internal OnnxScoringEstimator(IHostEnvironment env, Stream modelBytes, int? gpuDeviceId = null, bool fallbackToCpu = false,
IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100)
: this(env, new OnnxTransformer(env, new string[] { }, new string[] { }, modelBytes, gpuDeviceId, fallbackToCpu, shapeDictionary, recursionLimit))
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. Only the output columns specified will be generated.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="outputColumnNames">The output columns to generate. Names must match model specifications. Data types are inferred from model.</param>
/// <param name="inputColumnNames">The name of the input data columns. Must match model's input names.</param>
/// <param name="modelFile">Model file path.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
/// <param name="interOpNumThreads">Controls the number of threads used to parallelize the execution of the graph (across nodes).</param>
/// <param name="intraOpNumThreads">Controls the number of threads to use to run the model.</param>
internal OnnxScoringEstimator(IHostEnvironment env, string[] outputColumnNames, string[] inputColumnNames, string modelFile,
int? gpuDeviceId = null, bool fallbackToCpu = false, IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100,
int? interOpNumThreads = null, int? intraOpNumThreads = null)
: this(env, new OnnxTransformer(env, outputColumnNames, inputColumnNames, modelFile, gpuDeviceId, fallbackToCpu, shapeDictionary, recursionLimit, interOpNumThreads, intraOpNumThreads))
{
}
internal OnnxScoringEstimator(IHostEnvironment env, OnnxTransformer transformer)
: base(Contracts.CheckRef(env, nameof(env)).Register(nameof(OnnxTransformer)), transformer)
{
}
/// <summary>
/// Transform for scoring ONNX models. Input data column names/types must exactly match
/// all model input names. Only the output columns specified will be generated.
/// </summary>
/// <param name="env">The environment to use.</param>
/// <param name="outputColumnNames">The output columns to generate. Names must match model specifications. Data types are inferred from model.</param>
/// <param name="inputColumnNames">The name of the input data columns. Must match model's input names.</param>
/// <param name="modelBytes">Model bytes in memory.</param>
/// <param name="gpuDeviceId">Optional GPU device ID to run execution on. Null for CPU.</param>
/// <param name="fallbackToCpu">If GPU error, raise exception or fallback to CPU.</param>
/// <param name="shapeDictionary"></param>
/// <param name="recursionLimit">Optional, specifies the Protobuf CodedInputStream recursion limit. Default value is 100.</param>
/// <param name="interOpNumThreads">Controls the number of threads used to parallelize the execution of the graph (across nodes).</param>
/// <param name="intraOpNumThreads">Controls the number of threads to use to run the model.</param>
internal OnnxScoringEstimator(IHostEnvironment env, string[] outputColumnNames, string[] inputColumnNames, Stream modelBytes,
int? gpuDeviceId = null, bool fallbackToCpu = false, IDictionary<string, int[]> shapeDictionary = null, int recursionLimit = 100,
int? interOpNumThreads = null, int? intraOpNumThreads = null)
: this(env, new OnnxTransformer(env, outputColumnNames, inputColumnNames, modelBytes, gpuDeviceId, fallbackToCpu, shapeDictionary, recursionLimit, interOpNumThreads, intraOpNumThreads))
{
}
/// <summary>
/// Returns the <see cref="SchemaShape"/> of the schema which will be produced by the transformer.
/// Used for schema propagation and verification in a pipeline.
/// </summary>
public override SchemaShape GetOutputSchema(SchemaShape inputSchema)
{
Host.CheckValue(inputSchema, nameof(inputSchema));
var result = inputSchema.ToDictionary(x => x.Name);
var resultDic = inputSchema.ToDictionary(x => x.Name);
// This loop checks if all input columns needed in the underlying transformer can be found
// in inputSchema.
// Since ML.NET can only produces tensors (scalars are converted to tensor with shape [1] before feeding
// ML.NET them into ONNXRuntime), the bridge code in ONNX Transformer assumes that all inputs are tensors.
for (var i = 0; i < Transformer.Inputs.Length; i++)
{
// Get the i-th IDataView input column's name in the underlying ONNX transformer.
var input = Transformer.Inputs[i];
// Only allow 1 unknown dimension
if (Transformer.Model.ModelInfo.InputsInfo[i].Shape.Where(x => x == 0).Count() > 1)
throw new ArgumentOutOfRangeException(input, "Only 1 unknown dimension is allowed");
// Make sure inputSchema contains the i-th input column.
if (!inputSchema.TryFindColumn(input, out var col))
throw Host.ExceptSchemaMismatch(nameof(inputSchema), "input", input);
var inputsInfo = Transformer.Model.ModelInfo.InputsInfo;
var idx = Transformer.Model.ModelInfo.InputNames.IndexOf(input);
if (idx < 0)
throw Host.Except($"Column {input} doesn't match input node names of model.");
var inputNodeInfo = inputsInfo[idx];
var expectedType = ((VectorDataViewType)inputNodeInfo.DataViewType).ItemType;
if (col.ItemType != expectedType)
throw Host.ExceptSchemaMismatch(nameof(inputSchema), "input", input, expectedType.ToString(), col.ItemType.ToString());
}
for (var i = 0; i < Transformer.Outputs.Length; i++)
{
resultDic[Transformer.Outputs[i]] = new SchemaShape.Column(Transformer.Outputs[i],
Transformer.OutputTypes[i].IsKnownSizeVector() ? SchemaShape.Column.VectorKind.Vector
: SchemaShape.Column.VectorKind.VariableVector, Transformer.OutputTypes[i].GetItemType(), false);
}
return new SchemaShape(resultDic.Values);
}
}
}
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