/// <summary>
/// Create Value object from dense input as batch of sequences data with sequenceStartFlags.
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="sampleShape">data shape</param>
/// <param name="sequences">data sequence</param>
/// <param name="sequenceStartFlag">true indicates that it is a new sequence.
/// false means a continuation of a previous sequence.</param>
/// <param name="device">device</param>
/// <param name="readOnly">whether it a readonly value</param>
/// <returns></returns>
public static Value Create <T>(NDShape sampleShape,
IEnumerable <IEnumerable <T> > sequences,
IEnumerable <bool> sequenceStartFlags,
DeviceDescriptor device,
bool readOnly = false)
{
var seqFlags = Helper.AsBoolVector(sequenceStartFlags);
if (typeof(T).Equals(typeof(float)))
{
var inputAsSequencesVector = new FloatVectorVector();
foreach (var seq in sequences)
{
var seqVector = Helper.AsFloatVector(seq);
// The seqVector is copied when adding to inputAsSequencesVector.
inputAsSequencesVector.Add(seqVector);
}
return(Value._CreateDenseFloat(sampleShape, inputAsSequencesVector, seqFlags, device, readOnly));
}
else if (typeof(T).Equals(typeof(double)))
{
var inputAsSequencesVector = new DoubleVectorVector();
foreach (var seq in sequences)
{
var seqVector = Helper.AsDoubleVector(seq);
inputAsSequencesVector.Add(seqVector);
}
return(Value._CreateDenseDouble(sampleShape, inputAsSequencesVector, seqFlags, device, readOnly));
}
else
{
throw new ArgumentException("The data type " + typeof(T).ToString() + " is not supported. Only float or double is supported by CNTK.");
}
}
// Create Value based on dense input
// Todo: could this be a extension to Value class??
// Todo: use Variable instead of varName. VarName as extension method
// Todo: List can have maximal 2^31-1, enough? Otherwise need to go to array which supports 64bit size
public Value CreateValue <T>(string varName, List <List <T> > sequences, DeviceDescriptor computeDevice)
{
var variable = getVariableByName(varName);
var dim = variable.Shape.TotalSize;
if (typeof(T).Equals(typeof(float)))
{
var inputSeqVector = new FloatVectorVector();
foreach (var seq in sequences)
{
if (seq.Count() % dim != 0)
{
throw new InvalidDataException("the number of data in sequences does not match the input dimension");
}
var samples = new FloatVector(seq);
inputSeqVector.Add(samples);
}
var inputValue = Value.CreateDenseFloat(variable.Shape, inputSeqVector, computeDevice);
return(inputValue);
}
else if (typeof(T).Equals(typeof(double)))
{
var inputSeqVector = new DoubleVectorVector();
foreach (var seq in sequences)
{
if (seq.Count() % dim != 0)
{
throw new InvalidDataException("the number of data in sequences does not match the input dimension");
}
var samples = new DoubleVector(seq);
inputSeqVector.Add(samples);
}
var inputValue = Value.CreateDenseDouble(variable.Shape, inputSeqVector, computeDevice);
return(inputValue);
}
else
{
throw new InvalidDataException("The data type " + typeof(T).ToString() + " is not supported. Only float or double is supported by CNTK.");
}
}
