static Matrix<char>* AllocateMatrix(const NDShape& viewShape, const DeviceDescriptor& device)
{
auto matrixDims = GetMatrixDimensions(viewShape);
auto maskMatrix = new Matrix<char>(matrixDims.first, matrixDims.second, AsCNTKImplDeviceId(device));
maskMatrix->SetValue(1);
return maskMatrix;
}
NDArrayViewPtr NDArrayView::RandomUniform(const NDShape& shape, double rangeStart, double rangeEnd, unsigned long seed, const DeviceDescriptor& device/* = DeviceDescriptor::DefaultDevice()*/)
{
auto matrixDims = GetMatrixDimensions(shape);
auto randomUniformMatrix = std::make_shared<Matrix<ElementType>>(Matrix<ElementType>::RandomUniform(matrixDims.first, matrixDims.second, AsCNTKImplDeviceId(device), (ElementType)rangeStart, (ElementType)rangeEnd, seed));
auto tensorView = new TensorView<ElementType>(randomUniformMatrix, AsTensorShape(shape));
auto view = new NDArrayView(AsDataType<ElementType>(), device, StorageFormat::Dense, shape, false, tensorView);
return NDArrayViewPtr(view, [](_ReferenceCounter* ptr) { delete ptr; });
}
ConstSubMatrix ToBoomMatrixView(SEXP m) {
if (!Rf_isMatrix(m)) {
report_error("ToBoomMatrix called with a non-matrix argument");
}
std::pair<int,int> dims = GetMatrixDimensions(m);
PROTECT(m = Rf_coerceVector(m, REALSXP));
ConstSubMatrix ans(REAL(m), dims.first, dims.second);
UNPROTECT(1);
return ans;
}
static TensorView<ElementType>* AllocateTensorView(const NDShape& viewShape,
CNTK::StorageFormat storageType,
const DeviceDescriptor& device)
{
auto matrixDims = GetMatrixDimensions(viewShape);
std::shared_ptr<Matrix<ElementType>> matrix = std::make_shared<Matrix<ElementType>>(matrixDims.first,
matrixDims.second,
AsCNTKImplDeviceId(device),
IsSparseStorageFormat(storageType) ? MatrixType::SPARSE : MatrixType::DENSE,
AsCNTKMatrixFormat(storageType));
return new TensorView<ElementType>(matrix, AsTensorShape(viewShape));
}
static TensorView<ElementType>* AllocateTensorView(const NDShape& viewShape,
const DeviceDescriptor& device,
void* dataBuffer,
size_t bufferSizeInBytes)
{
if (dataBuffer == nullptr)
InvalidArgument("Cannot create a NDArrayView over a null data buffer");
if (bufferSizeInBytes < (viewShape.TotalSize() * sizeof(ElementType)))
InvalidArgument("Size of the specified buffer for creating the NDArrayView is smaller than the specified view shape");
auto matrixDims = GetMatrixDimensions(viewShape);
std::shared_ptr<Matrix<ElementType>> matrix = std::make_shared<Matrix<ElementType>>(matrixDims.first, matrixDims.second, (ElementType*)dataBuffer, AsCNTKImplDeviceId(device), matrixFlagDontOwnBuffer);
return new TensorView<ElementType>(matrix, AsTensorShape(viewShape));
}