private static OrtValue CreateStringTensor(Tensor <string> tensor)
{
if (tensor == null)
{
throw new OnnxRuntimeException(ErrorCode.Fail, "Cast to Tensor<string> failed. BUG check!");
}
int totalLength = 0;
for (int i = 0; i < tensor.Length; i++)
{
totalLength += System.Text.Encoding.UTF8.GetByteCount(tensor.GetValue(i));
}
long[] shape = new long[tensor.Dimensions.Length];
for (int i = 0; i < tensor.Dimensions.Length; i++)
{
shape[i] = tensor.Dimensions[i];
}
// allocate the native tensor
IntPtr valueHandle = IntPtr.Zero;
NativeApiStatus.VerifySuccess(NativeMethods.OrtCreateTensorAsOrtValue(
OrtAllocator.DefaultInstance.Pointer,
shape,
(UIntPtr)(shape.Length),
TensorElementType.String,
out valueHandle
));
var ortValue = new OrtValue(valueHandle);
try
{
// fill the native tensor, using GetValue(index) from the Tensor<string>
var len = tensor.Length;
var nativeStrings = new IntPtr[len];
using (var pinnedHandles = new DisposableList <PinnedGCHandle>((int)len))
{
for (int i = 0; i < len; i++)
{
var utf8str = NativeOnnxValueHelper.StringToZeroTerminatedUtf8(tensor.GetValue(i));
var gcHandle = GCHandle.Alloc(utf8str, GCHandleType.Pinned);
nativeStrings[i] = gcHandle.AddrOfPinnedObject();
pinnedHandles.Add(new PinnedGCHandle(gcHandle));
}
using (var pinnedStrings = new PinnedGCHandle(GCHandle.Alloc(nativeStrings, GCHandleType.Pinned)))
NativeApiStatus.VerifySuccess(NativeMethods.OrtFillStringTensor(ortValue.Handle, nativeStrings, (UIntPtr)len));
}
}
catch (OnnxRuntimeException)
{
ortValue.Dispose();
throw;
}
return(ortValue);
}
protected override void Dispose(bool disposing)
{
if (IsDisposed)
{
return;
}
if (_ortValue != null)
{
_ortValue.Dispose();
_ortValue = null;
}
IsDisposed = true;
}
protected virtual void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
// dispose managed state (managed objects).
if (disposing)
{
if (_disposables != null)
{
_disposables.Dispose();
_disposables = null;
}
// _ortValueHolder can be null when no native memory is involved
if (_ortValue != null)
{
_ortValue.Dispose();
_ortValue = null;
}
_disposed = true;
}
}