public static VectorNode DeserializeNode(
long vecOffset,
long postingsOffset,
long componentCount,
long weight,
long terminator,
Stream vectorStream,
IDistanceCalculator model)
{
var vector = VectorOperations.DeserializeVector(vecOffset, (int)componentCount, model.NumOfDimensions, vectorStream);
var node = new VectorNode(postingsOffset, vecOffset, terminator, weight, vector);
return(node);
}
public static VectorNode DeserializeNode(
long vecOffset,
long postingsOffset,
long componentCount,
long weight,
long terminator,
Stream vectorStream,
IVectorSpaceConfig model)
{
var vector = VectorOperations.DeserializeVector(vecOffset, (int)componentCount, model.VectorWidth, vectorStream);
var node = new VectorNode(postingsOffset, vecOffset, terminator, weight, vector);
return(node);
}
/// <summary>
/// Persist tree to disk.
/// </summary>
/// <param name="node">Tree to perist.</param>
/// <param name="indexStream">stream to perist tree into</param>
/// <param name="vectorStream">stream to persist vectors in</param>
/// <param name="postingsStream">optional stream to persist any posting references into</param>
/// <returns></returns>
public static (long offset, long length) SerializeTree(
VectorNode node,
Stream indexStream,
Stream vectorStream,
Stream postingsStream = null)
{
var stack = new Stack <VectorNode>();
var offset = indexStream.Position;
var length = 0;
if (node.ComponentCount == 0)
{
node = node.Right;
}
while (node != null)
{
if (node.PostingsOffset == -1 && postingsStream != null)
{
SerializePostings(node, postingsStream);
}
node.VectorOffset = VectorOperations.SerializeVector(node.Vector, vectorStream);
SerializeNode(node, indexStream);
length += VectorNode.BlockSize;
if (node.Right != null)
{
stack.Push(node.Right);
}
node = node.Left;
if (node == null && stack.Count > 0)
{
node = stack.Pop();
}
}
return(offset, length);
}