private void BuildModel(long docId, long keyId, AnalyzedString tokens)
{
var ix = GetOrCreateIndex(keyId);
foreach (var vector in tokens.Embeddings)
{
if (!VectorNodeWriter.Add(ix, new VectorNode(vector, docId), Similarity.Term))
{
_merges++;
}
}
}
public async Task CreateColumnSegment(VectorNode column, Stream vectorStream)
{
var time = Stopwatch.StartNew();
await _postingsWriter.Write(column);
var page = VectorNodeWriter.SerializeTree(column, _ixStream, vectorStream);
_ixStream.Flush();
_ixPageIndexWriter.Write(page.offset, page.length);
_ixPageIndexWriter.Flush();
var size = VectorNodeReader.Size(column);
this.Log("serialized column {0} in {1}. weight {2} depth {3} width {4} (avg depth {5})",
_keyId, time.Elapsed, column.Weight, size.depth, size.width, size.avgDepth);
}
public async Task Write(VectorNode rootNode)
{
var timer = Stopwatch.StartNew();
IList <VectorNode> nodes;
byte[] payload;
// create postings message
using (var message = new MemoryStream())
using (var lengths = new MemoryStream())
using (var offsets = new MemoryStream())
using (var documents = new MemoryStream())
{
// Write length of word (i.e. length of list of postings) to header stream,
// postings offsets to offset stream,
// and word itself to documents stream.
nodes = VectorNodeWriter.SerializePostings(rootNode, lengths, offsets, documents);
if (nodes.Count == 0)
{
return;
}
if (nodes.Count != lengths.Length / sizeof(int))
{
throw new DataMisalignedException();
}
// first word of message is payload count (i.e. num of postings lists)
await message.WriteAsync(BitConverter.GetBytes(nodes.Count));
// next are lengths
lengths.Position = 0;
await lengths.CopyToAsync(message);
// then all of the offsets
offsets.Position = 0;
await offsets.CopyToAsync(message);
// last are the document IDs
documents.Position = 0;
await documents.CopyToAsync(message);
var buf = message.ToArray();
var ctime = Stopwatch.StartNew();
var compressed = QuickLZ.compress(buf, 3);
this.Log(string.Format("compressing {0} bytes to {1} took {2}", buf.Length, compressed.Length, ctime.Elapsed));
payload = compressed;
}
this.Log(string.Format("create postings message took {0}", timer.Elapsed));
// send message, recieve list of (remote) file positions, save positions in index.
var positions = await Send(payload);
if (nodes.Count != positions.Count)
{
throw new DataMisalignedException();
}
timer.Restart();
for (int i = 0; i < nodes.Count; i++)
{
nodes[i].PostingsOffset = positions[i];
}
this.Log(string.Format("record postings offsets took {0}", timer.Elapsed));
}
