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Fast file parser
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public class DataLoader
{
public void Load(string filePath, int wordVectorLength, int capacity = 1_200_000)
{
_wordVectorLength = wordVectorLength;
_wordVectors = new float[capacity, wordVectorLength];
_word2Index = new Dictionary<string, int>(capacity, StringComparer.InvariantCultureIgnoreCase);
var updateDict = new ActionBlock<(string word, int pos)>(x =>
{
if (_word2Index.ContainsKey(x.word))
return;
_word2Index.Add(x.word, x.pos);
});
var actionBlock = new ActionBlock<(string line, int pos)>(x =>
{
var ind = x.line.IndexOf(' ');
var word = x.line.Substring(0, ind);
var span = x.line.AsSpan();
for (var i = 0; i < wordVectorLength; i++)
{
while (span[ind] == ' ') ind++;
var pos = ind;
while (pos < span.Length && span[pos] != ' ') pos++;
var s = span.Slice(ind, pos - ind);
_wordVectors[x.pos, i] = float.Parse(s);
ind = pos;
}
updateDict.Post((word, x.pos));
}, new ExecutionDataflowBlockOptions
{
MaxDegreeOfParallelism = Environment.ProcessorCount
});
using var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
using var bufferedStream = new BufferedStream(fileStream);
using var streamReader = new StreamReader(bufferedStream, Encoding.UTF8);
string line;
var position = 0;
while ((line = streamReader.ReadLine()) != null)
actionBlock.Post((line, position++));
actionBlock.Complete();
actionBlock.Completion.GetAwaiter().GetResult();
}
private int _wordVectorLength;
private float[,] _wordVectors;
private Dictionary<string, int> _word2Index;
}
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