public void CreateNGram()
{
var ngram = new Ngram();
var words = ngram.Create("This a sentence of my test", 3);
CollectionAssert.AreEqual(words, new List <string> {
"This a sentence", "a sentence of", "sentence of my", "of my test"
});
}
public void CreateTfIdf()
{
var tfIdf = new DocumentTermFrequency();
var nGram = new Ngram();
var pdfParser = new PdfParser();
var reports = new Dictionary <string, List <string> >();
foreach (var file in Directory.EnumerateFiles("Pdf", "*.pdf"))
{
var fileName = Path.GetFileNameWithoutExtension(file);
var contents = pdfParser.GetText(file);
reports[fileName] = nGram.Create(contents, 3);
}
var result = tfIdf.Create(reports);
Assert.AreEqual(result.GetLength(0), 2);
Assert.AreEqual(result.GetLength(1), 7);
}
private void Proceed(string folderLocation, int nGramValue, string outputLocation, float threshold)
{
var pdfParser = new PdfParser();
var tfIdf = new DocumentTermFrequency();
var nGram = new Ngram();
var reports = new Dictionary <string, List <string> >();
foreach (var file in Directory.EnumerateFiles(folderLocation, "*.pdf"))
{
var fileName = Path.GetFileNameWithoutExtension(file);
var contents = pdfParser.GetText(file);
reports[fileName] = nGram.Create(contents, nGramValue);
}
var tfIdfMatrix = tfIdf.Create(reports);
var sw = new Stopwatch();
sw.Start();
Debug.WriteLine($"Create rowwise start.");
var sim = new Similarity().CreateRowWise(tfIdfMatrix);
Debug.WriteLine($"Create rowwise end ({sw.ElapsedMilliseconds} ms).");
// all report.
var strBuilder = new StringBuilder();
strBuilder.AppendLine("Roll,Similarity");
for (var r = 0; r < sim.GetLength(0); r++)
{
var line = "";
for (var c = 0; c < sim.GetLength(1); c++)
{
if (sim[r, c] > threshold)
{
line += $"{reports.Keys.ElementAt(c)}={Math.Round(sim[r, c] * 100, 2)}%,";
}
}
if (!string.IsNullOrEmpty(line))
{
var idx = line.LastIndexOf(',');
if (idx >= 0)
{
line = line.Substring(0, line.Length - 1);
}
}
strBuilder.AppendLine($"\"{reports.Keys.ElementAt(r)}\",\"{line}\"");
}
var output = $"{outputLocation}/Plagiarism_Output{DateTime.Now:yyyy-dd-M--HH-mm-ss}.csv";
File.WriteAllBytes(output, Encoding.UTF8.GetBytes(strBuilder.ToString()));
Process.Start(output);
}