Ejemplo n.º 1
0
 /**
  * Creates a new ValueArray with classes. New ValueArray is not aligned with source one
  * unfortunately so have to send results to each chunk owner using Atomic.
  */
 @Override
 public void map(Key key) {
   assert key.home();
   if (Job.isRunning(_job.self())) {
     ValueArray va = DKV.get(_arykey).get();
     AutoBuffer bits = va.getChunk(key);
     long startRow = va.startRow(ValueArray.getChunkIndex(key));
     int rows = va.rpc(ValueArray.getChunkIndex(key));
     int rpc = (int) (ValueArray.CHUNK_SZ / ROW_SIZE);
     long chunk = ValueArray.chknum(startRow, va.numRows(), ROW_SIZE);
     long updatedChk = chunk;
     long updatedRow = startRow;
     double[] values = new double[_cols.length - 1];
     ClusterDist cd = new ClusterDist();
     int[] clusters = new int[rows];
     int count = 0;
     for (int row = 0; row < rows; row++) {
       KMeans.datad(va, bits, row, _cols, _normalized, values);
       KMeans.closest(_clusters, values, cd);
       chunk = ValueArray.chknum(startRow + row, va.numRows(), ROW_SIZE);
       if (chunk != updatedChk) {
         updateClusters(clusters, count, updatedChk, va.numRows(), rpc, updatedRow);
         updatedChk = chunk;
         updatedRow = startRow + row;
         count = 0;
       }
       clusters[count++] = cd._cluster;
     }
     if (count > 0) updateClusters(clusters, count, chunk, va.numRows(), rpc, updatedRow);
     _job.updateProgress(1);
   }
   _job = null;
   _arykey = null;
   _cols = null;
   _clusters = null;
 }
Ejemplo n.º 2
0
 @Override
 public void map(Key key) {
   _rows = new long[_clusters.length];
   _dist = new double[_clusters.length];
   assert key.home();
   ValueArray va = DKV.get(_arykey).get();
   AutoBuffer bits = va.getChunk(key);
   int rows = va.rpc(ValueArray.getChunkIndex(key));
   double[] values = new double[_cols.length - 1];
   ClusterDist cd = new ClusterDist();
   for (int row = 0; row < rows; row++) {
     KMeans.datad(va, bits, row, _cols, _normalized, values);
     KMeans.closest(_clusters, values, cd);
     _rows[cd._cluster]++;
     _dist[cd._cluster] += cd._dist;
   }
   _arykey = null;
   _cols = null;
   _clusters = null;
 }
Ejemplo n.º 3
0
  /**
   * Map function for distributed parsing of the CSV files.
   *
   * <p>In first phase it calculates the min, max, means, encodings and other statistics about the
   * dataset, determines the number of columns.
   *
   * <p>The second pass then encodes the parsed dataset to the result key, splitting it into equal
   * sized chunks.
   */
  @Override
  public void map(Key key) {
    try {
      Key aryKey = null;
      boolean arraylet = key._kb[0] == Key.ARRAYLET_CHUNK;
      boolean skipFirstLine = _skipFirstLine;
      if (arraylet) {
        aryKey = ValueArray.getArrayKey(key);
        _chunkId = ValueArray.getChunkIndex(key);
        skipFirstLine = skipFirstLine || (ValueArray.getChunkIndex(key) != 0);
      }
      switch (_phase) {
        case ONE:
          assert (_ncolumns != 0);
          // initialize the column statistics
          phaseOneInitialize();
          // perform the parse
          CsvParser p = new CsvParser(aryKey, _ncolumns, _sep, _decSep, this, skipFirstLine);
          p.parse(key);
          if (arraylet) {
            long idx = ValueArray.getChunkIndex(key);
            int idx2 = (int) idx;
            assert idx2 == idx;
            assert (_nrows[idx2] == 0)
                : idx
                    + ": "
                    + Arrays.toString(_nrows)
                    + " ("
                    + _nrows[idx2]
                    + " -- "
                    + _myrows
                    + ")";
            _nrows[idx2] = _myrows;
          }
          break;
        case TWO:
          assert (_ncolumns != 0);
          // initialize statistics - invalid rows, sigma and row size
          phaseTwoInitialize();
          // calculate the first row and the number of rows to parse
          int firstRow = 0;
          int lastRow = _myrows;
          _myrows = 0;
          if (arraylet) {
            long origChunkIdx = ValueArray.getChunkIndex(key);
            firstRow = (origChunkIdx == 0) ? 0 : _nrows[(int) origChunkIdx - 1];
            lastRow = _nrows[(int) origChunkIdx];
          }
          int rowsToParse = lastRow - firstRow;
          // create the output streams
          _outputStreams2 = createRecords(firstRow, rowsToParse);
          assert (_outputStreams2.length > 0);
          _ab = _outputStreams2[0].initialize();
          // perform the second parse pass
          CsvParser p2 = new CsvParser(aryKey, _ncolumns, _sep, _decSep, this, skipFirstLine);
          p2.parse(key);
          // store the last stream if not stored during the parse
          if (_ab != null) _outputStreams2[_outputIdx].store();
          break;
        default:
          assert (false);
      }

      ParseStatus.update(_resultKey, DKV.get(key).length(), _phase);
    } catch (Exception e) {
      e.printStackTrace();
      _error = e.getMessage();
    }
  }