Esempio n. 1
0
            public override ValueGetter <RowId> GetIdGetter()
            {
#if (DEBUG)
                Dictionary <RowId, int> localCache = new Dictionary <RowId, int>();
#endif
                // We do not change the ID (row to row transform).
                var getId = _inputCursor.GetIdGetter();
                return((ref RowId pos) =>
                {
                    getId(ref pos);
                    if (_shift > 0)
                    {
                        Contracts.Assert(_copy >= 0 && _copy <= _maxReplica);
                        ulong left = pos.Low << _shift;
                        left >>= _shift;
                        left = pos.Low - left;
                        ulong lo = pos.Low << _shift;
                        ulong hi = pos.High << _shift;
                        hi += left >> (64 - _shift);
                        pos = new RowId(lo + (ulong)_copy, hi);
#if (DEBUG)
                        if (localCache.ContainsKey(pos))
                        {
                            throw Contracts.Except("Id already taken: {0}", pos);
                        }
#endif
                    }
                    else
                    {
                        Contracts.Assert(_copy == 0);
                    }
                });
            }
Esempio n. 2
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            public ResampleCursor(ResampleTransform view, RowCursor cursor, Func <int, bool> predicate,
                                  float lambda, int?seed, Random rand, Dictionary <RowId, int> cache,
                                  int classColumn, TClass classValue)
            {
                _view        = view;
                _inputCursor = cursor;
                _lambda      = lambda;
                uint?useed = seed.HasValue ? (uint)seed.Value : (uint?)null;

                _rand = rand == null?RandomUtils.Create(useed) : rand;

                _predicate  = predicate;
                _cache      = cache;
                _maxReplica = cache == null?Math.Max((int)(lambda * 3 + 1), 1) : _cache.Values.Max();

                int maxReplica = _maxReplica + 1;

                _shift    = 0;
                _idGetter = cursor.GetIdGetter();
                while (maxReplica > 0)
                {
                    _shift      += 1;
                    maxReplica >>= 1;
                }
                _copy        = -1;
                _classValue  = classValue;
                _classGetter = classColumn >= 0 ? _inputCursor.GetGetter <TClass>(classColumn) : null;
            }
Esempio n. 3
0
            public override ValueGetter <RowId> GetIdGetter()
            {
                var getId = _inputCursor.GetIdGetter();

                return((ref RowId pos) =>
                {
                    getId(ref pos);
                });
            }
            public override ValueGetter <RowId> GetIdGetter()
            {
                // We do not change the ID (row to row transform).
                var getId = _inputCursor.GetIdGetter();

                return((ref RowId pos) =>
                {
                    getId(ref pos);
                });
            }
Esempio n. 5
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        void LoadCache <TClass>(Random rand, RowCursor cur, int classColumn, TClass valueClass, IChannel ch)
        {
            _cacheReplica = new Dictionary <RowId, int>();
            var    hist  = new Dictionary <TClass, long>();
            var    gid   = cur.GetIdGetter();
            var    gcl   = cur.GetGetter <TClass>(classColumn);
            RowId  did   = default(RowId);
            TClass cl    = default(TClass);
            long   nbIn  = 0;
            long   nbOut = 0;
            int    rep;

            while (cur.MoveNext())
            {
                gcl(ref cl);
                gid(ref did);
                if (!hist.ContainsKey(cl))
                {
                    hist[cl] = 1;
                }
                else
                {
                    ++hist[cl];
                }
                if (cl.Equals(valueClass))
                {
                    rep = NextPoisson(_args.lambda, rand);
                    ++nbIn;
                }
                else
                {
                    rep = 1;
                    ++nbOut;
                }
                _cacheReplica[did] = rep;
            }
            if (nbIn == 0)
            {
                ch.Warning(MessageSensitivity.UserData, "Resample on a condition never happened: nbIn={0} nbOut={1}", nbIn, nbOut);
            }
        }
Esempio n. 6
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 public override ValueGetter <RowId> GetIdGetter()
 {
     return(_trailingCursor.GetIdGetter());
 }
 public override ValueGetter <DataViewRowId> GetIdGetter()
 {
     return(_input.GetIdGetter());
 }
Esempio n. 8
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 public override ValueGetter <UInt128> GetIdGetter()
 {
     return(_trailingCursor.GetIdGetter());
 }
Esempio n. 9
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 public override ValueGetter <RowId> GetIdGetter()
 {
     return(_inputCursor.GetIdGetter());
 }