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);
}
});
}
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;
}
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);
});
}
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);
}
}
public override ValueGetter <RowId> GetIdGetter()
{
return(_trailingCursor.GetIdGetter());
}
public override ValueGetter <DataViewRowId> GetIdGetter()
{
return(_input.GetIdGetter());
}
public override ValueGetter <UInt128> GetIdGetter()
{
return(_trailingCursor.GetIdGetter());
}
public override ValueGetter <RowId> GetIdGetter()
{
return(_inputCursor.GetIdGetter());
}