public ValueGetter <TValue> GetGetterCore <TValue>(int col, Action checkIsGood)
{
bool isSrc;
int index = _parent._bindings.MapColumnIndex(out isSrc, col);
if (isSrc)
{
return(_input.GetGetter <TValue>(index));
}
var appendedGetter = _appendedRow.GetGetter <TValue>(index);
return
((ref TValue value) =>
{
checkIsGood?.Invoke();
if (_lastServedPosition != _input.Position)
{
_input.FillValues(_src);
// REVIEW: what if this throws? Maybe swallow the exception?
_parent._mapAction(_src, _dst);
_lastServedPosition = _input.Position;
}
appendedGetter(ref value);
});
}
public Cursor(StatefulCustomMappingFilter <TSrc, TState> parent, DataViewRowCursor input, bool[] active)
: base(parent.Host, input, input.Schema, active)
{
Contracts.AssertValue(parent);
IRowReadableAs <TSrc> inputRow = parent.TypedSrc.GetRow(input);
TSrc src = new TSrc();
TState state = new TState();
parent._stateInitAction(state);
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
lastServedPosition = input.Position;
}
};
var predicate = parent._predicate;
_accept = () =>
{
refresh();
return(!predicate(src, state));
};
}
/// <summary>
/// Run prediction pipeline on one example.
/// </summary>
/// <param name="example">The example to run on.</param>
/// <param name="prediction">The object to store the prediction in. If it's <c>null</c>, a new one will be created, otherwise the old one
/// is reused.</param>
public void Predict(TSrc example, ref TDst prediction)
{
Contracts.CheckValue(example, nameof(example));
_inputRow.ExtractValues(example);
if (prediction == null)
{
prediction = new TDst();
}
_outputRow.FillValues(prediction);
}
/// <summary>
/// Run prediction pipeline on one example.
/// </summary>
/// <param name="example">The example to run on.</param>
/// <returns>The result of prediction. A new object is created for every call.</returns>
public TDst Predict(TSrc example)
{
Contracts.CheckValue(example, nameof(example));
_inputRow.ExtractValues(example);
if (_result == null)
{
_result = new TDst();
}
_outputRow.FillValues(_result);
return(_result);
}
public Cursor(RowToRowMapper parent, DataViewRowCursor input, bool[] active)
: base(parent.Host, input)
{
Ch.AssertValue(parent);
Ch.Assert(active == null || active.Length == parent.OutputSchema.Count);
_parent = parent;
_active = active;
_getters = new Delegate[parent._parent.AddedSchema.Columns.Length];
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(_parent.Host, _parent._parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _parent._typedSrc.GetRow(input);
TSrc src = new TSrc();
TState state = new TState();
TDst dst = new TDst();
_parent._parent._stateInitAction(state);
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._parent._mapAction(src, dst, state);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
for (int i = 0; i < active.Length; i++)
{
var iinfo = _parent._bindings.MapColumnIndex(out var isSrc, i);
if (isSrc)
{
continue;
}
_getters[iinfo] = Utils.MarshalInvoke(_parent.GetDstGetter <int>, _parent._bindings.Schema[i].Type.RawType, dstRow, _parent._bindings.Schema[i].Name, refresh);
}
}
public Delegate[] CreateGetters(IRow input, Func <int, bool> activeOutput, out Action disposer)
{
disposer = null;
// If no outputs are active, we short-circuit to empty array of getters.
var result = new Delegate[_parent.AddedSchema.Columns.Length];
if (!Enumerable.Range(0, result.Length).Any(activeOutput))
{
return(result);
}
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(_host, _parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _typedSrc.GetRow(input);
TSrc src = new TSrc();
TDst dst = new TDst();
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._mapAction(src, dst);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
for (int i = 0; i < result.Length; i++)
{
if (!activeOutput(i))
{
continue;
}
result[i] = Utils.MarshalInvoke(GetDstGetter <int>, dstRow.Schema[i].Type.RawType, dstRow, i, refresh);
}
return(result);
}
protected override Delegate[] CreateGetters(DataViewRow input, IEnumerable <DataViewSchema.Column> activeColumns, out Action disp)
{
disp = null;
var getters = new Delegate[_parent.AddedSchema.Columns.Length];
var dstRow = new DataViewConstructionUtils.InputRow <TDst>(Host, _parent.AddedSchema);
IRowReadableAs <TSrc> inputRow = _typedSrc.GetRow(input);
TSrc src = new TSrc();
TState state = new TState();
TDst dst = new TDst();
_parent._stateInitAction(state);
long lastServedPosition = -1;
Action refresh = () =>
{
if (lastServedPosition != input.Position)
{
inputRow.FillValues(src);
_parent._mapAction(src, dst, state);
dstRow.ExtractValues(dst);
lastServedPosition = input.Position;
}
};
foreach (var col in activeColumns)
{
var iinfo = _bindings.MapColumnIndex(out var isSrc, col.Index);
if (isSrc)
{
continue;
}
getters[iinfo] = Utils.MarshalInvoke(GetDstGetter <int>, col.Type.RawType, dstRow, col.Name, refresh);
}
return(getters);
}
protected void FillValues(TDst prediction) => _outputRow.FillValues(prediction);