public void CacheWithSeekerSetup()
{
var col = _cacheDataView.Schema.GetColumnOrNull("A").Value;
_seeker = ((IRowSeekable)_cacheDataView).GetSeeker(colIndex => colIndex == col.Index);
_getter = _seeker.GetGetter <int>(col.Index);
}
public void Setup()
{
var ctx = new MLContext(1);
var builder = new ArrayDataViewBuilder(ctx);
int[] values = new int[Length];
for (int i = 0; i < values.Length; ++i)
{
values[i] = i;
}
builder.AddColumn("A", NumberDataViewType.Int32, values);
var dv = builder.GetDataView();
var cacheDv = ctx.Data.Cache(dv);
var col = cacheDv.Schema.GetColumnOrNull("A").Value;
// First do one pass through.
using (var cursor = cacheDv.GetRowCursor(col))
{
var getter = cursor.GetGetter <int>(col);
int val = 0;
int count = 0;
while (cursor.MoveNext())
{
getter(ref val);
if (val != cursor.Position)
{
throw new Exception($"Unexpected value {val} at {cursor.Position}");
}
count++;
}
if (count != Length)
{
throw new Exception($"Expected {Length} values in cache but only saw {count}");
}
}
_cacheDataView = cacheDv;
// Only needed for seeker, but may as well set it.
_positions = new long[Length];
var rand = new Random(0);
for (int i = 0; i < _positions.Length; ++i)
{
_positions[i] = rand.Next(Length);
}
_col = _cacheDataView.Schema["A"];
_seeker = ((IRowSeekable)_cacheDataView).GetSeeker(colIndex => colIndex == _col.Index);
_seekerGetter = _seeker.GetGetter <int>(_col);
}