protected SlidingWindowTransformBase(Arguments args, string loaderSignature, IHostEnvironment env, IDataView input)
: base(args.WindowSize + args.Lag - 1, args.WindowSize + args.Lag - 1, args.Name, args.Source, loaderSignature, env, input)
{
Host.CheckUserArg(args.WindowSize >= 1, nameof(args.WindowSize), "Must be at least 1.");
Host.CheckUserArg(args.Lag >= 0, nameof(args.Lag), "Must be positive.");
if (args.Lag == 0 && args.WindowSize <= 1)
{
Host.Assert(args.WindowSize == 1);
throw Host.ExceptUserArg(nameof(args.Lag),
$"If {args.Lag}=0 and {args.WindowSize}=1, the transform just copies the column. Use {ColumnCopyingTransformer.LoaderSignature} transform instead.");
}
Host.CheckUserArg(Enum.IsDefined(typeof(BeginOptions), args.Begin), nameof(args.Begin), "Undefined value.");
_lag = args.Lag;
_begin = args.Begin;
_nanValue = GetNaValue();
}
protected SlidingWindowTransformBase(IHostEnvironment env, ModelLoadContext ctx, string loaderSignature, IDataView input)
: base(env, ctx, loaderSignature, input)
{
// *** Binary format ***
// <base>
// Int32 lag
// byte begin
Host.CheckDecode(WindowSize >= 1);
_lag = ctx.Reader.ReadInt32();
Host.CheckDecode(_lag >= 0);
byte r = ctx.Reader.ReadByte();
Host.CheckDecode(Enum.IsDefined(typeof(BeginOptions), r));
_begin = (BeginOptions)r;
_nanValue = GetNaValue();
}