static (TorchTensor, TorchTensor) GetBatch(TorchTensor source, int index, int bptt)
{
var len = Math.Min(bptt, source.shape[0] - 1 - index);
var data = source[TorchTensorIndex.Slice(index, index + len)];
var target = source[TorchTensorIndex.Slice(index + 1, index + 1 + len)].reshape(-1);
return(data, target);
}
public PositionalEncoding(long dmodel, double dropout, int maxLen = 5000) : base("PositionalEncoding")
{
this.dropout = Dropout(dropout);
var pe = Float32Tensor.zeros(new long[] { maxLen, dmodel });
var position = Float32Tensor.arange(0, maxLen, 1).unsqueeze(1);
var divTerm = (Float32Tensor.arange(0, dmodel, 2) * (-Math.Log(10000.0) / dmodel)).exp();
pe[TorchTensorIndex.Ellipsis, TorchTensorIndex.Slice(0, null, 2)] = (position * divTerm).sin();
pe[TorchTensorIndex.Ellipsis, TorchTensorIndex.Slice(1, null, 2)] = (position * divTerm).cos();
this.pe = pe.unsqueeze(0).transpose(0, 1);
RegisterComponents();
}
public override TorchTensor forward(TorchTensor t)
{
var x = t + pe[TorchTensorIndex.Slice(null, t.shape[0]), TorchTensorIndex.Slice()];
return(dropout.forward(x));
}