public WeightMatrix Step(WeightMatrix context, WeightMatrix input, ComputeGraph innerGraph)
{
var hidden_prev = ht;
var cell_prev = ct;
var cell = this;
var h0 = innerGraph.mul(input, cell.Wix);
var h1 = innerGraph.mul(hidden_prev, cell.Wih);
var h11 = innerGraph.mul(context, cell.WiC);
var input_gate = innerGraph.sigmoid(
innerGraph.add(innerGraph.add(innerGraph.add(h0, h1), h11), cell.bi));
var h2 = innerGraph.mul(input, cell.Wfx);
var h3 = innerGraph.mul(hidden_prev, cell.Wfh);
var h33 = innerGraph.mul(context, cell.WfC);
var forget_gate = innerGraph.sigmoid(
innerGraph.add(innerGraph.add(innerGraph.add(h3, h2), h33),
cell.bf
)
);
var h4 = innerGraph.mul(input, cell.Wox);
var h5 = innerGraph.mul(hidden_prev, cell.Woh);
var h55 = innerGraph.mul(context, cell.WoC);
var output_gate = innerGraph.sigmoid(
innerGraph.add(
innerGraph.add(innerGraph.add(h5, h4), h55),
cell.bo
)
);
var h6 = innerGraph.mul(input, cell.Wcx);
var h7 = innerGraph.mul(hidden_prev, cell.Wch);
var h77 = innerGraph.mul(context, cell.WcC);
var cell_write = innerGraph.tanh(
innerGraph.add(
innerGraph.add(innerGraph.add(h7, h6), h77),
cell.bc
)
);
// compute new cell activation
var retain_cell = innerGraph.eltmul(forget_gate, cell_prev); // what do we keep from cell
var write_cell = innerGraph.eltmul(input_gate, cell_write); // what do we write to cell
var cell_d = innerGraph.add(retain_cell, write_cell); // new cell contents
// compute hidden state as gated, saturated cell activations
var hidden_d = innerGraph.eltmul(output_gate, innerGraph.tanh(cell_d));
this.ht = hidden_d;
this.ct = cell_d;
return(ht);
}
public void Reset()
{
ht = new WeightMatrix(1, hdim, 0);
ct = new WeightMatrix(1, hdim, 0);
}