From 607c41952e78d8c5d489a75590204f802d392ee5 Mon Sep 17 00:00:00 2001
From: tensor-tang <tangjian03@baidu.com>
Date: Sun, 26 Aug 2018 16:10:45 +0800
Subject: [PATCH] compute gates

---
 paddle/fluid/operators/fusion_lstm_op.cc | 87 +++++++++++++++++++++++-
 1 file changed, 84 insertions(+), 3 deletions(-)

diff --git a/paddle/fluid/operators/fusion_lstm_op.cc b/paddle/fluid/operators/fusion_lstm_op.cc
index 870292827dc..604c6f18397 100644
--- a/paddle/fluid/operators/fusion_lstm_op.cc
+++ b/paddle/fluid/operators/fusion_lstm_op.cc
@@ -220,24 +220,105 @@ class FuisonLSTMKernel : public framework::OpKernel<T> {
   void SeqCompute(const framework::ExecutionContext& ctx) const {
     using DeviceContext = paddle::platform::CPUDeviceContext;
     auto* x = ctx.Input<LoDTensor>("X");
+    auto* h0 = ctx.Input<Tensor>("H0");
+    auto* c0 = ctx.Input<Tensor>("C0");
     auto* wx = ctx.Input<Tensor>("WeightX");
     auto* wh = ctx.Input<Tensor>("WeightH");
     auto* bias = ctx.Input<Tensor>("Bias");
 
     auto* xx = ctx.Output<LoDTensor>("XX");
+    auto* hidden_out = ctx.Output<LoDTensor>("Hidden");
+    auto* cell_out = ctx.Output<LoDTensor>("Cell");
 
-    auto x_dims = x->dims();    // T x M
-    auto wh_dims = wh->dims();  // D x 4D
-    const int M = x_dims[1];    // x frame size
+    auto x_lod = x->lod();
+    auto x_dims = x->dims();            // T x M
+    auto wh_dims = wh->dims();          // D x 4D
+    const int N = x_lod[0].size() - 1;  // batch size
+    const int M = x_dims[1];            // x frame size
+    const int D = wh_dims[0];
+    const int D2 = D * 2;
+    const int D3 = D * 3;
     const int D4 = wh_dims[1];
 
     const T* x_data = x->data<T>();
+    const T* h0_data = h0 ? h0->data<T>() : NULL;
+    const T* c0_data = c0 ? c0->data<T>() : NULL;
     const T* wx_data = wx->data<T>();
+    const T* wh_data = wh->data<T>();
     T* xx_data = xx->mutable_data<T>(ctx.GetPlace());
+    T* hidden_out_data = hidden_out->mutable_data<T>(ctx.GetPlace());
+    T* cell_out_data = cell_out->mutable_data<T>(ctx.GetPlace());
 
     auto blas = math::GetBlas<DeviceContext, T>(ctx);
     math::FCCompute<DeviceContext, T>(blas, x_dims[0], D4, M, x_data, wx_data,
                                       xx_data, bias->data<T>());
+
+    for (int i = 0; i < N; ++i) {
+      int seq_len = x_lod[0][i + 1] - x_lod[0][i];
+      const T* prev_cell_data = NULL;
+      const T* prev_hidden_data = NULL;
+      int tstart = 0;
+      if (h0_data) {
+        prev_hidden_data = h0_data + i * D;
+        prev_cell_data = c0_data + i * D;
+      } else {
+        // W_ch, W_ih, W_fh, W_oh
+        // actgate
+        math::vec_sigmoid<T>(D3, xx_data + D, xx_data + D);
+        // ch gate
+        math::vec_tanh<T>(D, xx_data, xx_data);
+        // cell out= input*tilde
+        blas.VMUL(D, xx_data, xx_data + D, cell_out_data);
+        // hidden out= act_state(cellout) * outgate
+        // act state
+        math::vec_tanh<T>(D, cell_out_data, xx_data + D2);
+        blas.VMUL(D, xx_data + D2, xx_data + D3, hidden_out_data);
+
+        // prev
+        prev_hidden_data = hidden_out_data;
+        prev_cell_data = cell_out_data;
+        tstart = 1;
+
+        // move offset
+        xx_data = xx_data + D4;
+        hidden_out_data = hidden_out_data + D;
+        cell_out_data = cell_out_data + D;
+      }
+      for (int step = tstart; step < seq_len; ++step) {
+        blas.GEMM(CblasNoTrans, CblasNoTrans, 1, D4, D, static_cast<T>(1),
+                  prev_hidden_data, D, wh_data, D4, static_cast<T>(1), xx_data,
+                  D4);
+
+        // W_ch, W_ih, W_fh, W_oh
+        // actgate
+        math::vec_sigmoid<T>(D3, xx_data + D, xx_data + D);
+        // ch gate
+        math::vec_tanh<T>(D, xx_data, xx_data);
+
+        // a = forget * prev_cell
+        blas.VMUL(D, xx_data + D2, prev_cell_data, xx_data + D2);
+
+        // b = input * tilde
+        blas.VMUL(D, xx_data, xx_data + D, xx_data + D);
+
+        // cell out= a+b
+        blas.VADD(D, xx_data + D, xx_data + D2, cell_out_data);
+
+        // hidden out= act_state(cellout) * outgate
+        // act state
+        math::vec_tanh<T>(D, cell_out_data, xx_data + D2);
+        blas.VMUL(D, xx_data + D2, xx_data + D3, hidden_out_data);
+
+        // prev
+        prev_hidden_data = hidden_out_data;
+        prev_cell_data = cell_out_data;
+
+        // move offset
+        xx_data = xx_data + D4;
+        hidden_out_data = hidden_out_data + D;
+        cell_out_data = cell_out_data + D;
+      }
+    }
   }
 
   void BatchCompute(const framework::ExecutionContext& ctx) const {
-- 
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