add backward

paddle/operators/hierarchical_sigmoid_op.h

@@ -44,9 +44,9 @@ class HierarchicalSigmoidOpKernel : public framework::OpKernel<T> {
 
     auto pre_out_mat = EigenMatrix<T>::From(pre_out);
     int64_t batch_size = ins[0]->dims()[0];
-    int64_t size = ins.size();
+    int64_t code_length = math::FindLastSet(num_classes - 1);
 
-    std::vector<int64_t> pre_out_dims({batch_size, size});
+    std::vector<int64_t> pre_out_dims({batch_size, code_length});
     pre_out.mutable_data<T>(framework::make_ddim(pre_out_dims), ctx.GetPlace());
     std::vector<int64_t> sum_dims({batch_size, 1UL});
     sum.mutable_data<T>(framework::make_ddim(sum_dims), ctx.GetPlace());
@@ -64,8 +64,11 @@ class HierarchicalSigmoidOpKernel : public framework::OpKernel<T> {
         pre_out_mat.abs().cwiseMax(static_cast<T>(40.0));
     math::SumByBitCode<T>(num_classes, *label, *out, pre_out,
                           static_cast<T>(-1));
-    // softrelu
-    pre_out_mat.device(place) = (static_cast<T>(1) + pre_out_mat.exp()).log();
+
+    // softrelu with threshold is 40.0
+    pre_out_mat.device(place) =
+        pre_out_mat.abs().cwiseMax(static_cast<T>(40.0));
+    pre_out_mat.device(place) = (static_cast<T>(1.0) + pre_out_mat.exp()).log();
 
     row_sum(device_ctx, pre_out, &sum);
     col_sum(device_ctx, *out, &sum);
@@ -75,7 +78,46 @@ class HierarchicalSigmoidOpKernel : public framework::OpKernel<T> {
 template <typename Place, typename T>
 class HierarchicalSigmoidGradOpKernel : public framework::OpKernel<T> {
  public:
-  void Compute(const framework::ExecutionContext& ctx) const override {}
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto ins = ctx.MultiInput<framework::Tensor>("X");
+    auto ins_grad =
+        ctx.MultiOutput<framework::Tensor>(framework::GradVarName("X"));
+    auto params = ctx.MultiOutput<framework::Tensor>(
+        framework::GradVarName("Parameters"));
+    auto* bias = ctx.Output<framework::Tensor>(framework::GradVarName("Bias"));
+    auto* label =
+        ctx.Output<framework::Tensor>(framework::GradVarName("Label"));
+    size_t num_classes = static_cast<size_t>(ctx.Attr<int>("num_classes"));
+
+    framework::Tensor pre_out;
+    auto place = ctx.GetEigenDevice<Place>();
+    auto& dev_ctx = ctx.device_context();
+    int64_t batch_size = ins_grad.size();
+    int64_t code_length = math::FindLastSet(num_classes - 1);
+    auto pre_out_mat = EigenMatrix<T>::From(pre_out);
+
+    // init pre_out matrix with {1.0}
+    std::vector<int64_t> pre_out_dims({batch_size, code_length});
+    pre_out.mutable_data<T>(framework::make_ddim(pre_out_dims), ctx.GetPlace());
+    math::SetConstant<Place, T> set;
+    set(dev_ctx, &pre_out, static_cast<T>(1.0));
+    // softrelu derivative
+    pre_out_mat.device(place) =
+        pre_out_mat * (static_cast<T>(1.0) - static_cast<T>(1.0) / pre_out_mat);
+
+    math::SubByBitCode<T>(num_classes, *label, pre_out);
+
+    if (bias) {
+      math::AddByBitCodeGrad<T>(num_classes, *label, pre_out, *bias);
+    }
+
+    for (size_t i = 0; i < ins_grad.size(); ++i) {
+      math::MulByBitCodeGradWeight<T>(num_classes, *label, pre_out, *params[i],
+                                      *ins[i]);
+      math::MulByBitCodeGradError<T>(num_classes, *label, pre_out, *params[i],
+                                     *ins_grad[i]);
+    }
+  }
 };
 
 }  // namespace operators

paddle/operators/math/matrix_bit_code.cc

@@ -69,19 +69,23 @@ static void AddByBitCodeT(Op op, CodeTable code_table,
   }
 }
 
-/* For j < codeLength:
-   a(i, j) += b(0, index(i, j))
-*/
 template <typename T>
 void AddByBitCode(size_t num_classes, const framework::Tensor& codes,
-                  framework::Tensor& a, const framework::Tensor& b) {
+                  framework::Tensor& tmat, const framework::Tensor& vec) {
   auto op = [](T& t, T& v) { t += v; };
-  AddByBitCodeT<T>(op, SimpleCodeTable(num_classes), codes, a, b);
+  AddByBitCodeT<T>(op, SimpleCodeTable(num_classes), codes, tmat, vec);
+}
+
+template <typename T>
+void AddByBitCodeGrad(size_t num_classes, const framework::Tensor& codes,
+                      const framework::Tensor& tmat, framework::Tensor& vec) {
+  auto op = [](T& t, T& v) { v += t; };
+  AddByBitCode<T>(op, SimpleCodeTable(num_classes), codes, tmat, vec);
 }
 
 template <class CodeTable, typename T>
 void SumByBitCodeT(CodeTable code_table, const framework::Tensor& codes,
-                   framework::Tensor& tmat, framework::Tensor& sum,
+                   framework::Tensor& tmat, const framework::Tensor& sum,
                    const T& scale_sum) {
   size_t max_code_length = code_table.get_max_code_length();
   size_t num_samples = tmat.dims()[0];
@@ -142,8 +146,61 @@ void MulByBitCode(size_t num_classes, const framework::Tensor& codes,
     }
     t += sum;
   };
-  MulByBitCode(op, SimpleCodeTable(num_classes), codes, tmat, weight, input);
+  MulByBitCodeT<T>(op, SimpleCodeTable(num_classes), codes, tmat, weight,
+                   input);
+}
+
+template <typename T>
+void MulByBitCodeGradWeight(size_t num_classes, const framework::Tensor& codes,
+                            const framework::Tensor& tmat,
+                            framework::Tensor& weight,
+                            const framework::Tensor& input) {
+  auto op = [](const T t, T* weight_row, const T* input_row, size_t input_dim) {
+    for (size_t k = 0; k < input_dim; ++k) {
+      weight_row[k] += t * input_row[k];
+    }
+  };
+  MulByBitCodeT<T>(op, SimpleCodeTable(num_classes), codes, tmat, weight,
+                   input);
 }
+
+template <typename T>
+void MulByBitCodeGradError(size_t num_classes, const framework::Tensor& codes,
+                           const framework::Tensor& tmat,
+                           const framework::Tensor& weight,
+                           framework::Tensor& input) {
+  auto op = [](const T t, const T* weight_row, T* input_row, size_t input_dim) {
+    for (size_t k = 0; k < input_dim; ++k) {
+      input_row[k] += t * weight_row[k];
+    }
+  };
+  MulByBitCodeT<T>(op, SimpleCodeTable(num_classes), codes, tmat, weight,
+                   input);
+}
+
+template <class CodeTable, typename T>
+void SubByBitCodeT(CodeTable code_table, const framework::Tensor& codes,
+                   framework::Tensor& tmat) {
+  size_t max_code_length = code_table.get_max_code_length();
+  size_t num_samples = tmat.dims()[0];
+  size_t o_width = tmat.dims()[1];
+  for (size_t i = 0; i < num_samples; ++i) {
+    auto code = code_table(codes.data<T>()[i]);
+    int code_length = code.get_length();
+    for (int j = 0; j < code_length; ++j) {
+      if (code.calc_bit(j)) {
+        tmat.data<T>()[i * o_width + j] -= 1;
+      }
+    }
+  }
+}
+
+template <typename T>
+void SubByBitCode(size_t num_classes, const framework::Tensor& codes,
+                  framework::Tensor& tmat) {
+  SubByBitCodeT<T>(SimpleCodeTable(num_classes), codes, tmat);
+}
+
 }  // namespace math
 }  // namespace operators
 }  // namespace paddle

paddle/operators/math/matrix_bit_code.h

@@ -59,27 +59,57 @@ struct SimpleCodeTable {
   int max_code_length_;
 };
 
-/* For j < codeLength
+/* For j < code_length
     tmat(i, j) += vec(0, index(i, j))
 */
 template <typename T>
 void AddByBitCode(size_t num_classes, const framework::Tensor& codes,
                   framework::Tensor& tmat, const framework::Tensor& vec);
 
-/* For j < codeLength
+/* For j < code_length
+    vec(0, index(i, j)) += tmat(i, j)
+*/
+template <typename T>
+void AddByBitCodeGrad(size_t num_classes, const framework::Tensor& codes,
+                      const framework::Tensor& tmat, framework::Tensor& vec);
+/* For j < code_length
     sum(i, 0) = \sum_j bit(i, j) * tmat(i, j)
 */
 template <typename T>
 void SumByBitCode(size_t num_classes, const framework::Tensor& codes,
                   framework::Tensor& tmat, framework::Tensor& sum, T scale_sum);
 
-/* For j < codeLength
+/* For j < code_length
     input.row(i) += tmat(i, j) * weight.row(index(i, j))
 */
 template <typename T>
 void MulByBitCode(size_t num_classes, const framework::Tensor& codes,
                   framework::Tensor& tmat, const framework::Tensor& weight,
                   const framework::Tensor& input);
+
+/* For index(i, j) >= 0:
+    weight.row(index(i, j)) += tmat(i, j) * input.row(i)
+*/
+template <typename T>
+void MulByBitCodeGradWeight(size_t num_classes, const framework::Tensor& codes,
+                            const framework::Tensor& tmat,
+                            framework::Tensor& weight,
+                            const framework::Tensor& input);
+/* For j < code_length
+  input.row(i) += tmat(i, j) * weight.row(index(i, j))
+*/
+template <typename T>
+void MulByBitCodeGradError(size_t num_classes, const framework::Tensor& codes,
+                           const framework::Tensor& tmat,
+                           const framework::Tensor& weight,
+                           framework::Tensor& input);
+
+/* For j < code_length
+    tmat(i, j) -= bit(i, j)
+*/
+template <typename T>
+void SubByBitCode(size_t num_classes, const framework::Tensor& codes,
+                  framework::Tensor& tmat);
 }  // namespace math
 }  // namespace operators
 }  // namespace paddle