Add sequence slice operator

paddle/operators/sequence_slice_op.cc

@@ -0,0 +1,132 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/operators/sequence_slice_op.h"
+
+namespace paddle {
+namespace operators {
+
+class SequenceSliceOp : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext* ctx) const override {
+    PADDLE_ENFORCE(ctx->HasInput("X"),
+                   "Input(X) of SequenceSliceOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasInput("Offset"),
+                   "Input(Offset) of SequenceSliceOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasInput("Length"),
+                   "Input(Length) of SequenceSliceOp should not be null.");
+    PADDLE_ENFORCE(ctx->HasOutput("Out"),
+                   "Output(Out) of SequenceSliceOp should not be null.");
+    auto input_dims = ctx->GetInputDim("X");
+
+    auto offset_dim = ctx->GetInputDim("Offset");
+    auto length_dim = ctx->GetInputDim("Length");
+
+    PADDLE_ENFORCE_EQ(
+        offset_dim.size(), 2UL,
+        "Only support one level sequence now, The rank of offset must be 2.");
+    PADDLE_ENFORCE_EQ(
+        length_dim.size(), 2UL,
+        "Only support one level sequence now, The rank of Length must be 2.");
+
+    // Initialize the output's dims to maximum,
+    // and re-set to real dims by the value of Offset and Length at kernel
+    ctx->SetOutputDim("Out", input_dims);
+    }
+
+ protected:
+  framework::OpKernelType GetKernelType(
+      const framework::ExecutionContext& ctx) const override {
+    return framework::OpKernelType(
+        framework::ToDataType(ctx.Input<framework::LoDTensor>("X")->type()),
+        ctx.device_context());
+  }
+};
+
+class SequenceSliceGradOp : public framework::OperatorWithKernel {
+ public:
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext* ctx) const override {
+    PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Out")),
+                   "The gradient of Out should not be null.");
+    PADDLE_ENFORCE(ctx->HasOutputs(framework::GradVarName("X")),
+                   "The gradient of X should not be null.");
+    ctx->SetOutputsDim(framework::GradVarName("X"), ctx->GetInputsDim("X"));
+  }
+
+ protected:
+  framework::OpKernelType GetKernelType(
+      const framework::ExecutionContext& ctx) const override {
+    return framework::OpKernelType(
+        framework::ToDataType(ctx.Input<framework::LoDTensor>("X")->type()),
+        ctx.device_context());
+  }
+};
+
+class SequenceSliceOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  SequenceSliceOpMaker(framework::OpProto* proto,
+                       framework::OpAttrChecker* op_checker)
+      : OpProtoAndCheckerMaker(proto, op_checker) {
+    AddInput("X",
+             "(LoDTensor), "
+             "the input of SequenceSliceOp.");
+    AddInput("Offset",
+             "(Tensor), "
+             "a vector<int> to describe the offset of every input sequence for "
+             "sub sequence item.");
+    AddInput("Length",
+             "(Tensor), "
+             "a vector<int> to describe the length of every input sequence for "
+             "sub sequence item.");
+    AddOutput("Out",
+              "(LoDTensor), the output of SequenceSliceOp.");
+    AddComment(R"DOC(
+Sequence slice operator
+
+The operator crops a subsequence from given sequence with given start offset and subsequence length.
+It only supports sequence (LoD Tensor with level number is 1).
+- Case:
+    X = [[a1, a2;
+        b1, b2;
+        c1, c2]
+       [d1, d2;
+        e1, e2]]
+    LoD(X) = {{0, 3, 5}}; Dims(X) = (5, 2)
+    Offset = [[0], [1]]; Length = [[2], [1]]
+
+    Out = [[a1, a2;
+            b1, b2]
+            [e1, e2]]
+    LoD(Out) = {{0, 2, 3}}; Dims(Out) = (3, 2)
+NOTE: The first dimension size of input, the size of offset and Length, should be equal. The offset start from 0.
+    )DOC");
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+REGISTER_OP(sequence_slice, ops::SequenceSliceOp, ops::SequenceSliceOpMaker,
+            sequence_slice_grad, ops::SequenceSliceGradOp);
+REGISTER_OP_CPU_KERNEL(
+    sequence_slice,
+    ops::SequenceSliceOpKernel<paddle::platform::CPUPlace, float>);
+REGISTER_OP_CPU_KERNEL(
+    sequence_slice_grad,
+    ops::SequenceSliceGradOpKernel<paddle::platform::CPUPlace, float>);

paddle/operators/sequence_slice_op.cu

@@ -0,0 +1,23 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#include "paddle/operators/sequence_slice_op.h"
+
+namespace ops = paddle::operators;
+REGISTER_OP_GPU_KERNEL(
+    sequence_slice,
+    ops::SequenceSliceOpKernel<paddle::platform::GPUPlace, float>);
+REGISTER_OP_GPU_KERNEL(
+    sequence_slice_grad,
+    ops::SequenceSliceGradOpKernel<paddle::platform::GPUPlace, float>);

paddle/operators/sequence_slice_op.h

@@ -0,0 +1,173 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License. */
+
+#pragma once
+#include "paddle/framework/op_registry.h"
+#include "paddle/operators/math/math_function.h"
+#include "paddle/operators/strided_memcpy.h"
+
+namespace paddle {
+namespace operators {
+
+using Tensor = framework::Tensor;
+using LoDTensor = framework::LoDTensor;
+using LoD = framework::LoD;
+
+template <typename T>
+inline LoD SequenceSliceLoD(const T& in, const int64_t* offset_data,
+                           const int64_t* length_data) {
+  auto out_lod = in.lod();
+  size_t lod_offset = 0;
+
+  auto n = in.lod()[0].size() - 1;
+  out_lod[0][0] = 0;
+  for (size_t i = 0; i < n; ++i) {
+    lod_offset += length_data[i];
+    out_lod[0][i+1] = lod_offset;
+  }
+  return out_lod;
+}
+
+template <typename Place, typename T>
+class SequenceSliceOpKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* in = ctx.Input<LoDTensor>("X");
+    auto* offset = ctx.Input<Tensor>("Offset");
+    auto* length = ctx.Input<Tensor>("Length");
+    auto* out = ctx.Output<LoDTensor>("Out");
+
+    auto lod = in->lod();
+    auto n = lod[0].size() - 1;
+
+    PADDLE_ENFORCE_EQ(lod.size(), 1UL,
+                      "Only support one level sequence now.");
+    PADDLE_ENFORCE_EQ(
+        n, static_cast<size_t>(length->dims()[0]),
+        "The size of input-sequence and length-array should be the same")
+    PADDLE_ENFORCE_EQ(
+        n, static_cast<size_t>(offset->dims()[0]),
+        "The size of input-sequence and offset-array should be the same")
+
+    const int64_t* offset_data = offset->data<int64_t>();
+    const int64_t* length_data = length->data<int64_t>();
+    framework::Tensor offset_cpu;
+    framework::Tensor length_cpu;
+
+    if (platform::is_gpu_place(ctx.GetPlace())) {
+      offset_cpu.mutable_data<T>(offset->dims(), platform::CPUPlace());
+      offset_cpu.CopyFrom(*offset, platform::CPUPlace(), ctx.device_context());
+      offset_data = offset_cpu.data<int64_t>();
+
+      length_cpu.mutable_data<T>(length->dims(), platform::CPUPlace());
+      length_cpu.CopyFrom(*length, platform::CPUPlace(), ctx.device_context());
+      length_data = length_cpu.data<int64_t>();
+    }
+
+    for (size_t i = 0; i < n; ++i) {
+      PADDLE_ENFORCE_LT(0, offset_data[i],
+                "The offset[%d] must greater than zero.", i)
+      PADDLE_ENFORCE_LT(0, length_data[i],
+                "The length[%d] must greater than zero.", i)
+      PADDLE_ENFORCE_LT(
+          lod[0][i] + offset_data[i] + length_data[i],
+          lod[0][i + 1],
+          "The target tensor's length overflow.")
+    }
+
+    out->mutable_data<T>(ctx.GetPlace());
+    auto out_lod = SequenceSliceLoD(*in, offset_data, length_data);
+    auto out_dims = in->dims();
+    out_dims[0] = out_lod[0][out_lod[0].size() - 1];
+    out->Resize(out_dims);
+    out->set_lod(out_lod);
+
+    auto in_stride = framework::stride(in->dims());
+    auto out_stride = framework::stride(out->dims());
+
+    size_t out_offset = 0;
+    for (size_t i = 0; i < n; ++i) {
+      Tensor in_t =
+          in->Slice(static_cast<int>(lod[0][i] + offset_data[i]),
+                    static_cast<int>(lod[0][i] + offset_data[i] +
+                                     length_data[i]));
+
+      StridedMemcpy<T>(ctx.device_context(), in_t.data<T>(),
+                       in_stride, in_t.dims(), out_stride,
+                       out->data<T>() + out_offset);
+      out_offset += length_data[i] * in_stride[0];
+    }
+  }
+};
+
+template <typename Place, typename T>
+class SequenceSliceGradOpKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* in = ctx.Input<LoDTensor>("X");
+    auto* offset = ctx.Input<Tensor>("Offset");
+    auto* length = ctx.Input<Tensor>("Length");
+    auto* out_grad =
+        ctx.Input<framework::LoDTensor>(framework::GradVarName("Out"));
+    auto* x_grad =
+        ctx.Output<framework::LoDTensor>(framework::GradVarName("X"));
+
+    const int64_t* offset_data = offset->data<int64_t>();
+    const int64_t* length_data = length->data<int64_t>();
+    framework::Tensor offset_cpu;
+    framework::Tensor length_cpu;
+
+    if (platform::is_gpu_place(ctx.GetPlace())) {
+      offset_cpu.mutable_data<T>(offset->dims(), platform::CPUPlace());
+      offset_cpu.CopyFrom(*offset, platform::CPUPlace(), ctx.device_context());
+      offset_data = offset_cpu.data<int64_t>();
+
+      length_cpu.mutable_data<T>(length->dims(), platform::CPUPlace());
+      length_cpu.CopyFrom(*length, platform::CPUPlace(), ctx.device_context());
+      length_data = length_cpu.data<int64_t>();
+    }
+
+    auto lod = in->lod();
+    auto out_lod = out_grad->lod();
+
+    if (x_grad) {
+      x_grad->mutable_data<T>(ctx.GetPlace());
+      x_grad->set_lod(in->lod());
+      math::SetConstant<Place, T> set_zero;
+      set_zero(ctx.device_context(), x_grad, static_cast<T>(0));
+
+      auto out_grad_stride = framework::stride(out_grad->dims());
+
+      for (size_t i = 0; i < out_lod[0].size() - 1; ++i) {
+        Tensor out_grad_t =
+            out_grad->Slice(static_cast<int>(out_lod[0][i]),
+                            static_cast<int>(out_lod[0][i + 1]));
+        auto out_grad_stride = framework::stride(out_grad_t.dims());
+
+        auto x_grad_stride = framework::stride(x_grad->dims());
+
+        Tensor x_grad_t = x_grad->Slice(
+            static_cast<int>(lod[0][i] + offset_data[i]),
+            static_cast<int>(lod[0][i] + offset_data[i] + length_data[i]));
+
+        StridedMemcpy<T>(ctx.device_context(), out_grad_t.data<T>(),
+                        out_grad_stride, out_grad_t.dims(), x_grad_stride,
+                        x_grad_t.data<T>());
+      }
+    }
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle

python/paddle/v2/fluid/tests/test_sequence_slice_op.py

@@ -0,0 +1,45 @@
+import unittest
+import numpy as np
+import sys
+from op_test import OpTest
+
+class TestSequenceSliceOp(OpTest):
+    def set_data(self):
+        self.init_test_case()
+        # only supprot one level LoD
+        x = np.random.random(self.x_dim).astype('float32')
+        lod = self.x_lod
+        offset = np.array(self.offset).astype("int64")
+        length = np.array(self.length).astype("int64")
+
+        self.inputs = {'X': (x, lod), 'Offset': offset, 'Length': length}
+        outs = [] #np.zeros((100, 3, 2)).astype('float32')
+        out_lod = [[0]]
+        out_lod_offset = 0
+        for i in range(len(offset)):
+            sub_x = x[lod[0][i] + offset[i, 0]: lod[0]
+                      [i] + offset[i, 0] + length[i, 0], :]
+            out_lod_offset = out_lod_offset + len(sub_x)
+            outs.append(sub_x)
+            out_lod[0].append(out_lod_offset)
+        outs = np.concatenate(outs, axis=0)
+        self.outputs = {'Out': (outs, out_lod)}
+
+    def init_test_case(self):
+        self.x_dim = (100, 3, 2)
+        self.x_lod = [[0, 20, 40, 60, 80, 100]]
+        self.offset = [[1], [2], [3], [4], [5]]
+        self.length = [[10], [8], [6], [4], [2]]
+
+    def setUp(self):
+        self.op_type = "sequence_slice"
+        self.set_data()
+
+    def test_check_output(self):
+        self.check_output()
+
+    def test_check_grad(self):
+        self.check_grad(['X'], 'Out')
+
+if __name__ == '__main__':
+    unittest.main()