/* Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved. 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 #include "paddle/fluid/framework/op_registry.h" #include "paddle/fluid/memory/memcpy.h" #include "paddle/fluid/operators/math/sequence_padding.h" #include "paddle/pten/kernels/funcs/math_function.h" namespace paddle { namespace operators { using LoDTensor = framework::LoDTensor; using LoD = framework::LoD; template class SequenceUnpadOpKernel : public framework::OpKernel { public: void Compute(const framework::ExecutionContext& ctx) const override { auto* x_t = ctx.Input("X"); auto* len_t = ctx.Input("Length"); auto* out_t = ctx.Output("Out"); auto& dev_ctx = ctx.template device_context(); framework::Tensor seq_len_cpu = ctx.AllocateTmpTensor(len_t->dims(), dev_ctx); if (platform::is_gpu_place(ctx.GetPlace())) { seq_len_cpu.mutable_data(platform::CPUPlace()); framework::TensorCopySync(*len_t, platform::CPUPlace(), &seq_len_cpu); } else { seq_len_cpu = *len_t; } const int64_t* seq_len_ptr = seq_len_cpu.data(); int64_t batch_size = len_t->dims()[0]; std::vector out_lod0(batch_size + 1, 0); for (int64_t i = 0; i < batch_size; ++i) { out_lod0[i + 1] = out_lod0[i] + static_cast(seq_len_ptr[i]); } framework::LoD out_lod; out_lod.push_back(out_lod0); out_t->set_lod(out_lod); std::vector out_dims_vec{static_cast(out_lod0.back())}; if (x_t->dims().size() == 2) { out_dims_vec.push_back(1); } else { for (int i = 2; i < x_t->dims().size(); ++i) { out_dims_vec.push_back(x_t->dims()[i]); } } out_t->Resize(framework::make_ddim(out_dims_vec)); // after set the lod of output, allocate the memory out_t->mutable_data(ctx.GetPlace()); int64_t padded_length = x_t->dims()[1]; math::UnpaddingLoDTensorFunctor()( dev_ctx, *x_t, out_t, padded_length, 0, false, math::kBatchLengthWidth); } }; template class SequenceUnpadGradOpKernel : public framework::OpKernel { public: void Compute(const framework::ExecutionContext& ctx) const override { auto* d_x = ctx.Output(framework::GradVarName("X")); if (d_x) { const auto* d_out = ctx.Input(framework::GradVarName("Out")); d_x->mutable_data(ctx.GetPlace()); int padded_length = d_x->dims()[1]; LoDTensor zero_pads; zero_pads.Resize({1, 1}); zero_pads.mutable_data(ctx.GetPlace()); pten::funcs::SetConstant set_zero; auto& dev_ctx = ctx.template device_context(); set_zero(dev_ctx, &zero_pads, static_cast(0)); math::PaddingLoDTensorFunctor()( ctx.template device_context(), *d_out, d_x, zero_pads, padded_length, 0, false, math::kBatchLengthWidth); } } }; } // namespace operators } // namespace paddle