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80 lines
2.8 KiB
80 lines
2.8 KiB
/* Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#include "paddle/fluid/operators/gather_tree_op.h"
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namespace paddle {
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namespace operators {
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class GatherTreeOp : public framework::OperatorWithKernel {
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public:
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using framework::OperatorWithKernel::OperatorWithKernel;
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void InferShape(framework::InferShapeContext* ctx) const override {
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PADDLE_ENFORCE(ctx->HasInput("Ids"),
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"Input(Ids) of GatherTreeOp should not be null.");
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PADDLE_ENFORCE(ctx->HasInput("Parents"),
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"Input(Parents) of GatherTreeOp should not be null.");
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PADDLE_ENFORCE(ctx->HasOutput("Out"),
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"Output(Out) of GatherTreeOp should not be null.");
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auto ids_dims = ctx->GetInputDim("Ids");
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auto parents_dims = ctx->GetInputDim("Parents");
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PADDLE_ENFORCE(ids_dims == parents_dims,
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"The shape of Input(Parents) must be same with the shape of "
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"Input(Ids).");
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ctx->SetOutputDim("Out", ids_dims);
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}
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protected:
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framework::OpKernelType GetExpectedKernelType(
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const framework::ExecutionContext& ctx) const override {
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return framework::OpKernelType(
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OperatorWithKernel::IndicateVarDataType(ctx, "Ids"),
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ctx.device_context());
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}
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};
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class GatherTreeOpMaker : public framework::OpProtoAndCheckerMaker {
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public:
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void Make() override {
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AddInput("Ids",
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"The Tensor with shape [length, batch_size, beam_size] containing "
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"the selected ids of all time steps.");
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AddInput("Parents",
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"The Tensor has the same shape as Ids and contains the parents "
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"corresponding to selected ids when searching among beams.");
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AddOutput(
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"Out",
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"A Tensor with shape [length, batch_size, beam_size] containing the "
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"full sequences. The sequences is collected by backtracing from the "
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"last time step of Ids.");
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AddComment(R"DOC(
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GatherTree Operator.
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Backtrace from the last time step and generate the full sequences by collecting beam search
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selected ids.
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)DOC");
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}
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};
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} // namespace operators
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} // namespace paddle
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namespace ops = paddle::operators;
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REGISTER_OPERATOR(gather_tree, ops::GatherTreeOp, ops::GatherTreeOpMaker);
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REGISTER_OP_CPU_KERNEL(gather_tree, ops::GatherTreeOpKernel<int32_t>,
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ops::GatherTreeOpKernel<int64_t>);
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